diff --git a/.gitattributes b/.gitattributes
index 4b32eaa9571e64e47b51c43537063f56b204d8b3..c9ba5bfc403600a8c9418fd4503574bcb69dc87e 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,4 +1,4 @@
-*.c diff=cpp
-*.h diff=cpp
-*.dtsi diff=dts
-*.dts diff=dts
+# SPDX-License-Identifier: GPL-2.0-only
+*.[ch] diff=cpp
+*.dts diff=dts
+*.dts[io] diff=dts
diff --git a/.gitignore b/.gitignore
index 20dce5c3b9e0f2c124db43c2620c8c1dc0404569..8fe465f251c0368f7d66ba687aa4c5cbbfaf1b76 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,7 +4,7 @@
# subdirectories here. Add them in the ".gitignore" file
# in that subdirectory instead.
#
-# NOTE! Please use 'git ls-files -i --exclude-standard'
+# NOTE! Please use 'git ls-files -i -c --exclude-per-directory=.gitignore'
# command after changing this file, to see if there are
# any tracked files which get ignored after the change.
#
@@ -16,6 +16,7 @@
*.bin
*.bz2
*.c.[012]*.*
+*.cover
*.dt.yaml
*.dtb
*.dtbo
@@ -33,6 +34,7 @@
*.lz4
*.lzma
*.lzo
+*.mbx
*.mod
*.mod.c
*.o
diff --git a/Documentation/Makefile b/Documentation/Makefile
index bb73dcb5ed0536e169ff6427b678a7e5a5d8cffb..023fa658a0a878f749be6ddc609c92246ebe6e92 100644
--- a/Documentation/Makefile
+++ b/Documentation/Makefile
@@ -28,7 +28,7 @@ BUILDDIR = $(obj)/output
PDFLATEX = xelatex
LATEXOPTS = -interaction=batchmode -no-shell-escape
-ifeq ($(KBUILD_VERBOSE),0)
+ifeq ($(findstring 1, $(KBUILD_VERBOSE)),)
SPHINXOPTS += "-q"
endif
diff --git a/Documentation/dontdiff b/Documentation/dontdiff
index 352ff53a2306ad897f5ef3e20ade4ca27f664471..3c399f132e2db0a0f4bdd9ffc1f4ce63030570c7 100644
--- a/Documentation/dontdiff
+++ b/Documentation/dontdiff
@@ -91,7 +91,6 @@ asm_offsets.h
autoconf.h*
av_permissions.h
bbootsect
-bin2c
binkernel.spec
bootsect
bounds.h
diff --git a/Documentation/kbuild/llvm.rst b/Documentation/kbuild/llvm.rst
index 6b2bac8e9ce0885fbd1b43465ef3e390456093e4..bfb51685073cb6c5dd09d2617d15912b49573ce9 100644
--- a/Documentation/kbuild/llvm.rst
+++ b/Documentation/kbuild/llvm.rst
@@ -15,12 +15,15 @@ such as GCC and binutils. Ongoing work has allowed for `Clang
<https://clang.llvm.org/>`_ and `LLVM <https://llvm.org/>`_ utilities to be
used as viable substitutes. Distributions such as `Android
<https://www.android.com/>`_, `ChromeOS
-<https://www.chromium.org/chromium-os>`_, and `OpenMandriva
-<https://www.openmandriva.org/>`_ use Clang built kernels. `LLVM is a
-collection of toolchain components implemented in terms of C++ objects
-<https://www.aosabook.org/en/llvm.html>`_. Clang is a front-end to LLVM that
-supports C and the GNU C extensions required by the kernel, and is pronounced
-"klang," not "see-lang."
+<https://www.chromium.org/chromium-os>`_, `OpenMandriva
+<https://www.openmandriva.org/>`_, and `Chimera Linux
+<https://chimera-linux.org/>`_ use Clang built kernels. Google's and Meta's
+datacenter fleets also run kernels built with Clang.
+
+`LLVM is a collection of toolchain components implemented in terms of C++
+objects <https://www.aosabook.org/en/llvm.html>`_. Clang is a front-end to LLVM
+that supports C and the GNU C extensions required by the kernel, and is
+pronounced "klang," not "see-lang."
Clang
-----
diff --git a/Documentation/kbuild/makefiles.rst b/Documentation/kbuild/makefiles.rst
index 38bc74eaa547403935a2ae645cb0ec875a1a0279..e67eb261c9b0ae9e647bf61e9375405dc2e025da 100644
--- a/Documentation/kbuild/makefiles.rst
+++ b/Documentation/kbuild/makefiles.rst
@@ -4,69 +4,8 @@ Linux Kernel Makefiles
This document describes the Linux kernel Makefiles.
-.. Table of Contents
-
- === 1 Overview
- === 2 Who does what
- === 3 The kbuild files
- --- 3.1 Goal definitions
- --- 3.2 Built-in object goals - obj-y
- --- 3.3 Loadable module goals - obj-m
- --- 3.4 <deleted>
- --- 3.5 Library file goals - lib-y
- --- 3.6 Descending down in directories
- --- 3.7 Non-builtin vmlinux targets - extra-y
- --- 3.8 Always built goals - always-y
- --- 3.9 Compilation flags
- --- 3.10 Dependency tracking
- --- 3.11 Custom Rules
- --- 3.12 Command change detection
- --- 3.13 $(CC) support functions
- --- 3.14 $(LD) support functions
- --- 3.15 Script Invocation
-
- === 4 Host Program support
- --- 4.1 Simple Host Program
- --- 4.2 Composite Host Programs
- --- 4.3 Using C++ for host programs
- --- 4.4 Using Rust for host programs
- --- 4.5 Controlling compiler options for host programs
- --- 4.6 When host programs are actually built
-
- === 5 Userspace Program support
- --- 5.1 Simple Userspace Program
- --- 5.2 Composite Userspace Programs
- --- 5.3 Controlling compiler options for userspace programs
- --- 5.4 When userspace programs are actually built
-
- === 6 Kbuild clean infrastructure
-
- === 7 Architecture Makefiles
- --- 7.1 Set variables to tweak the build to the architecture
- --- 7.2 Add prerequisites to archheaders
- --- 7.3 Add prerequisites to archprepare
- --- 7.4 List directories to visit when descending
- --- 7.5 Architecture-specific boot images
- --- 7.6 Building non-kbuild targets
- --- 7.7 Commands useful for building a boot image
- --- 7.8 <deleted>
- --- 7.9 Preprocessing linker scripts
- --- 7.10 Generic header files
- --- 7.11 Post-link pass
-
- === 8 Kbuild syntax for exported headers
- --- 8.1 no-export-headers
- --- 8.2 generic-y
- --- 8.3 generated-y
- --- 8.4 mandatory-y
-
- === 9 Kbuild Variables
- === 10 Makefile language
- === 11 Credits
- === 12 TODO
-
-1 Overview
-==========
+Overview
+========
The Makefiles have five parts::
@@ -83,6 +22,7 @@ The top Makefile is responsible for building two major products: vmlinux
(the resident kernel image) and modules (any module files).
It builds these goals by recursively descending into the subdirectories of
the kernel source tree.
+
The list of subdirectories which are visited depends upon the kernel
configuration. The top Makefile textually includes an arch Makefile
with the name arch/$(SRCARCH)/Makefile. The arch Makefile supplies
@@ -96,14 +36,13 @@ any built-in or modular targets.
scripts/Makefile.* contains all the definitions/rules etc. that
are used to build the kernel based on the kbuild makefiles.
-
-2 Who does what
-===============
+Who does what
+=============
People have four different relationships with the kernel Makefiles.
*Users* are people who build kernels. These people type commands such as
-"make menuconfig" or "make". They usually do not read or edit
+``make menuconfig`` or ``make``. They usually do not read or edit
any kernel Makefiles (or any other source files).
*Normal developers* are people who work on features such as device
@@ -123,1402 +62,1429 @@ These people need to know about all aspects of the kernel Makefiles.
This document is aimed towards normal developers and arch developers.
-3 The kbuild files
-==================
+The kbuild files
+================
Most Makefiles within the kernel are kbuild Makefiles that use the
kbuild infrastructure. This chapter introduces the syntax used in the
kbuild makefiles.
-The preferred name for the kbuild files are 'Makefile' but 'Kbuild' can
-be used and if both a 'Makefile' and a 'Kbuild' file exists, then the 'Kbuild'
+
+The preferred name for the kbuild files are ``Makefile`` but ``Kbuild`` can
+be used and if both a ``Makefile`` and a ``Kbuild`` file exists, then the ``Kbuild``
file will be used.
-Section 3.1 "Goal definitions" is a quick intro; further chapters provide
+Section `Goal definitions`_ is a quick intro; further chapters provide
more details, with real examples.
-3.1 Goal definitions
---------------------
+Goal definitions
+----------------
- Goal definitions are the main part (heart) of the kbuild Makefile.
- These lines define the files to be built, any special compilation
- options, and any subdirectories to be entered recursively.
+Goal definitions are the main part (heart) of the kbuild Makefile.
+These lines define the files to be built, any special compilation
+options, and any subdirectories to be entered recursively.
- The most simple kbuild makefile contains one line:
+The most simple kbuild makefile contains one line:
- Example::
+Example::
- obj-y += foo.o
+ obj-y += foo.o
- This tells kbuild that there is one object in that directory, named
- foo.o. foo.o will be built from foo.c or foo.S.
+This tells kbuild that there is one object in that directory, named
+foo.o. foo.o will be built from foo.c or foo.S.
- If foo.o shall be built as a module, the variable obj-m is used.
- Therefore the following pattern is often used:
+If foo.o shall be built as a module, the variable obj-m is used.
+Therefore the following pattern is often used:
- Example::
+Example::
- obj-$(CONFIG_FOO) += foo.o
+ obj-$(CONFIG_FOO) += foo.o
- $(CONFIG_FOO) evaluates to either y (for built-in) or m (for module).
- If CONFIG_FOO is neither y nor m, then the file will not be compiled
- nor linked.
+$(CONFIG_FOO) evaluates to either y (for built-in) or m (for module).
+If CONFIG_FOO is neither y nor m, then the file will not be compiled
+nor linked.
-3.2 Built-in object goals - obj-y
----------------------------------
+Built-in object goals - obj-y
+-----------------------------
- The kbuild Makefile specifies object files for vmlinux
- in the $(obj-y) lists. These lists depend on the kernel
- configuration.
+The kbuild Makefile specifies object files for vmlinux
+in the $(obj-y) lists. These lists depend on the kernel
+configuration.
- Kbuild compiles all the $(obj-y) files. It then calls
- "$(AR) rcSTP" to merge these files into one built-in.a file.
- This is a thin archive without a symbol table. It will be later
- linked into vmlinux by scripts/link-vmlinux.sh
+Kbuild compiles all the $(obj-y) files. It then calls
+``$(AR) rcSTP`` to merge these files into one built-in.a file.
+This is a thin archive without a symbol table. It will be later
+linked into vmlinux by scripts/link-vmlinux.sh
- The order of files in $(obj-y) is significant. Duplicates in
- the lists are allowed: the first instance will be linked into
- built-in.a and succeeding instances will be ignored.
+The order of files in $(obj-y) is significant. Duplicates in
+the lists are allowed: the first instance will be linked into
+built-in.a and succeeding instances will be ignored.
- Link order is significant, because certain functions
- (module_init() / __initcall) will be called during boot in the
- order they appear. So keep in mind that changing the link
- order may e.g. change the order in which your SCSI
- controllers are detected, and thus your disks are renumbered.
+Link order is significant, because certain functions
+(module_init() / __initcall) will be called during boot in the
+order they appear. So keep in mind that changing the link
+order may e.g. change the order in which your SCSI
+controllers are detected, and thus your disks are renumbered.
- Example::
+Example::
- #drivers/isdn/i4l/Makefile
- # Makefile for the kernel ISDN subsystem and device drivers.
- # Each configuration option enables a list of files.
- obj-$(CONFIG_ISDN_I4L) += isdn.o
- obj-$(CONFIG_ISDN_PPP_BSDCOMP) += isdn_bsdcomp.o
+ #drivers/isdn/i4l/Makefile
+ # Makefile for the kernel ISDN subsystem and device drivers.
+ # Each configuration option enables a list of files.
+ obj-$(CONFIG_ISDN_I4L) += isdn.o
+ obj-$(CONFIG_ISDN_PPP_BSDCOMP) += isdn_bsdcomp.o
-3.3 Loadable module goals - obj-m
----------------------------------
+Loadable module goals - obj-m
+-----------------------------
- $(obj-m) specifies object files which are built as loadable
- kernel modules.
+$(obj-m) specifies object files which are built as loadable
+kernel modules.
- A module may be built from one source file or several source
- files. In the case of one source file, the kbuild makefile
- simply adds the file to $(obj-m).
+A module may be built from one source file or several source
+files. In the case of one source file, the kbuild makefile
+simply adds the file to $(obj-m).
- Example::
+Example::
- #drivers/isdn/i4l/Makefile
- obj-$(CONFIG_ISDN_PPP_BSDCOMP) += isdn_bsdcomp.o
+ #drivers/isdn/i4l/Makefile
+ obj-$(CONFIG_ISDN_PPP_BSDCOMP) += isdn_bsdcomp.o
- Note: In this example $(CONFIG_ISDN_PPP_BSDCOMP) evaluates to 'm'
+Note: In this example $(CONFIG_ISDN_PPP_BSDCOMP) evaluates to "m"
- If a kernel module is built from several source files, you specify
- that you want to build a module in the same way as above; however,
- kbuild needs to know which object files you want to build your
- module from, so you have to tell it by setting a $(<module_name>-y)
- variable.
+If a kernel module is built from several source files, you specify
+that you want to build a module in the same way as above; however,
+kbuild needs to know which object files you want to build your
+module from, so you have to tell it by setting a $(<module_name>-y)
+variable.
- Example::
+Example::
- #drivers/isdn/i4l/Makefile
- obj-$(CONFIG_ISDN_I4L) += isdn.o
- isdn-y := isdn_net_lib.o isdn_v110.o isdn_common.o
+ #drivers/isdn/i4l/Makefile
+ obj-$(CONFIG_ISDN_I4L) += isdn.o
+ isdn-y := isdn_net_lib.o isdn_v110.o isdn_common.o
- In this example, the module name will be isdn.o. Kbuild will
- compile the objects listed in $(isdn-y) and then run
- "$(LD) -r" on the list of these files to generate isdn.o.
+In this example, the module name will be isdn.o. Kbuild will
+compile the objects listed in $(isdn-y) and then run
+``$(LD) -r`` on the list of these files to generate isdn.o.
- Due to kbuild recognizing $(<module_name>-y) for composite objects,
- you can use the value of a `CONFIG_` symbol to optionally include an
- object file as part of a composite object.
+Due to kbuild recognizing $(<module_name>-y) for composite objects,
+you can use the value of a ``CONFIG_`` symbol to optionally include an
+object file as part of a composite object.
- Example::
+Example::
- #fs/ext2/Makefile
- obj-$(CONFIG_EXT2_FS) += ext2.o
- ext2-y := balloc.o dir.o file.o ialloc.o inode.o ioctl.o \
- namei.o super.o symlink.o
- ext2-$(CONFIG_EXT2_FS_XATTR) += xattr.o xattr_user.o \
- xattr_trusted.o
+ #fs/ext2/Makefile
+ obj-$(CONFIG_EXT2_FS) += ext2.o
+ ext2-y := balloc.o dir.o file.o ialloc.o inode.o ioctl.o \
+ namei.o super.o symlink.o
+ ext2-$(CONFIG_EXT2_FS_XATTR) += xattr.o xattr_user.o \
+ xattr_trusted.o
- In this example, xattr.o, xattr_user.o and xattr_trusted.o are only
- part of the composite object ext2.o if $(CONFIG_EXT2_FS_XATTR)
- evaluates to 'y'.
+In this example, xattr.o, xattr_user.o and xattr_trusted.o are only
+part of the composite object ext2.o if $(CONFIG_EXT2_FS_XATTR)
+evaluates to "y".
- Note: Of course, when you are building objects into the kernel,
- the syntax above will also work. So, if you have CONFIG_EXT2_FS=y,
- kbuild will build an ext2.o file for you out of the individual
- parts and then link this into built-in.a, as you would expect.
+Note: Of course, when you are building objects into the kernel,
+the syntax above will also work. So, if you have CONFIG_EXT2_FS=y,
+kbuild will build an ext2.o file for you out of the individual
+parts and then link this into built-in.a, as you would expect.
-3.5 Library file goals - lib-y
-------------------------------
+Library file goals - lib-y
+--------------------------
- Objects listed with obj-* are used for modules, or
- combined in a built-in.a for that specific directory.
- There is also the possibility to list objects that will
- be included in a library, lib.a.
- All objects listed with lib-y are combined in a single
- library for that directory.
- Objects that are listed in obj-y and additionally listed in
- lib-y will not be included in the library, since they will
- be accessible anyway.
- For consistency, objects listed in lib-m will be included in lib.a.
+Objects listed with obj-* are used for modules, or
+combined in a built-in.a for that specific directory.
+There is also the possibility to list objects that will
+be included in a library, lib.a.
+All objects listed with lib-y are combined in a single
+library for that directory.
+Objects that are listed in obj-y and additionally listed in
+lib-y will not be included in the library, since they will
+be accessible anyway.
+For consistency, objects listed in lib-m will be included in lib.a.
- Note that the same kbuild makefile may list files to be built-in
- and to be part of a library. Therefore the same directory
- may contain both a built-in.a and a lib.a file.
+Note that the same kbuild makefile may list files to be built-in
+and to be part of a library. Therefore the same directory
+may contain both a built-in.a and a lib.a file.
- Example::
+Example::
- #arch/x86/lib/Makefile
- lib-y := delay.o
+ #arch/x86/lib/Makefile
+ lib-y := delay.o
- This will create a library lib.a based on delay.o. For kbuild to
- actually recognize that there is a lib.a being built, the directory
- shall be listed in libs-y.
+This will create a library lib.a based on delay.o. For kbuild to
+actually recognize that there is a lib.a being built, the directory
+shall be listed in libs-y.
- See also "7.4 List directories to visit when descending".
+See also `List directories to visit when descending`_.
- Use of lib-y is normally restricted to `lib/` and `arch/*/lib`.
+Use of lib-y is normally restricted to ``lib/`` and ``arch/*/lib``.
-3.6 Descending down in directories
-----------------------------------
+Descending down in directories
+------------------------------
- A Makefile is only responsible for building objects in its own
- directory. Files in subdirectories should be taken care of by
- Makefiles in these subdirs. The build system will automatically
- invoke make recursively in subdirectories, provided you let it know of
- them.
+A Makefile is only responsible for building objects in its own
+directory. Files in subdirectories should be taken care of by
+Makefiles in these subdirs. The build system will automatically
+invoke make recursively in subdirectories, provided you let it know of
+them.
- To do so, obj-y and obj-m are used.
- ext2 lives in a separate directory, and the Makefile present in fs/
- tells kbuild to descend down using the following assignment.
+To do so, obj-y and obj-m are used.
+ext2 lives in a separate directory, and the Makefile present in fs/
+tells kbuild to descend down using the following assignment.
- Example::
+Example::
- #fs/Makefile
- obj-$(CONFIG_EXT2_FS) += ext2/
+ #fs/Makefile
+ obj-$(CONFIG_EXT2_FS) += ext2/
- If CONFIG_EXT2_FS is set to either 'y' (built-in) or 'm' (modular)
- the corresponding obj- variable will be set, and kbuild will descend
- down in the ext2 directory.
+If CONFIG_EXT2_FS is set to either "y" (built-in) or "m" (modular)
+the corresponding obj- variable will be set, and kbuild will descend
+down in the ext2 directory.
- Kbuild uses this information not only to decide that it needs to visit
- the directory, but also to decide whether or not to link objects from
- the directory into vmlinux.
+Kbuild uses this information not only to decide that it needs to visit
+the directory, but also to decide whether or not to link objects from
+the directory into vmlinux.
- When Kbuild descends into the directory with 'y', all built-in objects
- from that directory are combined into the built-in.a, which will be
- eventually linked into vmlinux.
+When Kbuild descends into the directory with "y", all built-in objects
+from that directory are combined into the built-in.a, which will be
+eventually linked into vmlinux.
- When Kbuild descends into the directory with 'm', in contrast, nothing
- from that directory will be linked into vmlinux. If the Makefile in
- that directory specifies obj-y, those objects will be left orphan.
- It is very likely a bug of the Makefile or of dependencies in Kconfig.
+When Kbuild descends into the directory with "m", in contrast, nothing
+from that directory will be linked into vmlinux. If the Makefile in
+that directory specifies obj-y, those objects will be left orphan.
+It is very likely a bug of the Makefile or of dependencies in Kconfig.
- Kbuild also supports dedicated syntax, subdir-y and subdir-m, for
- descending into subdirectories. It is a good fit when you know they
- do not contain kernel-space objects at all. A typical usage is to let
- Kbuild descend into subdirectories to build tools.
+Kbuild also supports dedicated syntax, subdir-y and subdir-m, for
+descending into subdirectories. It is a good fit when you know they
+do not contain kernel-space objects at all. A typical usage is to let
+Kbuild descend into subdirectories to build tools.
- Examples::
+Examples::
- # scripts/Makefile
- subdir-$(CONFIG_GCC_PLUGINS) += gcc-plugins
- subdir-$(CONFIG_MODVERSIONS) += genksyms
- subdir-$(CONFIG_SECURITY_SELINUX) += selinux
+ # scripts/Makefile
+ subdir-$(CONFIG_GCC_PLUGINS) += gcc-plugins
+ subdir-$(CONFIG_MODVERSIONS) += genksyms
+ subdir-$(CONFIG_SECURITY_SELINUX) += selinux
- Unlike obj-y/m, subdir-y/m does not need the trailing slash since this
- syntax is always used for directories.
+Unlike obj-y/m, subdir-y/m does not need the trailing slash since this
+syntax is always used for directories.
- It is good practice to use a `CONFIG_` variable when assigning directory
- names. This allows kbuild to totally skip the directory if the
- corresponding `CONFIG_` option is neither 'y' nor 'm'.
+It is good practice to use a ``CONFIG_`` variable when assigning directory
+names. This allows kbuild to totally skip the directory if the
+corresponding ``CONFIG_`` option is neither "y" nor "m".
-3.7 Non-builtin vmlinux targets - extra-y
------------------------------------------
+Non-builtin vmlinux targets - extra-y
+-------------------------------------
- extra-y specifies targets which are needed for building vmlinux,
- but not combined into built-in.a.
+extra-y specifies targets which are needed for building vmlinux,
+but not combined into built-in.a.
- Examples are:
+Examples are:
- 1) vmlinux linker script
+1) vmlinux linker script
- The linker script for vmlinux is located at
- arch/$(SRCARCH)/kernel/vmlinux.lds
+ The linker script for vmlinux is located at
+ arch/$(SRCARCH)/kernel/vmlinux.lds
- Example::
+Example::
- # arch/x86/kernel/Makefile
- extra-y += vmlinux.lds
+ # arch/x86/kernel/Makefile
+ extra-y += vmlinux.lds
- $(extra-y) should only contain targets needed for vmlinux.
+$(extra-y) should only contain targets needed for vmlinux.
- Kbuild skips extra-y when vmlinux is apparently not a final goal.
- (e.g. 'make modules', or building external modules)
+Kbuild skips extra-y when vmlinux is apparently not a final goal.
+(e.g. ``make modules``, or building external modules)
- If you intend to build targets unconditionally, always-y (explained
- in the next section) is the correct syntax to use.
+If you intend to build targets unconditionally, always-y (explained
+in the next section) is the correct syntax to use.
-3.8 Always built goals - always-y
----------------------------------
+Always built goals - always-y
+-----------------------------
- always-y specifies targets which are literally always built when
- Kbuild visits the Makefile.
+always-y specifies targets which are literally always built when
+Kbuild visits the Makefile.
- Example::
- # ./Kbuild
- offsets-file := include/generated/asm-offsets.h
- always-y += $(offsets-file)
+Example::
-3.9 Compilation flags
----------------------
+ # ./Kbuild
+ offsets-file := include/generated/asm-offsets.h
+ always-y += $(offsets-file)
- ccflags-y, asflags-y and ldflags-y
- These three flags apply only to the kbuild makefile in which they
- are assigned. They are used for all the normal cc, as and ld
- invocations happening during a recursive build.
- Note: Flags with the same behaviour were previously named:
- EXTRA_CFLAGS, EXTRA_AFLAGS and EXTRA_LDFLAGS.
- They are still supported but their usage is deprecated.
+Compilation flags
+-----------------
- ccflags-y specifies options for compiling with $(CC).
+ccflags-y, asflags-y and ldflags-y
+ These three flags apply only to the kbuild makefile in which they
+ are assigned. They are used for all the normal cc, as and ld
+ invocations happening during a recursive build.
+ Note: Flags with the same behaviour were previously named:
+ EXTRA_CFLAGS, EXTRA_AFLAGS and EXTRA_LDFLAGS.
+ They are still supported but their usage is deprecated.
- Example::
+ ccflags-y specifies options for compiling with $(CC).
- # drivers/acpi/acpica/Makefile
- ccflags-y := -Os -D_LINUX -DBUILDING_ACPICA
- ccflags-$(CONFIG_ACPI_DEBUG) += -DACPI_DEBUG_OUTPUT
+ Example::
- This variable is necessary because the top Makefile owns the
- variable $(KBUILD_CFLAGS) and uses it for compilation flags for the
- entire tree.
+ # drivers/acpi/acpica/Makefile
+ ccflags-y := -Os -D_LINUX -DBUILDING_ACPICA
+ ccflags-$(CONFIG_ACPI_DEBUG) += -DACPI_DEBUG_OUTPUT
- asflags-y specifies assembler options.
+ This variable is necessary because the top Makefile owns the
+ variable $(KBUILD_CFLAGS) and uses it for compilation flags for the
+ entire tree.
- Example::
+ asflags-y specifies assembler options.
- #arch/sparc/kernel/Makefile
- asflags-y := -ansi
+ Example::
- ldflags-y specifies options for linking with $(LD).
+ #arch/sparc/kernel/Makefile
+ asflags-y := -ansi
- Example::
+ ldflags-y specifies options for linking with $(LD).
- #arch/cris/boot/compressed/Makefile
- ldflags-y += -T $(srctree)/$(src)/decompress_$(arch-y).lds
+ Example::
- subdir-ccflags-y, subdir-asflags-y
- The two flags listed above are similar to ccflags-y and asflags-y.
- The difference is that the subdir- variants have effect for the kbuild
- file where they are present and all subdirectories.
- Options specified using subdir-* are added to the commandline before
- the options specified using the non-subdir variants.
+ #arch/cris/boot/compressed/Makefile
+ ldflags-y += -T $(srctree)/$(src)/decompress_$(arch-y).lds
- Example::
+subdir-ccflags-y, subdir-asflags-y
+ The two flags listed above are similar to ccflags-y and asflags-y.
+ The difference is that the subdir- variants have effect for the kbuild
+ file where they are present and all subdirectories.
+ Options specified using subdir-* are added to the commandline before
+ the options specified using the non-subdir variants.
- subdir-ccflags-y := -Werror
+ Example::
- ccflags-remove-y, asflags-remove-y
- These flags are used to remove particular flags for the compiler,
- assembler invocations.
+ subdir-ccflags-y := -Werror
- Example::
+ccflags-remove-y, asflags-remove-y
+ These flags are used to remove particular flags for the compiler,
+ assembler invocations.
- ccflags-remove-$(CONFIG_MCOUNT) += -pg
+ Example::
- CFLAGS_$@, AFLAGS_$@
- CFLAGS_$@ and AFLAGS_$@ only apply to commands in current
- kbuild makefile.
+ ccflags-remove-$(CONFIG_MCOUNT) += -pg
- $(CFLAGS_$@) specifies per-file options for $(CC). The $@
- part has a literal value which specifies the file that it is for.
+CFLAGS_$@, AFLAGS_$@
+ CFLAGS_$@ and AFLAGS_$@ only apply to commands in current
+ kbuild makefile.
- CFLAGS_$@ has the higher priority than ccflags-remove-y; CFLAGS_$@
- can re-add compiler flags that were removed by ccflags-remove-y.
+ $(CFLAGS_$@) specifies per-file options for $(CC). The $@
+ part has a literal value which specifies the file that it is for.
- Example::
+ CFLAGS_$@ has the higher priority than ccflags-remove-y; CFLAGS_$@
+ can re-add compiler flags that were removed by ccflags-remove-y.
- # drivers/scsi/Makefile
- CFLAGS_aha152x.o = -DAHA152X_STAT -DAUTOCONF
+ Example::
- This line specify compilation flags for aha152x.o.
+ # drivers/scsi/Makefile
+ CFLAGS_aha152x.o = -DAHA152X_STAT -DAUTOCONF
- $(AFLAGS_$@) is a similar feature for source files in assembly
- languages.
+ This line specify compilation flags for aha152x.o.
- AFLAGS_$@ has the higher priority than asflags-remove-y; AFLAGS_$@
- can re-add assembler flags that were removed by asflags-remove-y.
+ $(AFLAGS_$@) is a similar feature for source files in assembly
+ languages.
- Example::
+ AFLAGS_$@ has the higher priority than asflags-remove-y; AFLAGS_$@
+ can re-add assembler flags that were removed by asflags-remove-y.
- # arch/arm/kernel/Makefile
- AFLAGS_head.o := -DTEXT_OFFSET=$(TEXT_OFFSET)
- AFLAGS_crunch-bits.o := -Wa,-mcpu=ep9312
- AFLAGS_iwmmxt.o := -Wa,-mcpu=iwmmxt
+ Example::
+ # arch/arm/kernel/Makefile
+ AFLAGS_head.o := -DTEXT_OFFSET=$(TEXT_OFFSET)
+ AFLAGS_crunch-bits.o := -Wa,-mcpu=ep9312
+ AFLAGS_iwmmxt.o := -Wa,-mcpu=iwmmxt
-3.10 Dependency tracking
-------------------------
+Dependency tracking
+-------------------
- Kbuild tracks dependencies on the following:
+Kbuild tracks dependencies on the following:
- 1) All prerequisite files (both `*.c` and `*.h`)
- 2) `CONFIG_` options used in all prerequisite files
- 3) Command-line used to compile target
+1) All prerequisite files (both ``*.c`` and ``*.h``)
+2) ``CONFIG_`` options used in all prerequisite files
+3) Command-line used to compile target
- Thus, if you change an option to $(CC) all affected files will
- be re-compiled.
+Thus, if you change an option to $(CC) all affected files will
+be re-compiled.
-3.11 Custom Rules
------------------
+Custom Rules
+------------
- Custom rules are used when the kbuild infrastructure does
- not provide the required support. A typical example is
- header files generated during the build process.
- Another example are the architecture-specific Makefiles which
- need custom rules to prepare boot images etc.
+Custom rules are used when the kbuild infrastructure does
+not provide the required support. A typical example is
+header files generated during the build process.
+Another example are the architecture-specific Makefiles which
+need custom rules to prepare boot images etc.
- Custom rules are written as normal Make rules.
- Kbuild is not executing in the directory where the Makefile is
- located, so all custom rules shall use a relative
- path to prerequisite files and target files.
+Custom rules are written as normal Make rules.
+Kbuild is not executing in the directory where the Makefile is
+located, so all custom rules shall use a relative
+path to prerequisite files and target files.
- Two variables are used when defining custom rules:
+Two variables are used when defining custom rules:
- $(src)
- $(src) is a relative path which points to the directory
- where the Makefile is located. Always use $(src) when
- referring to files located in the src tree.
+$(src)
+ $(src) is a relative path which points to the directory
+ where the Makefile is located. Always use $(src) when
+ referring to files located in the src tree.
- $(obj)
- $(obj) is a relative path which points to the directory
- where the target is saved. Always use $(obj) when
- referring to generated files.
+$(obj)
+ $(obj) is a relative path which points to the directory
+ where the target is saved. Always use $(obj) when
+ referring to generated files.
- Example::
+ Example::
- #drivers/scsi/Makefile
- $(obj)/53c8xx_d.h: $(src)/53c7,8xx.scr $(src)/script_asm.pl
- $(CPP) -DCHIP=810 - < $< | ... $(src)/script_asm.pl
+ #drivers/scsi/Makefile
+ $(obj)/53c8xx_d.h: $(src)/53c7,8xx.scr $(src)/script_asm.pl
+ $(CPP) -DCHIP=810 - < $< | ... $(src)/script_asm.pl
- This is a custom rule, following the normal syntax
- required by make.
+ This is a custom rule, following the normal syntax
+ required by make.
- The target file depends on two prerequisite files. References
- to the target file are prefixed with $(obj), references
- to prerequisites are referenced with $(src) (because they are not
- generated files).
+ The target file depends on two prerequisite files. References
+ to the target file are prefixed with $(obj), references
+ to prerequisites are referenced with $(src) (because they are not
+ generated files).
- $(kecho)
- echoing information to user in a rule is often a good practice
- but when execution "make -s" one does not expect to see any output
- except for warnings/errors.
- To support this kbuild defines $(kecho) which will echo out the
- text following $(kecho) to stdout except if "make -s" is used.
+$(kecho)
+ echoing information to user in a rule is often a good practice
+ but when execution ``make -s`` one does not expect to see any output
+ except for warnings/errors.
+ To support this kbuild defines $(kecho) which will echo out the
+ text following $(kecho) to stdout except if ``make -s`` is used.
- Example::
+ Example::
- # arch/arm/Makefile
- $(BOOT_TARGETS): vmlinux
- $(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $(boot)/$@
- @$(kecho) ' Kernel: $(boot)/$@ is ready'
+ # arch/arm/Makefile
+ $(BOOT_TARGETS): vmlinux
+ $(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $(boot)/$@
+ @$(kecho) ' Kernel: $(boot)/$@ is ready'
- When kbuild is executing with KBUILD_VERBOSE=0, then only a shorthand
- of a command is normally displayed.
- To enable this behaviour for custom commands kbuild requires
- two variables to be set::
+ When kbuild is executing with KBUILD_VERBOSE unset, then only a shorthand
+ of a command is normally displayed.
+ To enable this behaviour for custom commands kbuild requires
+ two variables to be set::
- quiet_cmd_<command> - what shall be echoed
- cmd_<command> - the command to execute
+ quiet_cmd_<command> - what shall be echoed
+ cmd_<command> - the command to execute
- Example::
+ Example::
- # lib/Makefile
- quiet_cmd_crc32 = GEN $@
- cmd_crc32 = $< > $@
+ # lib/Makefile
+ quiet_cmd_crc32 = GEN $@
+ cmd_crc32 = $< > $@
- $(obj)/crc32table.h: $(obj)/gen_crc32table
- $(call cmd,crc32)
+ $(obj)/crc32table.h: $(obj)/gen_crc32table
+ $(call cmd,crc32)
- When updating the $(obj)/crc32table.h target, the line:
+ When updating the $(obj)/crc32table.h target, the line::
- GEN lib/crc32table.h
+ GEN lib/crc32table.h
- will be displayed with "make KBUILD_VERBOSE=0".
+ will be displayed with ``make KBUILD_VERBOSE=``.
-3.12 Command change detection
------------------------------
+Command change detection
+------------------------
- When the rule is evaluated, timestamps are compared between the target
- and its prerequisite files. GNU Make updates the target when any of the
- prerequisites is newer than that.
+When the rule is evaluated, timestamps are compared between the target
+and its prerequisite files. GNU Make updates the target when any of the
+prerequisites is newer than that.
- The target should be rebuilt also when the command line has changed
- since the last invocation. This is not supported by Make itself, so
- Kbuild achieves this by a kind of meta-programming.
+The target should be rebuilt also when the command line has changed
+since the last invocation. This is not supported by Make itself, so
+Kbuild achieves this by a kind of meta-programming.
- if_changed is the macro used for this purpose, in the following form::
+if_changed is the macro used for this purpose, in the following form::
- quiet_cmd_<command> = ...
- cmd_<command> = ...
+ quiet_cmd_<command> = ...
+ cmd_<command> = ...
- <target>: <source(s)> FORCE
- $(call if_changed,<command>)
+ <target>: <source(s)> FORCE
+ $(call if_changed,<command>)
- Any target that utilizes if_changed must be listed in $(targets),
- otherwise the command line check will fail, and the target will
- always be built.
+Any target that utilizes if_changed must be listed in $(targets),
+otherwise the command line check will fail, and the target will
+always be built.
- If the target is already listed in the recognized syntax such as
- obj-y/m, lib-y/m, extra-y/m, always-y/m, hostprogs, userprogs, Kbuild
- automatically adds it to $(targets). Otherwise, the target must be
- explicitly added to $(targets).
+If the target is already listed in the recognized syntax such as
+obj-y/m, lib-y/m, extra-y/m, always-y/m, hostprogs, userprogs, Kbuild
+automatically adds it to $(targets). Otherwise, the target must be
+explicitly added to $(targets).
- Assignments to $(targets) are without $(obj)/ prefix. if_changed may be
- used in conjunction with custom rules as defined in "3.11 Custom Rules".
+Assignments to $(targets) are without $(obj)/ prefix. if_changed may be
+used in conjunction with custom rules as defined in `Custom Rules`_.
- Note: It is a typical mistake to forget the FORCE prerequisite.
- Another common pitfall is that whitespace is sometimes significant; for
- instance, the below will fail (note the extra space after the comma)::
+Note: It is a typical mistake to forget the FORCE prerequisite.
+Another common pitfall is that whitespace is sometimes significant; for
+instance, the below will fail (note the extra space after the comma)::
- target: source(s) FORCE
+ target: source(s) FORCE
- **WRONG!** $(call if_changed, objcopy)
+**WRONG!** $(call if_changed, objcopy)
- Note:
- if_changed should not be used more than once per target.
- It stores the executed command in a corresponding .cmd
- file and multiple calls would result in overwrites and
- unwanted results when the target is up to date and only the
- tests on changed commands trigger execution of commands.
+Note:
+ if_changed should not be used more than once per target.
+ It stores the executed command in a corresponding .cmd
+ file and multiple calls would result in overwrites and
+ unwanted results when the target is up to date and only the
+ tests on changed commands trigger execution of commands.
-3.13 $(CC) support functions
-----------------------------
+$(CC) support functions
+-----------------------
- The kernel may be built with several different versions of
- $(CC), each supporting a unique set of features and options.
- kbuild provides basic support to check for valid options for $(CC).
- $(CC) is usually the gcc compiler, but other alternatives are
- available.
+The kernel may be built with several different versions of
+$(CC), each supporting a unique set of features and options.
+kbuild provides basic support to check for valid options for $(CC).
+$(CC) is usually the gcc compiler, but other alternatives are
+available.
- as-option
- as-option is used to check if $(CC) -- when used to compile
- assembler (`*.S`) files -- supports the given option. An optional
- second option may be specified if the first option is not supported.
+as-option
+ as-option is used to check if $(CC) -- when used to compile
+ assembler (``*.S``) files -- supports the given option. An optional
+ second option may be specified if the first option is not supported.
- Example::
+ Example::
- #arch/sh/Makefile
- cflags-y += $(call as-option,-Wa$(comma)-isa=$(isa-y),)
+ #arch/sh/Makefile
+ cflags-y += $(call as-option,-Wa$(comma)-isa=$(isa-y),)
- In the above example, cflags-y will be assigned the option
- -Wa$(comma)-isa=$(isa-y) if it is supported by $(CC).
- The second argument is optional, and if supplied will be used
- if first argument is not supported.
+ In the above example, cflags-y will be assigned the option
+ -Wa$(comma)-isa=$(isa-y) if it is supported by $(CC).
+ The second argument is optional, and if supplied will be used
+ if first argument is not supported.
- as-instr
- as-instr checks if the assembler reports a specific instruction
- and then outputs either option1 or option2
- C escapes are supported in the test instruction
- Note: as-instr-option uses KBUILD_AFLAGS for assembler options
+as-instr
+ as-instr checks if the assembler reports a specific instruction
+ and then outputs either option1 or option2
+ C escapes are supported in the test instruction
+ Note: as-instr-option uses KBUILD_AFLAGS for assembler options
- cc-option
- cc-option is used to check if $(CC) supports a given option, and if
- not supported to use an optional second option.
+cc-option
+ cc-option is used to check if $(CC) supports a given option, and if
+ not supported to use an optional second option.
- Example::
+ Example::
- #arch/x86/Makefile
- cflags-y += $(call cc-option,-march=pentium-mmx,-march=i586)
+ #arch/x86/Makefile
+ cflags-y += $(call cc-option,-march=pentium-mmx,-march=i586)
- In the above example, cflags-y will be assigned the option
- -march=pentium-mmx if supported by $(CC), otherwise -march=i586.
- The second argument to cc-option is optional, and if omitted,
- cflags-y will be assigned no value if first option is not supported.
- Note: cc-option uses KBUILD_CFLAGS for $(CC) options
+ In the above example, cflags-y will be assigned the option
+ -march=pentium-mmx if supported by $(CC), otherwise -march=i586.
+ The second argument to cc-option is optional, and if omitted,
+ cflags-y will be assigned no value if first option is not supported.
+ Note: cc-option uses KBUILD_CFLAGS for $(CC) options
- cc-option-yn
- cc-option-yn is used to check if gcc supports a given option
- and return 'y' if supported, otherwise 'n'.
+cc-option-yn
+ cc-option-yn is used to check if gcc supports a given option
+ and return "y" if supported, otherwise "n".
- Example::
+ Example::
- #arch/ppc/Makefile
- biarch := $(call cc-option-yn, -m32)
- aflags-$(biarch) += -a32
- cflags-$(biarch) += -m32
+ #arch/ppc/Makefile
+ biarch := $(call cc-option-yn, -m32)
+ aflags-$(biarch) += -a32
+ cflags-$(biarch) += -m32
- In the above example, $(biarch) is set to y if $(CC) supports the -m32
- option. When $(biarch) equals 'y', the expanded variables $(aflags-y)
- and $(cflags-y) will be assigned the values -a32 and -m32,
- respectively.
- Note: cc-option-yn uses KBUILD_CFLAGS for $(CC) options
+ In the above example, $(biarch) is set to y if $(CC) supports the -m32
+ option. When $(biarch) equals "y", the expanded variables $(aflags-y)
+ and $(cflags-y) will be assigned the values -a32 and -m32,
+ respectively.
- cc-disable-warning
- cc-disable-warning checks if gcc supports a given warning and returns
- the commandline switch to disable it. This special function is needed,
- because gcc 4.4 and later accept any unknown -Wno-* option and only
- warn about it if there is another warning in the source file.
+ Note: cc-option-yn uses KBUILD_CFLAGS for $(CC) options
- Example::
+cc-disable-warning
+ cc-disable-warning checks if gcc supports a given warning and returns
+ the commandline switch to disable it. This special function is needed,
+ because gcc 4.4 and later accept any unknown -Wno-* option and only
+ warn about it if there is another warning in the source file.
- KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
+ Example::
- In the above example, -Wno-unused-but-set-variable will be added to
- KBUILD_CFLAGS only if gcc really accepts it.
+ KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
- gcc-min-version
- gcc-min-version tests if the value of $(CONFIG_GCC_VERSION) is greater than
- or equal to the provided value and evaluates to y if so.
+ In the above example, -Wno-unused-but-set-variable will be added to
+ KBUILD_CFLAGS only if gcc really accepts it.
- Example::
+gcc-min-version
+ gcc-min-version tests if the value of $(CONFIG_GCC_VERSION) is greater than
+ or equal to the provided value and evaluates to y if so.
- cflags-$(call gcc-min-version, 70100) := -foo
+ Example::
- In this example, cflags-y will be assigned the value -foo if $(CC) is gcc and
- $(CONFIG_GCC_VERSION) is >= 7.1.
+ cflags-$(call gcc-min-version, 70100) := -foo
- clang-min-version
- clang-min-version tests if the value of $(CONFIG_CLANG_VERSION) is greater
- than or equal to the provided value and evaluates to y if so.
+ In this example, cflags-y will be assigned the value -foo if $(CC) is gcc and
+ $(CONFIG_GCC_VERSION) is >= 7.1.
- Example::
+clang-min-version
+ clang-min-version tests if the value of $(CONFIG_CLANG_VERSION) is greater
+ than or equal to the provided value and evaluates to y if so.
- cflags-$(call clang-min-version, 110000) := -foo
+ Example::
- In this example, cflags-y will be assigned the value -foo if $(CC) is clang
- and $(CONFIG_CLANG_VERSION) is >= 11.0.0.
+ cflags-$(call clang-min-version, 110000) := -foo
- cc-cross-prefix
- cc-cross-prefix is used to check if there exists a $(CC) in path with
- one of the listed prefixes. The first prefix where there exist a
- prefix$(CC) in the PATH is returned - and if no prefix$(CC) is found
- then nothing is returned.
- Additional prefixes are separated by a single space in the
- call of cc-cross-prefix.
- This functionality is useful for architecture Makefiles that try
- to set CROSS_COMPILE to well-known values but may have several
- values to select between.
- It is recommended only to try to set CROSS_COMPILE if it is a cross
- build (host arch is different from target arch). And if CROSS_COMPILE
- is already set then leave it with the old value.
+ In this example, cflags-y will be assigned the value -foo if $(CC) is clang
+ and $(CONFIG_CLANG_VERSION) is >= 11.0.0.
- Example::
+cc-cross-prefix
+ cc-cross-prefix is used to check if there exists a $(CC) in path with
+ one of the listed prefixes. The first prefix where there exist a
+ prefix$(CC) in the PATH is returned - and if no prefix$(CC) is found
+ then nothing is returned.
- #arch/m68k/Makefile
- ifneq ($(SUBARCH),$(ARCH))
- ifeq ($(CROSS_COMPILE),)
- CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu-)
- endif
- endif
+ Additional prefixes are separated by a single space in the
+ call of cc-cross-prefix.
-3.14 $(LD) support functions
-----------------------------
+ This functionality is useful for architecture Makefiles that try
+ to set CROSS_COMPILE to well-known values but may have several
+ values to select between.
- ld-option
- ld-option is used to check if $(LD) supports the supplied option.
- ld-option takes two options as arguments.
- The second argument is an optional option that can be used if the
- first option is not supported by $(LD).
+ It is recommended only to try to set CROSS_COMPILE if it is a cross
+ build (host arch is different from target arch). And if CROSS_COMPILE
+ is already set then leave it with the old value.
- Example::
+ Example::
- #Makefile
- LDFLAGS_vmlinux += $(call ld-option, -X)
+ #arch/m68k/Makefile
+ ifneq ($(SUBARCH),$(ARCH))
+ ifeq ($(CROSS_COMPILE),)
+ CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu-)
+ endif
+ endif
-3.15 Script invocation
-----------------------
+$(LD) support functions
+-----------------------
- Make rules may invoke scripts to build the kernel. The rules shall
- always provide the appropriate interpreter to execute the script. They
- shall not rely on the execute bits being set, and shall not invoke the
- script directly. For the convenience of manual script invocation, such
- as invoking ./scripts/checkpatch.pl, it is recommended to set execute
- bits on the scripts nonetheless.
+ld-option
+ ld-option is used to check if $(LD) supports the supplied option.
+ ld-option takes two options as arguments.
- Kbuild provides variables $(CONFIG_SHELL), $(AWK), $(PERL),
- and $(PYTHON3) to refer to interpreters for the respective
- scripts.
+ The second argument is an optional option that can be used if the
+ first option is not supported by $(LD).
- Example::
+ Example::
- #Makefile
- cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
- $(KERNELRELEASE)
+ #Makefile
+ LDFLAGS_vmlinux += $(call ld-option, -X)
-4 Host Program support
-======================
+Script invocation
+-----------------
+
+Make rules may invoke scripts to build the kernel. The rules shall
+always provide the appropriate interpreter to execute the script. They
+shall not rely on the execute bits being set, and shall not invoke the
+script directly. For the convenience of manual script invocation, such
+as invoking ./scripts/checkpatch.pl, it is recommended to set execute
+bits on the scripts nonetheless.
+
+Kbuild provides variables $(CONFIG_SHELL), $(AWK), $(PERL),
+and $(PYTHON3) to refer to interpreters for the respective
+scripts.
+
+Example::
+
+ #Makefile
+ cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
+ $(KERNELRELEASE)
+
+Host Program support
+====================
Kbuild supports building executables on the host for use during the
compilation stage.
+
Two steps are required in order to use a host executable.
The first step is to tell kbuild that a host program exists. This is
-done utilising the variable "hostprogs".
+done utilising the variable ``hostprogs``.
The second step is to add an explicit dependency to the executable.
This can be done in two ways. Either add the dependency in a rule,
-or utilise the variable "always-y".
+or utilise the variable ``always-y``.
Both possibilities are described in the following.
-4.1 Simple Host Program
------------------------
+Simple Host Program
+-------------------
- In some cases there is a need to compile and run a program on the
- computer where the build is running.
- The following line tells kbuild that the program bin2hex shall be
- built on the build host.
+In some cases there is a need to compile and run a program on the
+computer where the build is running.
- Example::
+The following line tells kbuild that the program bin2hex shall be
+built on the build host.
- hostprogs := bin2hex
+Example::
- Kbuild assumes in the above example that bin2hex is made from a single
- c-source file named bin2hex.c located in the same directory as
- the Makefile.
+ hostprogs := bin2hex
-4.2 Composite Host Programs
----------------------------
+Kbuild assumes in the above example that bin2hex is made from a single
+c-source file named bin2hex.c located in the same directory as
+the Makefile.
- Host programs can be made up based on composite objects.
- The syntax used to define composite objects for host programs is
- similar to the syntax used for kernel objects.
- $(<executable>-objs) lists all objects used to link the final
- executable.
+Composite Host Programs
+-----------------------
- Example::
+Host programs can be made up based on composite objects.
+The syntax used to define composite objects for host programs is
+similar to the syntax used for kernel objects.
+$(<executable>-objs) lists all objects used to link the final
+executable.
- #scripts/lxdialog/Makefile
- hostprogs := lxdialog
- lxdialog-objs := checklist.o lxdialog.o
+Example::
- Objects with extension .o are compiled from the corresponding .c
- files. In the above example, checklist.c is compiled to checklist.o
- and lxdialog.c is compiled to lxdialog.o.
+ #scripts/lxdialog/Makefile
+ hostprogs := lxdialog
+ lxdialog-objs := checklist.o lxdialog.o
- Finally, the two .o files are linked to the executable, lxdialog.
- Note: The syntax <executable>-y is not permitted for host-programs.
+Objects with extension .o are compiled from the corresponding .c
+files. In the above example, checklist.c is compiled to checklist.o
+and lxdialog.c is compiled to lxdialog.o.
-4.3 Using C++ for host programs
--------------------------------
+Finally, the two .o files are linked to the executable, lxdialog.
+Note: The syntax <executable>-y is not permitted for host-programs.
- kbuild offers support for host programs written in C++. This was
- introduced solely to support kconfig, and is not recommended
- for general use.
+Using C++ for host programs
+---------------------------
- Example::
+kbuild offers support for host programs written in C++. This was
+introduced solely to support kconfig, and is not recommended
+for general use.
- #scripts/kconfig/Makefile
- hostprogs := qconf
- qconf-cxxobjs := qconf.o
+Example::
- In the example above the executable is composed of the C++ file
- qconf.cc - identified by $(qconf-cxxobjs).
+ #scripts/kconfig/Makefile
+ hostprogs := qconf
+ qconf-cxxobjs := qconf.o
- If qconf is composed of a mixture of .c and .cc files, then an
- additional line can be used to identify this.
+In the example above the executable is composed of the C++ file
+qconf.cc - identified by $(qconf-cxxobjs).
- Example::
+If qconf is composed of a mixture of .c and .cc files, then an
+additional line can be used to identify this.
- #scripts/kconfig/Makefile
- hostprogs := qconf
- qconf-cxxobjs := qconf.o
- qconf-objs := check.o
+Example::
-4.4 Using Rust for host programs
---------------------------------
+ #scripts/kconfig/Makefile
+ hostprogs := qconf
+ qconf-cxxobjs := qconf.o
+ qconf-objs := check.o
- Kbuild offers support for host programs written in Rust. However,
- since a Rust toolchain is not mandatory for kernel compilation,
- it may only be used in scenarios where Rust is required to be
- available (e.g. when ``CONFIG_RUST`` is enabled).
+Using Rust for host programs
+----------------------------
- Example::
+Kbuild offers support for host programs written in Rust. However,
+since a Rust toolchain is not mandatory for kernel compilation,
+it may only be used in scenarios where Rust is required to be
+available (e.g. when ``CONFIG_RUST`` is enabled).
- hostprogs := target
- target-rust := y
+Example::
- Kbuild will compile ``target`` using ``target.rs`` as the crate root,
- located in the same directory as the ``Makefile``. The crate may
- consist of several source files (see ``samples/rust/hostprogs``).
+ hostprogs := target
+ target-rust := y
-4.5 Controlling compiler options for host programs
---------------------------------------------------
+Kbuild will compile ``target`` using ``target.rs`` as the crate root,
+located in the same directory as the ``Makefile``. The crate may
+consist of several source files (see ``samples/rust/hostprogs``).
- When compiling host programs, it is possible to set specific flags.
- The programs will always be compiled utilising $(HOSTCC) passed
- the options specified in $(KBUILD_HOSTCFLAGS).
- To set flags that will take effect for all host programs created
- in that Makefile, use the variable HOST_EXTRACFLAGS.
+Controlling compiler options for host programs
+----------------------------------------------
- Example::
+When compiling host programs, it is possible to set specific flags.
+The programs will always be compiled utilising $(HOSTCC) passed
+the options specified in $(KBUILD_HOSTCFLAGS).
- #scripts/lxdialog/Makefile
- HOST_EXTRACFLAGS += -I/usr/include/ncurses
+To set flags that will take effect for all host programs created
+in that Makefile, use the variable HOST_EXTRACFLAGS.
- To set specific flags for a single file the following construction
- is used:
+Example::
- Example::
+ #scripts/lxdialog/Makefile
+ HOST_EXTRACFLAGS += -I/usr/include/ncurses
- #arch/ppc64/boot/Makefile
- HOSTCFLAGS_piggyback.o := -DKERNELBASE=$(KERNELBASE)
+To set specific flags for a single file the following construction
+is used:
- It is also possible to specify additional options to the linker.
+Example::
- Example::
+ #arch/ppc64/boot/Makefile
+ HOSTCFLAGS_piggyback.o := -DKERNELBASE=$(KERNELBASE)
- #scripts/kconfig/Makefile
- HOSTLDLIBS_qconf := -L$(QTDIR)/lib
+It is also possible to specify additional options to the linker.
- When linking qconf, it will be passed the extra option
- "-L$(QTDIR)/lib".
+Example::
-4.6 When host programs are actually built
------------------------------------------
+ #scripts/kconfig/Makefile
+ HOSTLDLIBS_qconf := -L$(QTDIR)/lib
- Kbuild will only build host-programs when they are referenced
- as a prerequisite.
- This is possible in two ways:
+When linking qconf, it will be passed the extra option
+``-L$(QTDIR)/lib``.
- (1) List the prerequisite explicitly in a custom rule.
+When host programs are actually built
+-------------------------------------
- Example::
+Kbuild will only build host-programs when they are referenced
+as a prerequisite.
- #drivers/pci/Makefile
- hostprogs := gen-devlist
- $(obj)/devlist.h: $(src)/pci.ids $(obj)/gen-devlist
- ( cd $(obj); ./gen-devlist ) < $<
+This is possible in two ways:
- The target $(obj)/devlist.h will not be built before
- $(obj)/gen-devlist is updated. Note that references to
- the host programs in custom rules must be prefixed with $(obj).
+(1) List the prerequisite explicitly in a custom rule.
- (2) Use always-y
+ Example::
- When there is no suitable custom rule, and the host program
- shall be built when a makefile is entered, the always-y
- variable shall be used.
+ #drivers/pci/Makefile
+ hostprogs := gen-devlist
+ $(obj)/devlist.h: $(src)/pci.ids $(obj)/gen-devlist
+ ( cd $(obj); ./gen-devlist ) < $<
- Example::
+ The target $(obj)/devlist.h will not be built before
+ $(obj)/gen-devlist is updated. Note that references to
+ the host programs in custom rules must be prefixed with $(obj).
- #scripts/lxdialog/Makefile
- hostprogs := lxdialog
- always-y := $(hostprogs)
+(2) Use always-y
- Kbuild provides the following shorthand for this:
+ When there is no suitable custom rule, and the host program
+ shall be built when a makefile is entered, the always-y
+ variable shall be used.
- hostprogs-always-y := lxdialog
+ Example::
- This will tell kbuild to build lxdialog even if not referenced in
- any rule.
+ #scripts/lxdialog/Makefile
+ hostprogs := lxdialog
+ always-y := $(hostprogs)
-5 Userspace Program support
-===========================
+ Kbuild provides the following shorthand for this::
+
+ hostprogs-always-y := lxdialog
+
+ This will tell kbuild to build lxdialog even if not referenced in
+ any rule.
+
+Userspace Program support
+=========================
Just like host programs, Kbuild also supports building userspace executables
for the target architecture (i.e. the same architecture as you are building
the kernel for).
-The syntax is quite similar. The difference is to use "userprogs" instead of
-"hostprogs".
+The syntax is quite similar. The difference is to use ``userprogs`` instead of
+``hostprogs``.
-5.1 Simple Userspace Program
-----------------------------
+Simple Userspace Program
+------------------------
- The following line tells kbuild that the program bpf-direct shall be
- built for the target architecture.
+The following line tells kbuild that the program bpf-direct shall be
+built for the target architecture.
- Example::
+Example::
- userprogs := bpf-direct
+ userprogs := bpf-direct
- Kbuild assumes in the above example that bpf-direct is made from a
- single C source file named bpf-direct.c located in the same directory
- as the Makefile.
+Kbuild assumes in the above example that bpf-direct is made from a
+single C source file named bpf-direct.c located in the same directory
+as the Makefile.
-5.2 Composite Userspace Programs
---------------------------------
+Composite Userspace Programs
+----------------------------
- Userspace programs can be made up based on composite objects.
- The syntax used to define composite objects for userspace programs is
- similar to the syntax used for kernel objects.
- $(<executable>-objs) lists all objects used to link the final
- executable.
+Userspace programs can be made up based on composite objects.
+The syntax used to define composite objects for userspace programs is
+similar to the syntax used for kernel objects.
+$(<executable>-objs) lists all objects used to link the final
+executable.
- Example::
+Example::
- #samples/seccomp/Makefile
- userprogs := bpf-fancy
- bpf-fancy-objs := bpf-fancy.o bpf-helper.o
+ #samples/seccomp/Makefile
+ userprogs := bpf-fancy
+ bpf-fancy-objs := bpf-fancy.o bpf-helper.o
- Objects with extension .o are compiled from the corresponding .c
- files. In the above example, bpf-fancy.c is compiled to bpf-fancy.o
- and bpf-helper.c is compiled to bpf-helper.o.
+Objects with extension .o are compiled from the corresponding .c
+files. In the above example, bpf-fancy.c is compiled to bpf-fancy.o
+and bpf-helper.c is compiled to bpf-helper.o.
- Finally, the two .o files are linked to the executable, bpf-fancy.
- Note: The syntax <executable>-y is not permitted for userspace programs.
+Finally, the two .o files are linked to the executable, bpf-fancy.
+Note: The syntax <executable>-y is not permitted for userspace programs.
-5.3 Controlling compiler options for userspace programs
--------------------------------------------------------
+Controlling compiler options for userspace programs
+---------------------------------------------------
- When compiling userspace programs, it is possible to set specific flags.
- The programs will always be compiled utilising $(CC) passed
- the options specified in $(KBUILD_USERCFLAGS).
- To set flags that will take effect for all userspace programs created
- in that Makefile, use the variable userccflags.
+When compiling userspace programs, it is possible to set specific flags.
+The programs will always be compiled utilising $(CC) passed
+the options specified in $(KBUILD_USERCFLAGS).
- Example::
+To set flags that will take effect for all userspace programs created
+in that Makefile, use the variable userccflags.
- # samples/seccomp/Makefile
- userccflags += -I usr/include
+Example::
- To set specific flags for a single file the following construction
- is used:
+ # samples/seccomp/Makefile
+ userccflags += -I usr/include
- Example::
+To set specific flags for a single file the following construction
+is used:
- bpf-helper-userccflags += -I user/include
+Example::
- It is also possible to specify additional options to the linker.
+ bpf-helper-userccflags += -I user/include
- Example::
+It is also possible to specify additional options to the linker.
- # net/bpfilter/Makefile
- bpfilter_umh-userldflags += -static
+Example::
- When linking bpfilter_umh, it will be passed the extra option -static.
+ # net/bpfilter/Makefile
+ bpfilter_umh-userldflags += -static
- From command line, :ref:`USERCFLAGS and USERLDFLAGS <userkbuildflags>` will also be used.
+When linking bpfilter_umh, it will be passed the extra option -static.
-5.4 When userspace programs are actually built
-----------------------------------------------
+From command line, :ref:`USERCFLAGS and USERLDFLAGS <userkbuildflags>` will also be used.
+
+When userspace programs are actually built
+------------------------------------------
- Kbuild builds userspace programs only when told to do so.
- There are two ways to do this.
+Kbuild builds userspace programs only when told to do so.
+There are two ways to do this.
- (1) Add it as the prerequisite of another file
+(1) Add it as the prerequisite of another file
- Example::
+ Example::
- #net/bpfilter/Makefile
- userprogs := bpfilter_umh
- $(obj)/bpfilter_umh_blob.o: $(obj)/bpfilter_umh
+ #net/bpfilter/Makefile
+ userprogs := bpfilter_umh
+ $(obj)/bpfilter_umh_blob.o: $(obj)/bpfilter_umh
- $(obj)/bpfilter_umh is built before $(obj)/bpfilter_umh_blob.o
+ $(obj)/bpfilter_umh is built before $(obj)/bpfilter_umh_blob.o
- (2) Use always-y
+(2) Use always-y
- Example::
+ Example::
- userprogs := binderfs_example
- always-y := $(userprogs)
+ userprogs := binderfs_example
+ always-y := $(userprogs)
- Kbuild provides the following shorthand for this:
+ Kbuild provides the following shorthand for this::
- userprogs-always-y := binderfs_example
+ userprogs-always-y := binderfs_example
- This will tell Kbuild to build binderfs_example when it visits this
- Makefile.
+ This will tell Kbuild to build binderfs_example when it visits this
+ Makefile.
-6 Kbuild clean infrastructure
-=============================
+Kbuild clean infrastructure
+===========================
-"make clean" deletes most generated files in the obj tree where the kernel
+``make clean`` deletes most generated files in the obj tree where the kernel
is compiled. This includes generated files such as host programs.
Kbuild knows targets listed in $(hostprogs), $(always-y), $(always-m),
$(always-), $(extra-y), $(extra-) and $(targets). They are all deleted
-during "make clean". Files matching the patterns "*.[oas]", "*.ko", plus
+during ``make clean``. Files matching the patterns ``*.[oas]``, ``*.ko``, plus
some additional files generated by kbuild are deleted all over the kernel
-source tree when "make clean" is executed.
+source tree when ``make clean`` is executed.
Additional files or directories can be specified in kbuild makefiles by use of
$(clean-files).
- Example::
+Example::
- #lib/Makefile
- clean-files := crc32table.h
+ #lib/Makefile
+ clean-files := crc32table.h
-When executing "make clean", the file "crc32table.h" will be deleted.
+When executing ``make clean``, the file ``crc32table.h`` will be deleted.
Kbuild will assume files to be in the same relative directory as the
Makefile.
To exclude certain files or directories from make clean, use the
$(no-clean-files) variable.
-Usually kbuild descends down in subdirectories due to "obj-* := dir/",
+Usually kbuild descends down in subdirectories due to ``obj-* := dir/``,
but in the architecture makefiles where the kbuild infrastructure
is not sufficient this sometimes needs to be explicit.
- Example::
+Example::
- #arch/x86/boot/Makefile
- subdir- := compressed
+ #arch/x86/boot/Makefile
+ subdir- := compressed
The above assignment instructs kbuild to descend down in the
-directory compressed/ when "make clean" is executed.
+directory compressed/ when ``make clean`` is executed.
-Note 1: arch/$(SRCARCH)/Makefile cannot use "subdir-", because that file is
+Note 1: arch/$(SRCARCH)/Makefile cannot use ``subdir-``, because that file is
included in the top level makefile. Instead, arch/$(SRCARCH)/Kbuild can use
-"subdir-".
+``subdir-``.
Note 2: All directories listed in core-y, libs-y, drivers-y and net-y will
-be visited during "make clean".
+be visited during ``make clean``.
-7 Architecture Makefiles
-========================
+Architecture Makefiles
+======================
The top level Makefile sets up the environment and does the preparation,
before starting to descend down in the individual directories.
+
The top level makefile contains the generic part, whereas
arch/$(SRCARCH)/Makefile contains what is required to set up kbuild
for said architecture.
+
To do so, arch/$(SRCARCH)/Makefile sets up a number of variables and defines
a few targets.
When kbuild executes, the following steps are followed (roughly):
1) Configuration of the kernel => produce .config
+
2) Store kernel version in include/linux/version.h
+
3) Updating all other prerequisites to the target prepare:
+
- Additional prerequisites are specified in arch/$(SRCARCH)/Makefile
+
4) Recursively descend down in all directories listed in
init-* core* drivers-* net-* libs-* and build all targets.
+
- The values of the above variables are expanded in arch/$(SRCARCH)/Makefile.
+
5) All object files are then linked and the resulting file vmlinux is
located at the root of the obj tree.
The very first objects linked are listed in scripts/head-object-list.txt.
+
6) Finally, the architecture-specific part does any required post processing
and builds the final bootimage.
+
- This includes building boot records
- Preparing initrd images and the like
+Set variables to tweak the build to the architecture
+----------------------------------------------------
+
+KBUILD_LDFLAGS
+ Generic $(LD) options
+
+ Flags used for all invocations of the linker.
+ Often specifying the emulation is sufficient.
+
+ Example::
-7.1 Set variables to tweak the build to the architecture
---------------------------------------------------------
+ #arch/s390/Makefile
+ KBUILD_LDFLAGS := -m elf_s390
- KBUILD_LDFLAGS
- Generic $(LD) options
+ Note: ldflags-y can be used to further customise
+ the flags used. See `Non-builtin vmlinux targets - extra-y`_.
- Flags used for all invocations of the linker.
- Often specifying the emulation is sufficient.
+LDFLAGS_vmlinux
+ Options for $(LD) when linking vmlinux
- Example::
+ LDFLAGS_vmlinux is used to specify additional flags to pass to
+ the linker when linking the final vmlinux image.
- #arch/s390/Makefile
- KBUILD_LDFLAGS := -m elf_s390
+ LDFLAGS_vmlinux uses the LDFLAGS_$@ support.
- Note: ldflags-y can be used to further customise
- the flags used. See section 3.7.
+ Example::
- LDFLAGS_vmlinux
- Options for $(LD) when linking vmlinux
+ #arch/x86/Makefile
+ LDFLAGS_vmlinux := -e stext
- LDFLAGS_vmlinux is used to specify additional flags to pass to
- the linker when linking the final vmlinux image.
- LDFLAGS_vmlinux uses the LDFLAGS_$@ support.
+OBJCOPYFLAGS
+ objcopy flags
- Example::
+ When $(call if_changed,objcopy) is used to translate a .o file,
+ the flags specified in OBJCOPYFLAGS will be used.
- #arch/x86/Makefile
- LDFLAGS_vmlinux := -e stext
+ $(call if_changed,objcopy) is often used to generate raw binaries on
+ vmlinux.
- OBJCOPYFLAGS
- objcopy flags
+ Example::
- When $(call if_changed,objcopy) is used to translate a .o file,
- the flags specified in OBJCOPYFLAGS will be used.
- $(call if_changed,objcopy) is often used to generate raw binaries on
- vmlinux.
+ #arch/s390/Makefile
+ OBJCOPYFLAGS := -O binary
- Example::
+ #arch/s390/boot/Makefile
+ $(obj)/image: vmlinux FORCE
+ $(call if_changed,objcopy)
- #arch/s390/Makefile
- OBJCOPYFLAGS := -O binary
+ In this example, the binary $(obj)/image is a binary version of
+ vmlinux. The usage of $(call if_changed,xxx) will be described later.
- #arch/s390/boot/Makefile
- $(obj)/image: vmlinux FORCE
- $(call if_changed,objcopy)
+KBUILD_AFLAGS
+ Assembler flags
- In this example, the binary $(obj)/image is a binary version of
- vmlinux. The usage of $(call if_changed,xxx) will be described later.
+ Default value - see top level Makefile.
- KBUILD_AFLAGS
- Assembler flags
+ Append or modify as required per architecture.
- Default value - see top level Makefile
- Append or modify as required per architecture.
+ Example::
- Example::
+ #arch/sparc64/Makefile
+ KBUILD_AFLAGS += -m64 -mcpu=ultrasparc
- #arch/sparc64/Makefile
- KBUILD_AFLAGS += -m64 -mcpu=ultrasparc
+KBUILD_CFLAGS
+ $(CC) compiler flags
- KBUILD_CFLAGS
- $(CC) compiler flags
+ Default value - see top level Makefile.
- Default value - see top level Makefile
- Append or modify as required per architecture.
+ Append or modify as required per architecture.
- Often, the KBUILD_CFLAGS variable depends on the configuration.
+ Often, the KBUILD_CFLAGS variable depends on the configuration.
- Example::
+ Example::
- #arch/x86/boot/compressed/Makefile
- cflags-$(CONFIG_X86_32) := -march=i386
- cflags-$(CONFIG_X86_64) := -mcmodel=small
- KBUILD_CFLAGS += $(cflags-y)
+ #arch/x86/boot/compressed/Makefile
+ cflags-$(CONFIG_X86_32) := -march=i386
+ cflags-$(CONFIG_X86_64) := -mcmodel=small
+ KBUILD_CFLAGS += $(cflags-y)
- Many arch Makefiles dynamically run the target C compiler to
- probe supported options::
+ Many arch Makefiles dynamically run the target C compiler to
+ probe supported options::
- #arch/x86/Makefile
+ #arch/x86/Makefile
- ...
- cflags-$(CONFIG_MPENTIUMII) += $(call cc-option,\
+ ...
+ cflags-$(CONFIG_MPENTIUMII) += $(call cc-option,\
-march=pentium2,-march=i686)
- ...
- # Disable unit-at-a-time mode ...
- KBUILD_CFLAGS += $(call cc-option,-fno-unit-at-a-time)
- ...
+ ...
+ # Disable unit-at-a-time mode ...
+ KBUILD_CFLAGS += $(call cc-option,-fno-unit-at-a-time)
+ ...
- The first example utilises the trick that a config option expands
- to 'y' when selected.
+ The first example utilises the trick that a config option expands
+ to "y" when selected.
- KBUILD_RUSTFLAGS
- $(RUSTC) compiler flags
+KBUILD_RUSTFLAGS
+ $(RUSTC) compiler flags
- Default value - see top level Makefile
- Append or modify as required per architecture.
+ Default value - see top level Makefile.
- Often, the KBUILD_RUSTFLAGS variable depends on the configuration.
+ Append or modify as required per architecture.
- Note that target specification file generation (for ``--target``)
- is handled in ``scripts/generate_rust_target.rs``.
+ Often, the KBUILD_RUSTFLAGS variable depends on the configuration.
- KBUILD_AFLAGS_KERNEL
- Assembler options specific for built-in
+ Note that target specification file generation (for ``--target``)
+ is handled in ``scripts/generate_rust_target.rs``.
- $(KBUILD_AFLAGS_KERNEL) contains extra C compiler flags used to compile
- resident kernel code.
+KBUILD_AFLAGS_KERNEL
+ Assembler options specific for built-in
- KBUILD_AFLAGS_MODULE
- Assembler options specific for modules
+ $(KBUILD_AFLAGS_KERNEL) contains extra C compiler flags used to compile
+ resident kernel code.
- $(KBUILD_AFLAGS_MODULE) is used to add arch-specific options that
- are used for assembler.
+KBUILD_AFLAGS_MODULE
+ Assembler options specific for modules
- From commandline AFLAGS_MODULE shall be used (see kbuild.rst).
+ $(KBUILD_AFLAGS_MODULE) is used to add arch-specific options that
+ are used for assembler.
- KBUILD_CFLAGS_KERNEL
- $(CC) options specific for built-in
+ From commandline AFLAGS_MODULE shall be used (see kbuild.rst).
- $(KBUILD_CFLAGS_KERNEL) contains extra C compiler flags used to compile
- resident kernel code.
+KBUILD_CFLAGS_KERNEL
+ $(CC) options specific for built-in
- KBUILD_CFLAGS_MODULE
- Options for $(CC) when building modules
+ $(KBUILD_CFLAGS_KERNEL) contains extra C compiler flags used to compile
+ resident kernel code.
- $(KBUILD_CFLAGS_MODULE) is used to add arch-specific options that
- are used for $(CC).
- From commandline CFLAGS_MODULE shall be used (see kbuild.rst).
+KBUILD_CFLAGS_MODULE
+ Options for $(CC) when building modules
- KBUILD_RUSTFLAGS_KERNEL
- $(RUSTC) options specific for built-in
+ $(KBUILD_CFLAGS_MODULE) is used to add arch-specific options that
+ are used for $(CC).
- $(KBUILD_RUSTFLAGS_KERNEL) contains extra Rust compiler flags used to
- compile resident kernel code.
+ From commandline CFLAGS_MODULE shall be used (see kbuild.rst).
- KBUILD_RUSTFLAGS_MODULE
- Options for $(RUSTC) when building modules
+KBUILD_RUSTFLAGS_KERNEL
+ $(RUSTC) options specific for built-in
- $(KBUILD_RUSTFLAGS_MODULE) is used to add arch-specific options that
- are used for $(RUSTC).
- From commandline RUSTFLAGS_MODULE shall be used (see kbuild.rst).
+ $(KBUILD_RUSTFLAGS_KERNEL) contains extra Rust compiler flags used to
+ compile resident kernel code.
- KBUILD_LDFLAGS_MODULE
- Options for $(LD) when linking modules
+KBUILD_RUSTFLAGS_MODULE
+ Options for $(RUSTC) when building modules
- $(KBUILD_LDFLAGS_MODULE) is used to add arch-specific options
- used when linking modules. This is often a linker script.
+ $(KBUILD_RUSTFLAGS_MODULE) is used to add arch-specific options that
+ are used for $(RUSTC).
- From commandline LDFLAGS_MODULE shall be used (see kbuild.rst).
+ From commandline RUSTFLAGS_MODULE shall be used (see kbuild.rst).
- KBUILD_LDS
+KBUILD_LDFLAGS_MODULE
+ Options for $(LD) when linking modules
- The linker script with full path. Assigned by the top-level Makefile.
+ $(KBUILD_LDFLAGS_MODULE) is used to add arch-specific options
+ used when linking modules. This is often a linker script.
- KBUILD_LDS_MODULE
+ From commandline LDFLAGS_MODULE shall be used (see kbuild.rst).
- The module linker script with full path. Assigned by the top-level
- Makefile and additionally by the arch Makefile.
+KBUILD_LDS
+ The linker script with full path. Assigned by the top-level Makefile.
- KBUILD_VMLINUX_OBJS
+KBUILD_VMLINUX_OBJS
+ All object files for vmlinux. They are linked to vmlinux in the same
+ order as listed in KBUILD_VMLINUX_OBJS.
- All object files for vmlinux. They are linked to vmlinux in the same
- order as listed in KBUILD_VMLINUX_OBJS.
+ The objects listed in scripts/head-object-list.txt are exceptions;
+ they are placed before the other objects.
- The objects listed in scripts/head-object-list.txt are exceptions;
- they are placed before the other objects.
+KBUILD_VMLINUX_LIBS
+ All .a ``lib`` files for vmlinux. KBUILD_VMLINUX_OBJS and
+ KBUILD_VMLINUX_LIBS together specify all the object files used to
+ link vmlinux.
- KBUILD_VMLINUX_LIBS
+Add prerequisites to archheaders
+--------------------------------
- All .a "lib" files for vmlinux. KBUILD_VMLINUX_OBJS and
- KBUILD_VMLINUX_LIBS together specify all the object files used to
- link vmlinux.
+The archheaders: rule is used to generate header files that
+may be installed into user space by ``make header_install``.
-7.2 Add prerequisites to archheaders
-------------------------------------
+It is run before ``make archprepare`` when run on the
+architecture itself.
- The archheaders: rule is used to generate header files that
- may be installed into user space by "make header_install".
+Add prerequisites to archprepare
+--------------------------------
- It is run before "make archprepare" when run on the
- architecture itself.
+The archprepare: rule is used to list prerequisites that need to be
+built before starting to descend down in the subdirectories.
+This is usually used for header files containing assembler constants.
-7.3 Add prerequisites to archprepare
-------------------------------------
+Example::
- The archprepare: rule is used to list prerequisites that need to be
- built before starting to descend down in the subdirectories.
- This is usually used for header files containing assembler constants.
+ #arch/arm/Makefile
+ archprepare: maketools
- Example::
+In this example, the file target maketools will be processed
+before descending down in the subdirectories.
- #arch/arm/Makefile
- archprepare: maketools
+See also chapter XXX-TODO that describes how kbuild supports
+generating offset header files.
- In this example, the file target maketools will be processed
- before descending down in the subdirectories.
- See also chapter XXX-TODO that describes how kbuild supports
- generating offset header files.
+List directories to visit when descending
+-----------------------------------------
+An arch Makefile cooperates with the top Makefile to define variables
+which specify how to build the vmlinux file. Note that there is no
+corresponding arch-specific section for modules; the module-building
+machinery is all architecture-independent.
-7.4 List directories to visit when descending
----------------------------------------------
+core-y, libs-y, drivers-y
+ $(libs-y) lists directories where a lib.a archive can be located.
- An arch Makefile cooperates with the top Makefile to define variables
- which specify how to build the vmlinux file. Note that there is no
- corresponding arch-specific section for modules; the module-building
- machinery is all architecture-independent.
+ The rest list directories where a built-in.a object file can be
+ located.
+ Then the rest follows in this order:
- core-y, libs-y, drivers-y
+ $(core-y), $(libs-y), $(drivers-y)
- $(libs-y) lists directories where a lib.a archive can be located.
+ The top level Makefile defines values for all generic directories,
+ and arch/$(SRCARCH)/Makefile only adds architecture-specific
+ directories.
- The rest list directories where a built-in.a object file can be
- located.
+ Example::
- Then the rest follows in this order:
+ # arch/sparc/Makefile
+ core-y += arch/sparc/
- $(core-y), $(libs-y), $(drivers-y)
+ libs-y += arch/sparc/prom/
+ libs-y += arch/sparc/lib/
- The top level Makefile defines values for all generic directories,
- and arch/$(SRCARCH)/Makefile only adds architecture-specific
- directories.
+ drivers-$(CONFIG_PM) += arch/sparc/power/
- Example::
+Architecture-specific boot images
+---------------------------------
- # arch/sparc/Makefile
- core-y += arch/sparc/
+An arch Makefile specifies goals that take the vmlinux file, compress
+it, wrap it in bootstrapping code, and copy the resulting files
+somewhere. This includes various kinds of installation commands.
+The actual goals are not standardized across architectures.
- libs-y += arch/sparc/prom/
- libs-y += arch/sparc/lib/
+It is common to locate any additional processing in a boot/
+directory below arch/$(SRCARCH)/.
- drivers-$(CONFIG_PM) += arch/sparc/power/
+Kbuild does not provide any smart way to support building a
+target specified in boot/. Therefore arch/$(SRCARCH)/Makefile shall
+call make manually to build a target in boot/.
-7.5 Architecture-specific boot images
--------------------------------------
+The recommended approach is to include shortcuts in
+arch/$(SRCARCH)/Makefile, and use the full path when calling down
+into the arch/$(SRCARCH)/boot/Makefile.
- An arch Makefile specifies goals that take the vmlinux file, compress
- it, wrap it in bootstrapping code, and copy the resulting files
- somewhere. This includes various kinds of installation commands.
- The actual goals are not standardized across architectures.
+Example::
- It is common to locate any additional processing in a boot/
- directory below arch/$(SRCARCH)/.
+ #arch/x86/Makefile
+ boot := arch/x86/boot
+ bzImage: vmlinux
+ $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
- Kbuild does not provide any smart way to support building a
- target specified in boot/. Therefore arch/$(SRCARCH)/Makefile shall
- call make manually to build a target in boot/.
+``$(Q)$(MAKE) $(build)=<dir>`` is the recommended way to invoke
+make in a subdirectory.
- The recommended approach is to include shortcuts in
- arch/$(SRCARCH)/Makefile, and use the full path when calling down
- into the arch/$(SRCARCH)/boot/Makefile.
+There are no rules for naming architecture-specific targets,
+but executing ``make help`` will list all relevant targets.
+To support this, $(archhelp) must be defined.
- Example::
+Example::
- #arch/x86/Makefile
- boot := arch/x86/boot
- bzImage: vmlinux
- $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
+ #arch/x86/Makefile
+ define archhelp
+ echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)'
+ endif
- "$(Q)$(MAKE) $(build)=<dir>" is the recommended way to invoke
- make in a subdirectory.
+When make is executed without arguments, the first goal encountered
+will be built. In the top level Makefile the first goal present
+is all:.
- There are no rules for naming architecture-specific targets,
- but executing "make help" will list all relevant targets.
- To support this, $(archhelp) must be defined.
+An architecture shall always, per default, build a bootable image.
+In ``make help``, the default goal is highlighted with a ``*``.
- Example::
+Add a new prerequisite to all: to select a default goal different
+from vmlinux.
- #arch/x86/Makefile
- define archhelp
- echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)'
- endif
+Example::
- When make is executed without arguments, the first goal encountered
- will be built. In the top level Makefile the first goal present
- is all:.
- An architecture shall always, per default, build a bootable image.
- In "make help", the default goal is highlighted with a '*'.
- Add a new prerequisite to all: to select a default goal different
- from vmlinux.
+ #arch/x86/Makefile
+ all: bzImage
- Example::
+When ``make`` is executed without arguments, bzImage will be built.
- #arch/x86/Makefile
- all: bzImage
+Commands useful for building a boot image
+-----------------------------------------
- When "make" is executed without arguments, bzImage will be built.
+Kbuild provides a few macros that are useful when building a
+boot image.
-7.7 Commands useful for building a boot image
----------------------------------------------
+ld
+ Link target. Often, LDFLAGS_$@ is used to set specific options to ld.
- Kbuild provides a few macros that are useful when building a
- boot image.
+ Example::
- ld
- Link target. Often, LDFLAGS_$@ is used to set specific options to ld.
+ #arch/x86/boot/Makefile
+ LDFLAGS_bootsect := -Ttext 0x0 -s --oformat binary
+ LDFLAGS_setup := -Ttext 0x0 -s --oformat binary -e begtext
- Example::
+ targets += setup setup.o bootsect bootsect.o
+ $(obj)/setup $(obj)/bootsect: %: %.o FORCE
+ $(call if_changed,ld)
- #arch/x86/boot/Makefile
- LDFLAGS_bootsect := -Ttext 0x0 -s --oformat binary
- LDFLAGS_setup := -Ttext 0x0 -s --oformat binary -e begtext
+ In this example, there are two possible targets, requiring different
+ options to the linker. The linker options are specified using the
+ LDFLAGS_$@ syntax - one for each potential target.
- targets += setup setup.o bootsect bootsect.o
- $(obj)/setup $(obj)/bootsect: %: %.o FORCE
- $(call if_changed,ld)
+ $(targets) are assigned all potential targets, by which kbuild knows
+ the targets and will:
- In this example, there are two possible targets, requiring different
- options to the linker. The linker options are specified using the
- LDFLAGS_$@ syntax - one for each potential target.
- $(targets) are assigned all potential targets, by which kbuild knows
- the targets and will:
+ 1) check for commandline changes
+ 2) delete target during make clean
- 1) check for commandline changes
- 2) delete target during make clean
+ The ``: %: %.o`` part of the prerequisite is a shorthand that
+ frees us from listing the setup.o and bootsect.o files.
- The ": %: %.o" part of the prerequisite is a shorthand that
- frees us from listing the setup.o and bootsect.o files.
+ Note:
+ It is a common mistake to forget the ``targets :=`` assignment,
+ resulting in the target file being recompiled for no
+ obvious reason.
- Note:
- It is a common mistake to forget the "targets :=" assignment,
- resulting in the target file being recompiled for no
- obvious reason.
+objcopy
+ Copy binary. Uses OBJCOPYFLAGS usually specified in
+ arch/$(SRCARCH)/Makefile.
- objcopy
- Copy binary. Uses OBJCOPYFLAGS usually specified in
- arch/$(SRCARCH)/Makefile.
- OBJCOPYFLAGS_$@ may be used to set additional options.
+ OBJCOPYFLAGS_$@ may be used to set additional options.
- gzip
- Compress target. Use maximum compression to compress target.
+gzip
+ Compress target. Use maximum compression to compress target.
- Example::
+ Example::
- #arch/x86/boot/compressed/Makefile
- $(obj)/vmlinux.bin.gz: $(vmlinux.bin.all-y) FORCE
- $(call if_changed,gzip)
+ #arch/x86/boot/compressed/Makefile
+ $(obj)/vmlinux.bin.gz: $(vmlinux.bin.all-y) FORCE
+ $(call if_changed,gzip)
- dtc
- Create flattened device tree blob object suitable for linking
- into vmlinux. Device tree blobs linked into vmlinux are placed
- in an init section in the image. Platform code *must* copy the
- blob to non-init memory prior to calling unflatten_device_tree().
+dtc
+ Create flattened device tree blob object suitable for linking
+ into vmlinux. Device tree blobs linked into vmlinux are placed
+ in an init section in the image. Platform code *must* copy the
+ blob to non-init memory prior to calling unflatten_device_tree().
- To use this command, simply add `*.dtb` into obj-y or targets, or make
- some other target depend on `%.dtb`
+ To use this command, simply add ``*.dtb`` into obj-y or targets, or make
+ some other target depend on ``%.dtb``
- A central rule exists to create `$(obj)/%.dtb` from `$(src)/%.dts`;
- architecture Makefiles do no need to explicitly write out that rule.
+ A central rule exists to create ``$(obj)/%.dtb`` from ``$(src)/%.dts``;
+ architecture Makefiles do no need to explicitly write out that rule.
- Example::
+ Example::
- targets += $(dtb-y)
- DTC_FLAGS ?= -p 1024
+ targets += $(dtb-y)
+ DTC_FLAGS ?= -p 1024
-7.9 Preprocessing linker scripts
---------------------------------
+Preprocessing linker scripts
+----------------------------
- When the vmlinux image is built, the linker script
- arch/$(SRCARCH)/kernel/vmlinux.lds is used.
- The script is a preprocessed variant of the file vmlinux.lds.S
- located in the same directory.
- kbuild knows .lds files and includes a rule `*lds.S` -> `*lds`.
+When the vmlinux image is built, the linker script
+arch/$(SRCARCH)/kernel/vmlinux.lds is used.
- Example::
+The script is a preprocessed variant of the file vmlinux.lds.S
+located in the same directory.
- #arch/x86/kernel/Makefile
- extra-y := vmlinux.lds
+kbuild knows .lds files and includes a rule ``*lds.S`` -> ``*lds``.
- The assignment to extra-y is used to tell kbuild to build the
- target vmlinux.lds.
- The assignment to $(CPPFLAGS_vmlinux.lds) tells kbuild to use the
- specified options when building the target vmlinux.lds.
+Example::
- When building the `*.lds` target, kbuild uses the variables::
+ #arch/x86/kernel/Makefile
+ extra-y := vmlinux.lds
- KBUILD_CPPFLAGS : Set in top-level Makefile
- cppflags-y : May be set in the kbuild makefile
- CPPFLAGS_$(@F) : Target-specific flags.
- Note that the full filename is used in this
- assignment.
+The assignment to extra-y is used to tell kbuild to build the
+target vmlinux.lds.
- The kbuild infrastructure for `*lds` files is used in several
- architecture-specific files.
+The assignment to $(CPPFLAGS_vmlinux.lds) tells kbuild to use the
+specified options when building the target vmlinux.lds.
-7.10 Generic header files
--------------------------
+When building the ``*.lds`` target, kbuild uses the variables::
- The directory include/asm-generic contains the header files
- that may be shared between individual architectures.
- The recommended approach how to use a generic header file is
- to list the file in the Kbuild file.
- See "8.2 generic-y" for further info on syntax etc.
+ KBUILD_CPPFLAGS : Set in top-level Makefile
+ cppflags-y : May be set in the kbuild makefile
+ CPPFLAGS_$(@F) : Target-specific flags.
+ Note that the full filename is used in this
+ assignment.
-7.11 Post-link pass
--------------------
+The kbuild infrastructure for ``*lds`` files is used in several
+architecture-specific files.
+
+Generic header files
+--------------------
- If the file arch/xxx/Makefile.postlink exists, this makefile
- will be invoked for post-link objects (vmlinux and modules.ko)
- for architectures to run post-link passes on. Must also handle
- the clean target.
+The directory include/asm-generic contains the header files
+that may be shared between individual architectures.
- This pass runs after kallsyms generation. If the architecture
- needs to modify symbol locations, rather than manipulate the
- kallsyms, it may be easier to add another postlink target for
- .tmp_vmlinux? targets to be called from link-vmlinux.sh.
+The recommended approach how to use a generic header file is
+to list the file in the Kbuild file.
- For example, powerpc uses this to check relocation sanity of
- the linked vmlinux file.
+See `generic-y`_ for further info on syntax etc.
-8 Kbuild syntax for exported headers
-------------------------------------
+Post-link pass
+--------------
+
+If the file arch/xxx/Makefile.postlink exists, this makefile
+will be invoked for post-link objects (vmlinux and modules.ko)
+for architectures to run post-link passes on. Must also handle
+the clean target.
+
+This pass runs after kallsyms generation. If the architecture
+needs to modify symbol locations, rather than manipulate the
+kallsyms, it may be easier to add another postlink target for
+.tmp_vmlinux? targets to be called from link-vmlinux.sh.
+
+For example, powerpc uses this to check relocation sanity of
+the linked vmlinux file.
+
+Kbuild syntax for exported headers
+==================================
The kernel includes a set of headers that is exported to userspace.
Many headers can be exported as-is but other headers require a
minimal pre-processing before they are ready for user-space.
+
The pre-processing does:
- drop kernel-specific annotations
- drop include of compiler.h
-- drop all sections that are kernel internal (guarded by `ifdef __KERNEL__`)
+- drop all sections that are kernel internal (guarded by ``ifdef __KERNEL__``)
All headers under include/uapi/, include/generated/uapi/,
arch/<arch>/include/uapi/ and arch/<arch>/include/generated/uapi/
@@ -1526,139 +1492,139 @@ are exported.
A Kbuild file may be defined under arch/<arch>/include/uapi/asm/ and
arch/<arch>/include/asm/ to list asm files coming from asm-generic.
+
See subsequent chapter for the syntax of the Kbuild file.
-8.1 no-export-headers
----------------------
+no-export-headers
+-----------------
- no-export-headers is essentially used by include/uapi/linux/Kbuild to
- avoid exporting specific headers (e.g. kvm.h) on architectures that do
- not support it. It should be avoided as much as possible.
+no-export-headers is essentially used by include/uapi/linux/Kbuild to
+avoid exporting specific headers (e.g. kvm.h) on architectures that do
+not support it. It should be avoided as much as possible.
-8.2 generic-y
--------------
+generic-y
+---------
- If an architecture uses a verbatim copy of a header from
- include/asm-generic then this is listed in the file
- arch/$(SRCARCH)/include/asm/Kbuild like this:
+If an architecture uses a verbatim copy of a header from
+include/asm-generic then this is listed in the file
+arch/$(SRCARCH)/include/asm/Kbuild like this:
- Example::
+Example::
- #arch/x86/include/asm/Kbuild
- generic-y += termios.h
- generic-y += rtc.h
+ #arch/x86/include/asm/Kbuild
+ generic-y += termios.h
+ generic-y += rtc.h
- During the prepare phase of the build a wrapper include
- file is generated in the directory::
+During the prepare phase of the build a wrapper include
+file is generated in the directory::
- arch/$(SRCARCH)/include/generated/asm
+ arch/$(SRCARCH)/include/generated/asm
- When a header is exported where the architecture uses
- the generic header a similar wrapper is generated as part
- of the set of exported headers in the directory::
+When a header is exported where the architecture uses
+the generic header a similar wrapper is generated as part
+of the set of exported headers in the directory::
- usr/include/asm
+ usr/include/asm
- The generated wrapper will in both cases look like the following:
+The generated wrapper will in both cases look like the following:
- Example: termios.h::
+Example: termios.h::
- #include <asm-generic/termios.h>
+ #include <asm-generic/termios.h>
-8.3 generated-y
----------------
+generated-y
+-----------
- If an architecture generates other header files alongside generic-y
- wrappers, generated-y specifies them.
+If an architecture generates other header files alongside generic-y
+wrappers, generated-y specifies them.
- This prevents them being treated as stale asm-generic wrappers and
- removed.
+This prevents them being treated as stale asm-generic wrappers and
+removed.
- Example::
+Example::
- #arch/x86/include/asm/Kbuild
- generated-y += syscalls_32.h
+ #arch/x86/include/asm/Kbuild
+ generated-y += syscalls_32.h
-8.4 mandatory-y
----------------
+mandatory-y
+-----------
- mandatory-y is essentially used by include/(uapi/)asm-generic/Kbuild
- to define the minimum set of ASM headers that all architectures must have.
+mandatory-y is essentially used by include/(uapi/)asm-generic/Kbuild
+to define the minimum set of ASM headers that all architectures must have.
- This works like optional generic-y. If a mandatory header is missing
- in arch/$(SRCARCH)/include/(uapi/)/asm, Kbuild will automatically
- generate a wrapper of the asm-generic one.
+This works like optional generic-y. If a mandatory header is missing
+in arch/$(SRCARCH)/include/(uapi/)/asm, Kbuild will automatically
+generate a wrapper of the asm-generic one.
-9 Kbuild Variables
-==================
+Kbuild Variables
+================
The top Makefile exports the following variables:
- VERSION, PATCHLEVEL, SUBLEVEL, EXTRAVERSION
- These variables define the current kernel version. A few arch
- Makefiles actually use these values directly; they should use
- $(KERNELRELEASE) instead.
-
- $(VERSION), $(PATCHLEVEL), and $(SUBLEVEL) define the basic
- three-part version number, such as "2", "4", and "0". These three
- values are always numeric.
+VERSION, PATCHLEVEL, SUBLEVEL, EXTRAVERSION
+ These variables define the current kernel version. A few arch
+ Makefiles actually use these values directly; they should use
+ $(KERNELRELEASE) instead.
- $(EXTRAVERSION) defines an even tinier sublevel for pre-patches
- or additional patches. It is usually some non-numeric string
- such as "-pre4", and is often blank.
+ $(VERSION), $(PATCHLEVEL), and $(SUBLEVEL) define the basic
+ three-part version number, such as "2", "4", and "0". These three
+ values are always numeric.
- KERNELRELEASE
- $(KERNELRELEASE) is a single string such as "2.4.0-pre4", suitable
- for constructing installation directory names or showing in
- version strings. Some arch Makefiles use it for this purpose.
+ $(EXTRAVERSION) defines an even tinier sublevel for pre-patches
+ or additional patches. It is usually some non-numeric string
+ such as "-pre4", and is often blank.
- ARCH
- This variable defines the target architecture, such as "i386",
- "arm", or "sparc". Some kbuild Makefiles test $(ARCH) to
- determine which files to compile.
+KERNELRELEASE
+ $(KERNELRELEASE) is a single string such as "2.4.0-pre4", suitable
+ for constructing installation directory names or showing in
+ version strings. Some arch Makefiles use it for this purpose.
- By default, the top Makefile sets $(ARCH) to be the same as the
- host system architecture. For a cross build, a user may
- override the value of $(ARCH) on the command line::
+ARCH
+ This variable defines the target architecture, such as "i386",
+ "arm", or "sparc". Some kbuild Makefiles test $(ARCH) to
+ determine which files to compile.
- make ARCH=m68k ...
+ By default, the top Makefile sets $(ARCH) to be the same as the
+ host system architecture. For a cross build, a user may
+ override the value of $(ARCH) on the command line::
- SRCARCH
- This variable specifies the directory in arch/ to build.
+ make ARCH=m68k ...
- ARCH and SRCARCH may not necessarily match. A couple of arch
- directories are biarch, that is, a single `arch/*/` directory supports
- both 32-bit and 64-bit.
+SRCARCH
+ This variable specifies the directory in arch/ to build.
- For example, you can pass in ARCH=i386, ARCH=x86_64, or ARCH=x86.
- For all of them, SRCARCH=x86 because arch/x86/ supports both i386 and
- x86_64.
+ ARCH and SRCARCH may not necessarily match. A couple of arch
+ directories are biarch, that is, a single ``arch/*/`` directory supports
+ both 32-bit and 64-bit.
- INSTALL_PATH
- This variable defines a place for the arch Makefiles to install
- the resident kernel image and System.map file.
- Use this for architecture-specific install targets.
+ For example, you can pass in ARCH=i386, ARCH=x86_64, or ARCH=x86.
+ For all of them, SRCARCH=x86 because arch/x86/ supports both i386 and
+ x86_64.
- INSTALL_MOD_PATH, MODLIB
- $(INSTALL_MOD_PATH) specifies a prefix to $(MODLIB) for module
- installation. This variable is not defined in the Makefile but
- may be passed in by the user if desired.
+INSTALL_PATH
+ This variable defines a place for the arch Makefiles to install
+ the resident kernel image and System.map file.
+ Use this for architecture-specific install targets.
- $(MODLIB) specifies the directory for module installation.
- The top Makefile defines $(MODLIB) to
- $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE). The user may
- override this value on the command line if desired.
+INSTALL_MOD_PATH, MODLIB
+ $(INSTALL_MOD_PATH) specifies a prefix to $(MODLIB) for module
+ installation. This variable is not defined in the Makefile but
+ may be passed in by the user if desired.
- INSTALL_MOD_STRIP
- If this variable is specified, it will cause modules to be stripped
- after they are installed. If INSTALL_MOD_STRIP is '1', then the
- default option --strip-debug will be used. Otherwise, the
- INSTALL_MOD_STRIP value will be used as the option(s) to the strip
- command.
+ $(MODLIB) specifies the directory for module installation.
+ The top Makefile defines $(MODLIB) to
+ $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE). The user may
+ override this value on the command line if desired.
+INSTALL_MOD_STRIP
+ If this variable is specified, it will cause modules to be stripped
+ after they are installed. If INSTALL_MOD_STRIP is "1", then the
+ default option --strip-debug will be used. Otherwise, the
+ INSTALL_MOD_STRIP value will be used as the option(s) to the strip
+ command.
-10 Makefile language
-====================
+Makefile language
+=================
The kernel Makefiles are designed to be run with GNU Make. The Makefiles
use only the documented features of GNU Make, but they do use many
@@ -1666,27 +1632,27 @@ GNU extensions.
GNU Make supports elementary list-processing functions. The kernel
Makefiles use a novel style of list building and manipulation with few
-"if" statements.
+``if`` statements.
-GNU Make has two assignment operators, ":=" and "=". ":=" performs
+GNU Make has two assignment operators, ``:=`` and ``=``. ``:=`` performs
immediate evaluation of the right-hand side and stores an actual string
-into the left-hand side. "=" is like a formula definition; it stores the
+into the left-hand side. ``=`` is like a formula definition; it stores the
right-hand side in an unevaluated form and then evaluates this form each
time the left-hand side is used.
-There are some cases where "=" is appropriate. Usually, though, ":="
+There are some cases where ``=`` is appropriate. Usually, though, ``:=``
is the right choice.
-11 Credits
-==========
+Credits
+=======
- Original version made by Michael Elizabeth Chastain, <mailto:mec@shout.net>
- Updates by Kai Germaschewski <kai@tp1.ruhr-uni-bochum.de>
- Updates by Sam Ravnborg <sam@ravnborg.org>
- Language QA by Jan Engelhardt <jengelh@gmx.de>
-12 TODO
-=======
+TODO
+====
- Describe how kbuild supports shipped files with _shipped.
- Generating offset header files.
diff --git a/MAINTAINERS b/MAINTAINERS
index a86c34469e10adf3dbacc4a3facb989912ac09ee..203c2f141919837dc79a96b37f4d112a33146586 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -11085,7 +11085,7 @@ M: Masahiro Yamada <masahiroy@kernel.org>
L: linux-kbuild@vger.kernel.org
S: Maintained
Q: https://patchwork.kernel.org/project/linux-kbuild/list/
-T: git git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git kconfig
+T: git git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git kbuild
F: Documentation/kbuild/kconfig*
F: scripts/Kconfig.include
F: scripts/kconfig/
diff --git a/Makefile b/Makefile
index 126faecec461ff9993874ec1a2624daa9bc22d4b..aa26f34a9b522f35f5506655de7573db939bb264 100644
--- a/Makefile
+++ b/Makefile
@@ -56,26 +56,21 @@ unexport GREP_OPTIONS
# Beautify output
# ---------------------------------------------------------------------------
#
-# Normally, we echo the whole command before executing it. By making
-# that echo $($(quiet)$(cmd)), we now have the possibility to set
-# $(quiet) to choose other forms of output instead, e.g.
+# Most of build commands in Kbuild start with "cmd_". You can optionally define
+# "quiet_cmd_*". If defined, the short log is printed. Otherwise, no log from
+# that command is printed by default.
#
-# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
-# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
-#
-# If $(quiet) is empty, the whole command will be printed.
-# If it is set to "quiet_", only the short version will be printed.
-# If it is set to "silent_", nothing will be printed at all, since
-# the variable $(silent_cmd_cc_o_c) doesn't exist.
+# e.g.)
+# quiet_cmd_depmod = DEPMOD $(MODLIB)
+# cmd_depmod = $(srctree)/scripts/depmod.sh $(DEPMOD) $(KERNELRELEASE)
#
# A simple variant is to prefix commands with $(Q) - that's useful
# for commands that shall be hidden in non-verbose mode.
#
-# $(Q)ln $@ :<
+# $(Q)$(MAKE) $(build)=scripts/basic
#
-# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
-# If KBUILD_VERBOSE equals 1 then the above command is displayed.
-# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
+# If KBUILD_VERBOSE contains 1, the whole command is echoed.
+# If KBUILD_VERBOSE contains 2, the reason for rebuilding is printed.
#
# To put more focus on warnings, be less verbose as default
# Use 'make V=1' to see the full commands
@@ -83,16 +78,13 @@ unexport GREP_OPTIONS
ifeq ("$(origin V)", "command line")
KBUILD_VERBOSE = $(V)
endif
-ifndef KBUILD_VERBOSE
- KBUILD_VERBOSE = 0
-endif
-ifeq ($(KBUILD_VERBOSE),1)
+quiet = quiet_
+Q = @
+
+ifneq ($(findstring 1, $(KBUILD_VERBOSE)),)
quiet =
Q =
-else
- quiet=quiet_
- Q = @
endif
# If the user is running make -s (silent mode), suppress echoing of
@@ -100,14 +92,14 @@ endif
# make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS.
ifeq ($(filter 3.%,$(MAKE_VERSION)),)
-silence:=$(findstring s,$(firstword -$(MAKEFLAGS)))
+short-opts := $(firstword -$(MAKEFLAGS))
else
-silence:=$(findstring s,$(filter-out --%,$(MAKEFLAGS)))
+short-opts := $(filter-out --%,$(MAKEFLAGS))
endif
-ifeq ($(silence),s)
+ifneq ($(findstring s,$(short-opts)),)
quiet=silent_
-KBUILD_VERBOSE = 0
+override KBUILD_VERBOSE :=
endif
export quiet Q KBUILD_VERBOSE
@@ -211,14 +203,6 @@ ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
$(error source directory cannot contain spaces or colons)
endif
-ifneq ($(abs_srctree),$(abs_objtree))
-# Look for make include files relative to root of kernel src
-#
-# --included-dir is added for backward compatibility, but you should not rely on
-# it. Please add $(srctree)/ prefix to include Makefiles in the source tree.
-MAKEFLAGS += --include-dir=$(abs_srctree)
-endif
-
ifneq ($(filter 3.%,$(MAKE_VERSION)),)
# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
# We need to invoke sub-make to avoid implicit rules in the top Makefile.
@@ -290,7 +274,8 @@ no-dot-config-targets := $(clean-targets) \
cscope gtags TAGS tags help% %docs check% coccicheck \
$(version_h) headers headers_% archheaders archscripts \
%asm-generic kernelversion %src-pkg dt_binding_check \
- outputmakefile rustavailable rustfmt rustfmtcheck
+ outputmakefile rustavailable rustfmt rustfmtcheck \
+ scripts_package
# Installation targets should not require compiler. Unfortunately, vdso_install
# is an exception where build artifacts may be updated. This must be fixed.
no-compiler-targets := $(no-dot-config-targets) install dtbs_install \
@@ -577,7 +562,7 @@ KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
-std=gnu11
KBUILD_CPPFLAGS := -D__KERNEL__
KBUILD_RUSTFLAGS := $(rust_common_flags) \
- --target=$(objtree)/rust/target.json \
+ --target=$(objtree)/scripts/target.json \
-Cpanic=abort -Cembed-bitcode=n -Clto=n \
-Cforce-unwind-tables=n -Ccodegen-units=1 \
-Csymbol-mangling-version=v0 \
@@ -878,7 +863,6 @@ KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings
KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y)
ifdef CONFIG_CC_IS_CLANG
-KBUILD_CPPFLAGS += -Qunused-arguments
# The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable.
KBUILD_CFLAGS += -Wno-gnu
else
@@ -921,7 +905,9 @@ ifdef CONFIG_INIT_STACK_ALL_ZERO
KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
# https://github.com/llvm/llvm-project/issues/44842
-KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
+CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
+export CC_AUTO_VAR_INIT_ZERO_ENABLER
+KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER)
endif
endif
@@ -1267,8 +1253,11 @@ vmlinux: vmlinux.o $(KBUILD_LDS) modpost
# make sure no implicit rule kicks in
$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ;
-filechk_kernel.release = \
- echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
+ifeq ($(origin KERNELRELEASE),file)
+filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree)
+else
+filechk_kernel.release = echo $(KERNELRELEASE)
+endif
# Store (new) KERNELRELEASE string in include/config/kernel.release
include/config/kernel.release: FORCE
@@ -1545,7 +1534,7 @@ endif
# Build modules
#
-# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFOBTF_MODULES
+# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES
# is an exception.
ifdef CONFIG_DEBUG_INFO_BTF_MODULES
KBUILD_BUILTIN := 1
@@ -1617,7 +1606,7 @@ MRPROPER_FILES += include/config include/generated \
certs/x509.genkey \
vmlinux-gdb.py \
*.spec \
- rust/target.json rust/libmacros.so
+ rust/libmacros.so
# clean - Delete most, but leave enough to build external modules
#
@@ -1667,6 +1656,10 @@ distclean: mrproper
%pkg: include/config/kernel.release FORCE
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
+PHONY += scripts_package
+scripts_package: scripts_basic
+ $(Q)$(MAKE) $(build)=scripts scripts/list-gitignored
+
# Brief documentation of the typical targets used
# ---------------------------------------------------------------------------
@@ -1782,8 +1775,9 @@ help:
printf " %-16s - Show all of the above\\n" help-boards; \
echo '')
- @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
- @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
+ @echo ' make V=n [targets] 1: verbose build'
+ @echo ' 2: give reason for rebuild of target'
+ @echo ' V=1 and V=2 can be combined with V=12'
@echo ' make O=dir [targets] Locate all output files in "dir", including .config'
@echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
@echo ' (sparse by default)'
@@ -1875,6 +1869,12 @@ rust-analyzer:
# Misc
# ---------------------------------------------------------------------------
+PHONY += misc-check
+misc-check:
+ $(Q)$(srctree)/scripts/misc-check
+
+all: misc-check
+
PHONY += scripts_gdb
scripts_gdb: prepare0
$(Q)$(MAKE) $(build)=scripts/gdb
@@ -2046,11 +2046,12 @@ clean: $(clean-dirs)
-o -name '*.lex.c' -o -name '*.tab.[ch]' \
-o -name '*.asn1.[ch]' \
-o -name '*.symtypes' -o -name 'modules.order' \
- -o -name '.tmp_*' \
-o -name '*.c.[012]*.*' \
-o -name '*.ll' \
-o -name '*.gcno' \
- -o -name '*.*.symversions' \) -type f -print | xargs rm -f
+ -o -name '*.*.symversions' \) -type f -print \
+ -o -name '.tmp_*' -print \
+ | xargs rm -rf
# Generate tags for editors
# ---------------------------------------------------------------------------
@@ -2132,7 +2133,7 @@ checkstack:
$(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
kernelrelease:
- @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
+ @$(filechk_kernel.release)
kernelversion:
@echo $(KERNELVERSION)
diff --git a/arch/arm/mach-s3c/Makefile b/arch/arm/mach-s3c/Makefile
index 988c496727158228f3d1fa1211c1e1d6e5bb3332..713827bef83118a02149edb11fc5d50ed02e5f87 100644
--- a/arch/arm/mach-s3c/Makefile
+++ b/arch/arm/mach-s3c/Makefile
@@ -2,7 +2,7 @@
#
# Copyright 2009 Simtec Electronics
-include $(src)/Makefile.s3c64xx
+include $(srctree)/$(src)/Makefile.s3c64xx
# Objects we always build independent of SoC choice
diff --git a/arch/ia64/kernel/Makefile b/arch/ia64/kernel/Makefile
index ae9ff07de4abe419f3fdf8f740d148de1436332b..d7e1cabee2ec46bd8d3b74acde3bbb60832664fc 100644
--- a/arch/ia64/kernel/Makefile
+++ b/arch/ia64/kernel/Makefile
@@ -43,4 +43,4 @@ obj-$(CONFIG_ELF_CORE) += elfcore.o
CFLAGS_traps.o += -mfixed-range=f2-f5,f16-f31
# The gate DSO image is built using a special linker script.
-include $(src)/Makefile.gate
+include $(srctree)/$(src)/Makefile.gate
diff --git a/arch/mips/Kbuild b/arch/mips/Kbuild
index 9e8071f0e58ff1271c0bb118e12704838082aaba..af2967bffb73df2863c4f062abcc3f53d94b890c 100644
--- a/arch/mips/Kbuild
+++ b/arch/mips/Kbuild
@@ -7,7 +7,7 @@ subdir-ccflags-y := -Werror
endif
# platform specific definitions
-include arch/mips/Kbuild.platforms
+include $(srctree)/arch/mips/Kbuild.platforms
obj-y := $(platform-y)
# make clean traverses $(obj-) without having included .config, so
diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index 490dea07d4e09d0ec32cf1ba74d85f94ee87139f..04e46ec243195e0ede2796dc033833e37d47964d 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -95,7 +95,7 @@ all-$(CONFIG_SYS_SUPPORTS_ZBOOT)+= vmlinuz
# crossformat linking we rely on the elf2ecoff tool for format conversion.
#
cflags-y += -G 0 -mno-abicalls -fno-pic -pipe
-cflags-y += -msoft-float
+cflags-y += -msoft-float -Wa,-msoft-float
LDFLAGS_vmlinux += -G 0 -static -n -nostdlib
KBUILD_AFLAGS_MODULE += -mlong-calls
KBUILD_CFLAGS_MODULE += -mlong-calls
@@ -104,15 +104,6 @@ ifeq ($(CONFIG_RELOCATABLE),y)
LDFLAGS_vmlinux += --emit-relocs
endif
-#
-# pass -msoft-float to GAS if it supports it. However on newer binutils
-# (specifically newer than 2.24.51.20140728) we then also need to explicitly
-# set ".set hardfloat" in all files which manipulate floating point registers.
-#
-ifneq ($(call as-option,-Wa$(comma)-msoft-float,),)
- cflags-y += -DGAS_HAS_SET_HARDFLOAT -Wa,-msoft-float
-endif
-
cflags-y += -ffreestanding
cflags-$(CONFIG_CPU_BIG_ENDIAN) += -EB
@@ -152,7 +143,7 @@ cflags-y += -fno-stack-check
#
# Avoid this by explicitly disabling that assembler behaviour.
#
-cflags-y += $(call as-option,-Wa$(comma)-mno-fix-loongson3-llsc,)
+cflags-y += $(call cc-option,-Wa$(comma)-mno-fix-loongson3-llsc,)
#
# CPU-dependent compiler/assembler options for optimization.
diff --git a/arch/mips/Makefile.postlink b/arch/mips/Makefile.postlink
index 4b1d3ba3a8a2830a03787860b51e3cbb6e21a313..34e3bd71f3b0e4184028ab99b620774ea0ea3728 100644
--- a/arch/mips/Makefile.postlink
+++ b/arch/mips/Makefile.postlink
@@ -10,7 +10,7 @@ PHONY := __archpost
__archpost:
-include include/config/auto.conf
-include scripts/Kbuild.include
+include $(srctree)/scripts/Kbuild.include
CMD_LS3_LLSC = arch/mips/tools/loongson3-llsc-check
quiet_cmd_ls3_llsc = LLSCCHK $@
diff --git a/arch/mips/include/asm/asmmacro-32.h b/arch/mips/include/asm/asmmacro-32.h
index 1c08c1f7903c89880ff7f1f6c77a7a6261dee399..83a4940b7c891f873be5529dcef46c4f161d75c4 100644
--- a/arch/mips/include/asm/asmmacro-32.h
+++ b/arch/mips/include/asm/asmmacro-32.h
@@ -15,7 +15,7 @@
.macro fpu_save_single thread tmp=t0
.set push
- SET_HARDFLOAT
+ .set hardfloat
cfc1 \tmp, fcr31
s.d $f0, THREAD_FPR0(\thread)
s.d $f2, THREAD_FPR2(\thread)
@@ -39,7 +39,7 @@
.macro fpu_restore_single thread tmp=t0
.set push
- SET_HARDFLOAT
+ .set hardfloat
lw \tmp, THREAD_FCR31(\thread)
l.d $f0, THREAD_FPR0(\thread)
l.d $f2, THREAD_FPR2(\thread)
diff --git a/arch/mips/include/asm/asmmacro.h b/arch/mips/include/asm/asmmacro.h
index ca83ada7015f5287ad7ebea7dda9e4339c58fa84..1c4438f3f2ab43faf10a5a9e973bcc6cd66f4ebc 100644
--- a/arch/mips/include/asm/asmmacro.h
+++ b/arch/mips/include/asm/asmmacro.h
@@ -83,7 +83,7 @@
.macro fpu_save_16even thread tmp=t0
.set push
- SET_HARDFLOAT
+ .set hardfloat
cfc1 \tmp, fcr31
sdc1 $f0, THREAD_FPR0(\thread)
sdc1 $f2, THREAD_FPR2(\thread)
@@ -109,7 +109,7 @@
.set push
.set mips64r2
.set fp=64
- SET_HARDFLOAT
+ .set hardfloat
sdc1 $f1, THREAD_FPR1(\thread)
sdc1 $f3, THREAD_FPR3(\thread)
sdc1 $f5, THREAD_FPR5(\thread)
@@ -142,7 +142,7 @@
.macro fpu_restore_16even thread tmp=t0
.set push
- SET_HARDFLOAT
+ .set hardfloat
lw \tmp, THREAD_FCR31(\thread)
ldc1 $f0, THREAD_FPR0(\thread)
ldc1 $f2, THREAD_FPR2(\thread)
@@ -168,7 +168,7 @@
.set push
.set mips64r2
.set fp=64
- SET_HARDFLOAT
+ .set hardfloat
ldc1 $f1, THREAD_FPR1(\thread)
ldc1 $f3, THREAD_FPR3(\thread)
ldc1 $f5, THREAD_FPR5(\thread)
@@ -373,7 +373,7 @@
.macro _cfcmsa rd, cs
.set push
.set noat
- SET_HARDFLOAT
+ .set hardfloat
insn_if_mips 0x787e0059 | (\cs << 11)
insn32_if_mm 0x587e0056 | (\cs << 11)
move \rd, $1
@@ -383,7 +383,7 @@
.macro _ctcmsa cd, rs
.set push
.set noat
- SET_HARDFLOAT
+ .set hardfloat
move $1, \rs
insn_if_mips 0x783e0819 | (\cd << 6)
insn32_if_mm 0x583e0816 | (\cd << 6)
@@ -393,7 +393,7 @@
.macro ld_b wd, off, base
.set push
.set noat
- SET_HARDFLOAT
+ .set hardfloat
PTR_ADDU $1, \base, \off
insn_if_mips 0x78000820 | (\wd << 6)
insn32_if_mm 0x58000807 | (\wd << 6)
@@ -403,7 +403,7 @@
.macro ld_h wd, off, base
.set push
.set noat
- SET_HARDFLOAT
+ .set hardfloat
PTR_ADDU $1, \base, \off
insn_if_mips 0x78000821 | (\wd << 6)
insn32_if_mm 0x58000817 | (\wd << 6)
@@ -413,7 +413,7 @@
.macro ld_w wd, off, base
.set push
.set noat
- SET_HARDFLOAT
+ .set hardfloat
PTR_ADDU $1, \base, \off
insn_if_mips 0x78000822 | (\wd << 6)
insn32_if_mm 0x58000827 | (\wd << 6)
@@ -423,7 +423,7 @@
.macro ld_d wd, off, base
.set push
.set noat
- SET_HARDFLOAT
+ .set hardfloat
PTR_ADDU $1, \base, \off
insn_if_mips 0x78000823 | (\wd << 6)
insn32_if_mm 0x58000837 | (\wd << 6)
@@ -433,7 +433,7 @@
.macro st_b wd, off, base
.set push
.set noat
- SET_HARDFLOAT
+ .set hardfloat
PTR_ADDU $1, \base, \off
insn_if_mips 0x78000824 | (\wd << 6)
insn32_if_mm 0x5800080f | (\wd << 6)
@@ -443,7 +443,7 @@
.macro st_h wd, off, base
.set push
.set noat
- SET_HARDFLOAT
+ .set hardfloat
PTR_ADDU $1, \base, \off
insn_if_mips 0x78000825 | (\wd << 6)
insn32_if_mm 0x5800081f | (\wd << 6)
@@ -453,7 +453,7 @@
.macro st_w wd, off, base
.set push
.set noat
- SET_HARDFLOAT
+ .set hardfloat
PTR_ADDU $1, \base, \off
insn_if_mips 0x78000826 | (\wd << 6)
insn32_if_mm 0x5800082f | (\wd << 6)
@@ -463,7 +463,7 @@
.macro st_d wd, off, base
.set push
.set noat
- SET_HARDFLOAT
+ .set hardfloat
PTR_ADDU $1, \base, \off
insn_if_mips 0x78000827 | (\wd << 6)
insn32_if_mm 0x5800083f | (\wd << 6)
@@ -473,7 +473,7 @@
.macro copy_s_w ws, n
.set push
.set noat
- SET_HARDFLOAT
+ .set hardfloat
insn_if_mips 0x78b00059 | (\n << 16) | (\ws << 11)
insn32_if_mm 0x58b00056 | (\n << 16) | (\ws << 11)
.set pop
@@ -482,7 +482,7 @@
.macro copy_s_d ws, n
.set push
.set noat
- SET_HARDFLOAT
+ .set hardfloat
insn_if_mips 0x78b80059 | (\n << 16) | (\ws << 11)
insn32_if_mm 0x58b80056 | (\n << 16) | (\ws << 11)
.set pop
@@ -491,7 +491,7 @@
.macro insert_w wd, n
.set push
.set noat
- SET_HARDFLOAT
+ .set hardfloat
insn_if_mips 0x79300819 | (\n << 16) | (\wd << 6)
insn32_if_mm 0x59300816 | (\n << 16) | (\wd << 6)
.set pop
@@ -500,7 +500,7 @@
.macro insert_d wd, n
.set push
.set noat
- SET_HARDFLOAT
+ .set hardfloat
insn_if_mips 0x79380819 | (\n << 16) | (\wd << 6)
insn32_if_mm 0x59380816 | (\n << 16) | (\wd << 6)
.set pop
@@ -553,7 +553,7 @@
st_d 29, THREAD_FPR29 - FPR_BASE_OFFS, FPR_BASE
st_d 30, THREAD_FPR30 - FPR_BASE_OFFS, FPR_BASE
st_d 31, THREAD_FPR31 - FPR_BASE_OFFS, FPR_BASE
- SET_HARDFLOAT
+ .set hardfloat
_cfcmsa $1, MSA_CSR
sw $1, THREAD_MSA_CSR(\thread)
.set pop
@@ -562,7 +562,7 @@
.macro msa_restore_all thread
.set push
.set noat
- SET_HARDFLOAT
+ .set hardfloat
lw $1, THREAD_MSA_CSR(\thread)
_ctcmsa MSA_CSR, $1
#ifdef TOOLCHAIN_SUPPORTS_MSA
@@ -618,7 +618,7 @@
.macro msa_init_all_upper
.set push
.set noat
- SET_HARDFLOAT
+ .set hardfloat
not $1, zero
msa_init_upper 0
msa_init_upper 1
diff --git a/arch/mips/include/asm/fpregdef.h b/arch/mips/include/asm/fpregdef.h
index f184ba088532635068f1944f858c249675dbd991..429481f9028dd08119e9961ab8669c04181a6ad3 100644
--- a/arch/mips/include/asm/fpregdef.h
+++ b/arch/mips/include/asm/fpregdef.h
@@ -14,20 +14,6 @@
#include <asm/sgidefs.h>
-/*
- * starting with binutils 2.24.51.20140729, MIPS binutils warn about mixing
- * hardfloat and softfloat object files. The kernel build uses soft-float by
- * default, so we also need to pass -msoft-float along to GAS if it supports it.
- * But this in turn causes assembler errors in files which access hardfloat
- * registers. We detect if GAS supports "-msoft-float" in the Makefile and
- * explicitly put ".set hardfloat" where floating point registers are touched.
- */
-#ifdef GAS_HAS_SET_HARDFLOAT
-#define SET_HARDFLOAT .set hardfloat
-#else
-#define SET_HARDFLOAT
-#endif
-
#if _MIPS_SIM == _MIPS_SIM_ABI32
/*
diff --git a/arch/mips/include/asm/mipsregs.h b/arch/mips/include/asm/mipsregs.h
index 99eeafe6dcabdbc4e1c17f7faf6b0ceb6840e61f..2d53704d9f2461e1dadfc93a16b96904c821f5c2 100644
--- a/arch/mips/include/asm/mipsregs.h
+++ b/arch/mips/include/asm/mipsregs.h
@@ -2367,7 +2367,7 @@ do { \
/*
* Macros to access the floating point coprocessor control registers
*/
-#define _read_32bit_cp1_register(source, gas_hardfloat) \
+#define read_32bit_cp1_register(source) \
({ \
unsigned int __res; \
\
@@ -2377,36 +2377,24 @@ do { \
" # gas fails to assemble cfc1 for some archs, \n" \
" # like Octeon. \n" \
" .set mips1 \n" \
- " "STR(gas_hardfloat)" \n" \
+ " .set hardfloat \n" \
" cfc1 %0,"STR(source)" \n" \
" .set pop \n" \
: "=r" (__res)); \
__res; \
})
-#define _write_32bit_cp1_register(dest, val, gas_hardfloat) \
+#define write_32bit_cp1_register(dest, val) \
do { \
__asm__ __volatile__( \
" .set push \n" \
" .set reorder \n" \
- " "STR(gas_hardfloat)" \n" \
+ " .set hardfloat \n" \
" ctc1 %0,"STR(dest)" \n" \
" .set pop \n" \
: : "r" (val)); \
} while (0)
-#ifdef GAS_HAS_SET_HARDFLOAT
-#define read_32bit_cp1_register(source) \
- _read_32bit_cp1_register(source, .set hardfloat)
-#define write_32bit_cp1_register(dest, val) \
- _write_32bit_cp1_register(dest, val, .set hardfloat)
-#else
-#define read_32bit_cp1_register(source) \
- _read_32bit_cp1_register(source, )
-#define write_32bit_cp1_register(dest, val) \
- _write_32bit_cp1_register(dest, val, )
-#endif
-
#ifdef TOOLCHAIN_SUPPORTS_DSP
#define rddsp(mask) \
({ \
diff --git a/arch/mips/kernel/genex.S b/arch/mips/kernel/genex.S
index 3425df6019c08d2258c932c73e3dd08450393e85..b6de8e88c1bd428f1f1b7eee6b1118c9304e3601 100644
--- a/arch/mips/kernel/genex.S
+++ b/arch/mips/kernel/genex.S
@@ -480,7 +480,7 @@ NESTED(nmi_handler, PT_SIZE, sp)
.set push
/* gas fails to assemble cfc1 for some archs (octeon).*/ \
.set mips1
- SET_HARDFLOAT
+ .set hardfloat
cfc1 a1, fcr31
.set pop
.endm
diff --git a/arch/mips/kernel/r2300_fpu.S b/arch/mips/kernel/r2300_fpu.S
index 2748c55820c24666b8b36b103e88ca1deeaa8c01..6c745aa9e82598fdf5608039d1f5c81ad391f953 100644
--- a/arch/mips/kernel/r2300_fpu.S
+++ b/arch/mips/kernel/r2300_fpu.S
@@ -64,7 +64,7 @@ LEAF(_restore_fp)
*/
LEAF(_save_fp_context)
.set push
- SET_HARDFLOAT
+ .set hardfloat
li v0, 0 # assume success
cfc1 t1, fcr31
EX2(s.d $f0, 0(a0))
@@ -98,7 +98,7 @@ LEAF(_save_fp_context)
*/
LEAF(_restore_fp_context)
.set push
- SET_HARDFLOAT
+ .set hardfloat
li v0, 0 # assume success
EX(lw t0, (a1))
EX2(l.d $f0, 0(a0))
diff --git a/arch/mips/kernel/r4k_fpu.S b/arch/mips/kernel/r4k_fpu.S
index 2e687c60bc4f1938db72c8326bbb9455f05304bf..4e8c98517d9d4ebe44830e9c26f7f91ddf47857d 100644
--- a/arch/mips/kernel/r4k_fpu.S
+++ b/arch/mips/kernel/r4k_fpu.S
@@ -26,7 +26,7 @@
.macro EX insn, reg, src
.set push
- SET_HARDFLOAT
+ .set hardfloat
.set nomacro
.ex\@: \insn \reg, \src
.set pop
@@ -98,14 +98,14 @@ LEAF(_init_msa_upper)
*/
LEAF(_save_fp_context)
.set push
- SET_HARDFLOAT
+ .set hardfloat
cfc1 t1, fcr31
.set pop
#if defined(CONFIG_64BIT) || defined(CONFIG_CPU_MIPSR2) || \
defined(CONFIG_CPU_MIPSR5) || defined(CONFIG_CPU_MIPSR6)
.set push
- SET_HARDFLOAT
+ .set hardfloat
#if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR5)
.set mips32r2
.set fp=64
@@ -135,7 +135,7 @@ LEAF(_save_fp_context)
#endif
.set push
- SET_HARDFLOAT
+ .set hardfloat
/* Store the 16 even double precision registers */
EX sdc1 $f0, 0(a0)
EX sdc1 $f2, 16(a0)
@@ -173,7 +173,7 @@ LEAF(_restore_fp_context)
#if defined(CONFIG_64BIT) || defined(CONFIG_CPU_MIPSR2) || \
defined(CONFIG_CPU_MIPSR5) || defined(CONFIG_CPU_MIPSR6)
.set push
- SET_HARDFLOAT
+ .set hardfloat
#if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR5)
.set mips32r2
.set fp=64
@@ -201,7 +201,7 @@ LEAF(_restore_fp_context)
1: .set pop
#endif
.set push
- SET_HARDFLOAT
+ .set hardfloat
EX ldc1 $f0, 0(a0)
EX ldc1 $f2, 16(a0)
EX ldc1 $f4, 32(a0)
diff --git a/arch/mips/kvm/fpu.S b/arch/mips/kvm/fpu.S
index 16f17c6390dd000248abcfde1c272dbd0ae679df..eb2e8cc3532fc5b0be85d293aa6437d379756206 100644
--- a/arch/mips/kvm/fpu.S
+++ b/arch/mips/kvm/fpu.S
@@ -22,7 +22,7 @@
LEAF(__kvm_save_fpu)
.set push
- SET_HARDFLOAT
+ .set hardfloat
.set fp=64
mfc0 t0, CP0_STATUS
sll t0, t0, 5 # is Status.FR set?
@@ -66,7 +66,7 @@ LEAF(__kvm_save_fpu)
LEAF(__kvm_restore_fpu)
.set push
- SET_HARDFLOAT
+ .set hardfloat
.set fp=64
mfc0 t0, CP0_STATUS
sll t0, t0, 5 # is Status.FR set?
@@ -110,7 +110,7 @@ LEAF(__kvm_restore_fpu)
LEAF(__kvm_restore_fcsr)
.set push
- SET_HARDFLOAT
+ .set hardfloat
lw t0, VCPU_FCR31(a0)
/*
* The ctc1 must stay at this offset in __kvm_restore_fcsr.
diff --git a/arch/mips/loongson2ef/Platform b/arch/mips/loongson2ef/Platform
index eebabf9df6ac051957440a23d522d1c0c190c814..c6f7a4b959978933272aabfd25dd77ce711fe10b 100644
--- a/arch/mips/loongson2ef/Platform
+++ b/arch/mips/loongson2ef/Platform
@@ -25,7 +25,7 @@ cflags-$(CONFIG_CPU_LOONGSON2F) += -march=loongson2f
# binutils does not merge support for the flag then we can revisit & remove
# this later - for now it ensures vendor toolchains don't cause problems.
#
-cflags-$(CONFIG_CPU_LOONGSON2EF) += $(call as-option,-Wa$(comma)-mno-fix-loongson3-llsc,)
+cflags-$(CONFIG_CPU_LOONGSON2EF) += $(call cc-option,-Wa$(comma)-mno-fix-loongson3-llsc,)
# Enable the workarounds for Loongson2f
ifdef CONFIG_CPU_LOONGSON2F_WORKAROUNDS
diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 87d6ac27eebd219870bcb745d8a07cb0c6b5a35e..e91d7e91347d583d51287dceba4f474aa9ef52c3 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -90,7 +90,7 @@ aflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mlittle-endian
ifeq ($(HAS_BIARCH),y)
KBUILD_CFLAGS += -m$(BITS)
-KBUILD_AFLAGS += -m$(BITS) -Wl,-a$(BITS)
+KBUILD_AFLAGS += -m$(BITS)
KBUILD_LDFLAGS += -m elf$(BITS)$(LDEMULATION)
endif
diff --git a/arch/powerpc/Makefile.postlink b/arch/powerpc/Makefile.postlink
index a6c77f4d32b276e469da37c07c59f3a9a6940b36..1f860b3c9bec549f9fec6762199473871f9590fc 100644
--- a/arch/powerpc/Makefile.postlink
+++ b/arch/powerpc/Makefile.postlink
@@ -9,7 +9,7 @@ PHONY := __archpost
__archpost:
-include include/config/auto.conf
-include scripts/Kbuild.include
+include $(srctree)/scripts/Kbuild.include
quiet_cmd_head_check = CHKHEAD $@
cmd_head_check = $(CONFIG_SHELL) $(srctree)/arch/powerpc/tools/head_check.sh "$(NM)" "$@"
diff --git a/arch/powerpc/kernel/prom_init_check.sh b/arch/powerpc/kernel/prom_init_check.sh
index 311890d71c4c9870ac7f5bf10f8dc2572f9300af..5a319863f2890f4a6aca7ee9b25948fe659f3eea 100644
--- a/arch/powerpc/kernel/prom_init_check.sh
+++ b/arch/powerpc/kernel/prom_init_check.sh
@@ -51,11 +51,10 @@ do
# a leading . on the name, so strip it off here.
UNDEF="${UNDEF#.}"
- if [ $KBUILD_VERBOSE ]; then
- if [ $KBUILD_VERBOSE -ne 0 ]; then
- echo "Checking prom_init.o symbol '$UNDEF'"
- fi
- fi
+ case "$KBUILD_VERBOSE" in
+ *1*)
+ echo "Checking prom_init.o symbol '$UNDEF'" ;;
+ esac
OK=0
for WHITE in $WHITELIST
diff --git a/arch/powerpc/kernel/vdso/Makefile b/arch/powerpc/kernel/vdso/Makefile
index 3a2f32929fcf4950c34da7ce5ca5df5279264b9e..66f723f53be2bb01462a17c19a8b13480c35becb 100644
--- a/arch/powerpc/kernel/vdso/Makefile
+++ b/arch/powerpc/kernel/vdso/Makefile
@@ -16,6 +16,11 @@ ifneq ($(c-gettimeofday-y),)
CFLAGS_vgettimeofday-32.o += -ffreestanding -fasynchronous-unwind-tables
CFLAGS_REMOVE_vgettimeofday-32.o = $(CC_FLAGS_FTRACE)
CFLAGS_REMOVE_vgettimeofday-32.o += -mcmodel=medium -mabi=elfv1 -mabi=elfv2 -mcall-aixdesc
+ # This flag is supported by clang for 64-bit but not 32-bit so it will cause
+ # an unused command line flag warning for this file.
+ ifdef CONFIG_CC_IS_CLANG
+ CFLAGS_REMOVE_vgettimeofday-32.o += -fno-stack-clash-protection
+ endif
CFLAGS_vgettimeofday-64.o += -include $(c-gettimeofday-y)
CFLAGS_vgettimeofday-64.o += $(DISABLE_LATENT_ENTROPY_PLUGIN)
CFLAGS_vgettimeofday-64.o += $(call cc-option, -fno-stack-protector)
@@ -48,14 +53,18 @@ UBSAN_SANITIZE := n
KASAN_SANITIZE := n
KCSAN_SANITIZE := n
-ccflags-y := -shared -fno-common -fno-builtin -nostdlib -Wl,--hash-style=both
-ccflags-$(CONFIG_LD_IS_LLD) += $(call cc-option,--ld-path=$(LD),-fuse-ld=lld)
+ccflags-y := -fno-common -fno-builtin
+ldflags-y := -Wl,--hash-style=both -nostdlib -shared -z noexecstack
+ldflags-$(CONFIG_LD_IS_LLD) += $(call cc-option,--ld-path=$(LD),-fuse-ld=lld)
+# Filter flags that clang will warn are unused for linking
+ldflags-y += $(filter-out $(CC_AUTO_VAR_INIT_ZERO_ENABLER) $(CC_FLAGS_FTRACE) -Wa$(comma)%, $(KBUILD_CFLAGS))
-CC32FLAGS := -Wl,-soname=linux-vdso32.so.1 -m32
-AS32FLAGS := -D__VDSO32__ -s
+CC32FLAGS := -m32
+LD32FLAGS := -Wl,-soname=linux-vdso32.so.1
+AS32FLAGS := -D__VDSO32__
-CC64FLAGS := -Wl,-soname=linux-vdso64.so.1
-AS64FLAGS := -D__VDSO64__ -s
+LD64FLAGS := -Wl,-soname=linux-vdso64.so.1
+AS64FLAGS := -D__VDSO64__
targets += vdso32.lds
CPPFLAGS_vdso32.lds += -P -C -Upowerpc
@@ -93,15 +102,15 @@ include/generated/vdso64-offsets.h: $(obj)/vdso64.so.dbg FORCE
# actual build commands
quiet_cmd_vdso32ld_and_check = VDSO32L $@
- cmd_vdso32ld_and_check = $(VDSOCC) $(c_flags) $(CC32FLAGS) -o $@ -Wl,-T$(filter %.lds,$^) $(filter %.o,$^) -z noexecstack ; $(cmd_vdso_check)
+ cmd_vdso32ld_and_check = $(VDSOCC) $(ldflags-y) $(CC32FLAGS) $(LD32FLAGS) -o $@ -Wl,-T$(filter %.lds,$^) $(filter %.o,$^); $(cmd_vdso_check)
quiet_cmd_vdso32as = VDSO32A $@
cmd_vdso32as = $(VDSOCC) $(a_flags) $(CC32FLAGS) $(AS32FLAGS) -c -o $@ $<
quiet_cmd_vdso32cc = VDSO32C $@
cmd_vdso32cc = $(VDSOCC) $(c_flags) $(CC32FLAGS) -c -o $@ $<
quiet_cmd_vdso64ld_and_check = VDSO64L $@
- cmd_vdso64ld_and_check = $(VDSOCC) $(c_flags) $(CC64FLAGS) -o $@ -Wl,-T$(filter %.lds,$^) $(filter %.o,$^) -z noexecstack ; $(cmd_vdso_check)
+ cmd_vdso64ld_and_check = $(VDSOCC) $(ldflags-y) $(LD64FLAGS) -o $@ -Wl,-T$(filter %.lds,$^) $(filter %.o,$^); $(cmd_vdso_check)
quiet_cmd_vdso64as = VDSO64A $@
- cmd_vdso64as = $(VDSOCC) $(a_flags) $(CC64FLAGS) $(AS64FLAGS) -c -o $@ $<
+ cmd_vdso64as = $(VDSOCC) $(a_flags) $(AS64FLAGS) -c -o $@ $<
OBJECT_FILES_NON_STANDARD := y
diff --git a/arch/s390/kernel/vdso64/Makefile b/arch/s390/kernel/vdso64/Makefile
index 9e2b95a222a9838fb2f7c06eee6b104b29f53d93..34f9542636e92e30325a74e4e2c89cd89e1b4fb5 100644
--- a/arch/s390/kernel/vdso64/Makefile
+++ b/arch/s390/kernel/vdso64/Makefile
@@ -22,10 +22,10 @@ KBUILD_AFLAGS += -DBUILD_VDSO
KBUILD_CFLAGS += -DBUILD_VDSO -DDISABLE_BRANCH_PROFILING
KBUILD_AFLAGS_64 := $(filter-out -m64,$(KBUILD_AFLAGS))
-KBUILD_AFLAGS_64 += -m64 -s
+KBUILD_AFLAGS_64 += -m64
KBUILD_CFLAGS_64 := $(filter-out -m64,$(KBUILD_CFLAGS))
-KBUILD_CFLAGS_64 += -m64 -fPIC -shared -fno-common -fno-builtin
+KBUILD_CFLAGS_64 += -m64 -fPIC -fno-common -fno-builtin
ldflags-y := -fPIC -shared -soname=linux-vdso64.so.1 \
--hash-style=both --build-id=sha1 -T
diff --git a/arch/s390/purgatory/Makefile b/arch/s390/purgatory/Makefile
index d237bc6841cb8608c2bb3118d549d8f9bf9c7c5b..32573b4f9bd20b13eba7bb51220e344dcf238178 100644
--- a/arch/s390/purgatory/Makefile
+++ b/arch/s390/purgatory/Makefile
@@ -24,7 +24,7 @@ KCSAN_SANITIZE := n
KBUILD_CFLAGS := -fno-strict-aliasing -Wall -Wstrict-prototypes
KBUILD_CFLAGS += -Wno-pointer-sign -Wno-sign-compare
KBUILD_CFLAGS += -fno-zero-initialized-in-bss -fno-builtin -ffreestanding
-KBUILD_CFLAGS += -c -MD -Os -m64 -msoft-float -fno-common
+KBUILD_CFLAGS += -Os -m64 -msoft-float -fno-common
KBUILD_CFLAGS += -fno-stack-protector
KBUILD_CFLAGS += $(CLANG_FLAGS)
KBUILD_CFLAGS += $(call cc-option,-fno-PIE)
diff --git a/arch/sh/boot/compressed/Makefile b/arch/sh/boot/compressed/Makefile
index 591125c42d49df489b93990f5b331bf08e90e648..b5e29f99c02c84c05ae03a0bc4c945e3b1599dc6 100644
--- a/arch/sh/boot/compressed/Makefile
+++ b/arch/sh/boot/compressed/Makefile
@@ -8,13 +8,6 @@
OBJECTS := head_32.o misc.o cache.o piggy.o \
ashiftrt.o ashldi3.o ashrsi3.o ashlsi3.o lshrsi3.o
-# These were previously generated files. When you are building the kernel
-# with O=, make sure to remove the stale files in the output tree. Otherwise,
-# the build system wrongly compiles the stale ones.
-ifdef building_out_of_srctree
-$(shell rm -f $(addprefix $(obj)/, ashiftrt.S ashldi3.c ashrsi3.S ashlsi3.S lshrsi3.S))
-endif
-
targets := vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2 \
vmlinux.bin.lzma vmlinux.bin.xz vmlinux.bin.lzo $(OBJECTS)
diff --git a/arch/um/drivers/Makefile b/arch/um/drivers/Makefile
index e1dc4292bd22e67d617ebc1baad38fed8a8320cd..dee6f66353b334c6b55de0097409f2ce11cb7a26 100644
--- a/arch/um/drivers/Makefile
+++ b/arch/um/drivers/Makefile
@@ -72,4 +72,4 @@ CFLAGS_null.o = -DDEV_NULL=$(DEV_NULL_PATH)
CFLAGS_xterm.o += '-DCONFIG_XTERM_CHAN_DEFAULT_EMULATOR="$(CONFIG_XTERM_CHAN_DEFAULT_EMULATOR)"'
-include arch/um/scripts/Makefile.rules
+include $(srctree)/arch/um/scripts/Makefile.rules
diff --git a/arch/um/kernel/Makefile b/arch/um/kernel/Makefile
index 1c2d4b29a3d4619e6591dde869eda4320efdc23c..811188be954cad1e2317df9fb21137f9dddfa95e 100644
--- a/arch/um/kernel/Makefile
+++ b/arch/um/kernel/Makefile
@@ -29,7 +29,7 @@ obj-$(CONFIG_GENERIC_PCI_IOMAP) += ioport.o
USER_OBJS := config.o
-include arch/um/scripts/Makefile.rules
+include $(srctree)/arch/um/scripts/Makefile.rules
targets := config.c config.tmp capflags.c
diff --git a/arch/um/kernel/skas/Makefile b/arch/um/kernel/skas/Makefile
index f3d494a4fd9ba2a627a6109b692d2e8f423de2a1..f93972a257653b7c7ccb2f09743f1e46add7c4fb 100644
--- a/arch/um/kernel/skas/Makefile
+++ b/arch/um/kernel/skas/Makefile
@@ -14,4 +14,4 @@ UNPROFILE_OBJS := clone.o
KCOV_INSTRUMENT := n
-include arch/um/scripts/Makefile.rules
+include $(srctree)/arch/um/scripts/Makefile.rules
diff --git a/arch/um/os-Linux/Makefile b/arch/um/os-Linux/Makefile
index 77ac50baa3f82c0bb1532ee454d0af3b216260b6..544e0b344c754aedcf51b73e91dca8e74211a225 100644
--- a/arch/um/os-Linux/Makefile
+++ b/arch/um/os-Linux/Makefile
@@ -18,4 +18,4 @@ USER_OBJS := $(user-objs-y) elf_aux.o execvp.o file.o helper.o irq.o \
main.o mem.o process.o registers.o sigio.o signal.o start_up.o time.o \
tty.o umid.o util.o
-include arch/um/scripts/Makefile.rules
+include $(srctree)/arch/um/scripts/Makefile.rules
diff --git a/arch/um/os-Linux/drivers/Makefile b/arch/um/os-Linux/drivers/Makefile
index d79e75f1b69a2892f4cdf393f38a0b9abb1056a3..cf2d75bb188485dfe0a739d125466e796cb4f505 100644
--- a/arch/um/os-Linux/drivers/Makefile
+++ b/arch/um/os-Linux/drivers/Makefile
@@ -10,4 +10,4 @@ obj-y =
obj-$(CONFIG_UML_NET_ETHERTAP) += ethertap.o
obj-$(CONFIG_UML_NET_TUNTAP) += tuntap.o
-include arch/um/scripts/Makefile.rules
+include $(srctree)/arch/um/scripts/Makefile.rules
diff --git a/arch/um/os-Linux/skas/Makefile b/arch/um/os-Linux/skas/Makefile
index c4566e78881509e71603b6249253785785d31e1a..75f11989d2e90e246e4a68f4f7fcdd1b4ae49807 100644
--- a/arch/um/os-Linux/skas/Makefile
+++ b/arch/um/os-Linux/skas/Makefile
@@ -7,4 +7,4 @@ obj-y := mem.o process.o
USER_OBJS := $(obj-y)
-include arch/um/scripts/Makefile.rules
+include $(srctree)/arch/um/scripts/Makefile.rules
diff --git a/arch/x86/Makefile.um b/arch/x86/Makefile.um
index b3c1ae084180dc6afab8cecc1fa319fe4a947524..b89e2e0024c574fbec4b17c5a226a7d5d4e4879e 100644
--- a/arch/x86/Makefile.um
+++ b/arch/x86/Makefile.um
@@ -17,7 +17,7 @@ LDS_EXTRA := -Ui386
export LDS_EXTRA
# First of all, tune CFLAGS for the specific CPU. This actually sets cflags-y.
-include arch/x86/Makefile_32.cpu
+include $(srctree)/arch/x86/Makefile_32.cpu
# prevent gcc from keeping the stack 16 byte aligned. Taken from i386.
cflags-y += $(call cc-option,-mpreferred-stack-boundary=2)
diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile
index 1acff356d97a9cd7f39a0955450819b1c67d24c1..6b6cfe607bdbdfaa3ab42a7a1850b10fe3e31e91 100644
--- a/arch/x86/boot/compressed/Makefile
+++ b/arch/x86/boot/compressed/Makefile
@@ -50,7 +50,7 @@ KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
KBUILD_CFLAGS += -D__DISABLE_EXPORTS
# Disable relocation relaxation in case the link is not PIE.
-KBUILD_CFLAGS += $(call as-option,-Wa$(comma)-mrelax-relocations=no)
+KBUILD_CFLAGS += $(call cc-option,-Wa$(comma)-mrelax-relocations=no)
KBUILD_CFLAGS += -include $(srctree)/include/linux/hidden.h
# sev.c indirectly inludes inat-table.h which is generated during
diff --git a/arch/x86/tools/Makefile b/arch/x86/tools/Makefile
index bddfc9a466453126d00d9f19e40fefc0fff1b3b1..90e820ac9771fe0dafe962bf4949dcead4ba0eb0 100644
--- a/arch/x86/tools/Makefile
+++ b/arch/x86/tools/Makefile
@@ -1,7 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
PHONY += posttest
-ifeq ($(KBUILD_VERBOSE),1)
+ifneq ($(findstring 1, $(KBUILD_VERBOSE)),)
posttest_verbose = -v
else
posttest_verbose =
diff --git a/arch/x86/um/Makefile b/arch/x86/um/Makefile
index 3d5cd2e578202ea8f2b3ac62585c43fc908b3d50..ee89f6bb9242636900dab80c31bdfc371896ee05 100644
--- a/arch/x86/um/Makefile
+++ b/arch/x86/um/Makefile
@@ -48,4 +48,4 @@ include/generated/user_constants.h: $(obj)/user-offsets.s FORCE
UNPROFILE_OBJS := stub_segv.o
CFLAGS_stub_segv.o := $(CFLAGS_NO_HARDENING)
-include arch/um/scripts/Makefile.rules
+include $(srctree)/arch/um/scripts/Makefile.rules
diff --git a/arch/x86/um/os-Linux/Makefile b/arch/x86/um/os-Linux/Makefile
index 253bfb8cb702da1d30e10b1c3e36ff5a7e90926c..ae169125d03fcc41ebd159dca6d58ee9ed964f55 100644
--- a/arch/x86/um/os-Linux/Makefile
+++ b/arch/x86/um/os-Linux/Makefile
@@ -10,4 +10,4 @@ obj-$(CONFIG_64BIT) += prctl.o
USER_OBJS := $(obj-y)
-include arch/um/scripts/Makefile.rules
+include $(srctree)/arch/um/scripts/Makefile.rules
diff --git a/certs/extract-cert.c b/certs/extract-cert.c
index 8c1fb9a70d66b8758cd8b3b89a4872debe588488..70e9ec89d87d3606d25ded861c47d78ab1579cf6 100644
--- a/certs/extract-cert.c
+++ b/certs/extract-cert.c
@@ -78,7 +78,7 @@ static void drain_openssl_errors(void)
static const char *key_pass;
static BIO *wb;
static char *cert_dst;
-static int kbuild_verbose;
+static bool verbose;
static void write_cert(X509 *x509)
{
@@ -90,19 +90,22 @@ static void write_cert(X509 *x509)
}
X509_NAME_oneline(X509_get_subject_name(x509), buf, sizeof(buf));
ERR(!i2d_X509_bio(wb, x509), "%s", cert_dst);
- if (kbuild_verbose)
+ if (verbose)
fprintf(stderr, "Extracted cert: %s\n", buf);
}
int main(int argc, char **argv)
{
char *cert_src;
+ char *verbose_env;
OpenSSL_add_all_algorithms();
ERR_load_crypto_strings();
ERR_clear_error();
- kbuild_verbose = atoi(getenv("KBUILD_VERBOSE")?:"0");
+ verbose_env = getenv("KBUILD_VERBOSE");
+ if (verbose_env && strchr(verbose_env, '1'))
+ verbose = true;
key_pass = getenv("KBUILD_SIGN_PIN");
diff --git a/drivers/Makefile b/drivers/Makefile
index 7d01fa2b2b7ec94dbc5f07bd6d67276e727cf151..20b118dca999fad5f9e78232c747f50e0da6386a 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -6,6 +6,11 @@
# Rewritten to use lists instead of if-statements.
#
+# Some driver Makefiles miss $(srctree)/ for include directive.
+ifdef building_out_of_srctree
+MAKEFLAGS += --include-dir=$(srctree)
+endif
+
obj-y += irqchip/
obj-y += bus/
diff --git a/drivers/gpu/drm/amd/display/dc/dml/Makefile b/drivers/gpu/drm/amd/display/dc/dml/Makefile
index 0ecea87cf48f2397fd4703d595e63ee2e79ffb65..9d0f79dff2e30583f2db38454ab07b191a9045b0 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dml/Makefile
@@ -26,7 +26,8 @@
# subcomponents.
ifdef CONFIG_X86
-dml_ccflags := -mhard-float -msse
+dml_ccflags-$(CONFIG_CC_IS_GCC) := -mhard-float
+dml_ccflags := $(dml_ccflags-y) -msse
endif
ifdef CONFIG_PPC64
diff --git a/fs/hostfs/Makefile b/fs/hostfs/Makefile
index d5beaffad43b71ccb0090112d6fadc7ee27673d0..587bcd6e50a3a0170e3d34d948959755524df885 100644
--- a/fs/hostfs/Makefile
+++ b/fs/hostfs/Makefile
@@ -8,4 +8,4 @@ hostfs-objs := hostfs_kern.o hostfs_user.o
obj-y :=
obj-$(CONFIG_HOSTFS) += hostfs.o
-include arch/um/scripts/Makefile.rules
+include $(srctree)/arch/um/scripts/Makefile.rules
diff --git a/init/Kconfig b/init/Kconfig
index 8a27575895ece46f6ade9f3c855edeec5646f9cd..1fb5f313d18f0fa93739348c575b547be801ee40 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -682,10 +682,6 @@ config CPU_ISOLATION
source "kernel/rcu/Kconfig"
-config BUILD_BIN2C
- bool
- default n
-
config IKCONFIG
tristate "Kernel .config support"
help
diff --git a/kernel/gen_kheaders.sh b/kernel/gen_kheaders.sh
index 81b97f0f65564e9dafc66c89d8627c8429939306..1ef9a87511f5025d2774e3993b47af361b377a2e 100755
--- a/kernel/gen_kheaders.sh
+++ b/kernel/gen_kheaders.sh
@@ -7,7 +7,7 @@ set -e
sfile="$(readlink -f "$0")"
outdir="$(pwd)"
tarfile=$1
-cpio_dir=$outdir/$tarfile.tmp
+cpio_dir=$outdir/${tarfile%/*}/.tmp_cpio_dir
dir_list="
include/
diff --git a/rust/.gitignore b/rust/.gitignore
index 9bd1af8e05a16363e670db910b9e872b78cfb2ab..168cb26a31b99902f0e21d93062bf236898e9eff 100644
--- a/rust/.gitignore
+++ b/rust/.gitignore
@@ -1,6 +1,5 @@
# SPDX-License-Identifier: GPL-2.0
-target.json
bindings_generated.rs
bindings_helpers_generated.rs
exports_*_generated.h
diff --git a/rust/Makefile b/rust/Makefile
index 8a521f2b642201af46ba9d1ed071c921507c8ad7..f88d108fbef07adc1e039123e7855617cec6c426 100644
--- a/rust/Makefile
+++ b/rust/Makefile
@@ -1,8 +1,5 @@
# SPDX-License-Identifier: GPL-2.0
-always-$(CONFIG_RUST) += target.json
-no-clean-files += target.json
-
obj-$(CONFIG_RUST) += core.o compiler_builtins.o
always-$(CONFIG_RUST) += exports_core_generated.h
@@ -232,11 +229,6 @@ rusttest-kernel: $(src)/kernel/lib.rs rusttest-prepare \
$(call if_changed,rustc_test)
$(call if_changed,rustc_test_library)
-filechk_rust_target = $(objtree)/scripts/generate_rust_target < $<
-
-$(obj)/target.json: $(objtree)/include/config/auto.conf FORCE
- $(call filechk,rust_target)
-
ifdef CONFIG_CC_IS_CLANG
bindgen_c_flags = $(c_flags)
else
@@ -332,11 +324,9 @@ $(obj)/exports_kernel_generated.h: $(obj)/kernel.o FORCE
quiet_cmd_rustc_procmacro = $(RUSTC_OR_CLIPPY_QUIET) P $@
cmd_rustc_procmacro = \
$(RUSTC_OR_CLIPPY) $(rust_common_flags) \
- --emit=dep-info,link --extern proc_macro \
- --crate-type proc-macro --out-dir $(objtree)/$(obj) \
- --crate-name $(patsubst lib%.so,%,$(notdir $@)) $<; \
- mv $(objtree)/$(obj)/$(patsubst lib%.so,%,$(notdir $@)).d $(depfile); \
- sed -i '/^\#/d' $(depfile)
+ --emit=dep-info=$(depfile) --emit=link=$@ --extern proc_macro \
+ --crate-type proc-macro \
+ --crate-name $(patsubst lib%.so,%,$(notdir $@)) $<
# Procedural macros can only be used with the `rustc` that compiled it.
# Therefore, to get `libmacros.so` automatically recompiled when the compiler
@@ -349,11 +339,10 @@ quiet_cmd_rustc_library = $(if $(skip_clippy),RUSTC,$(RUSTC_OR_CLIPPY_QUIET)) L
OBJTREE=$(abspath $(objtree)) \
$(if $(skip_clippy),$(RUSTC),$(RUSTC_OR_CLIPPY)) \
$(filter-out $(skip_flags),$(rust_flags) $(rustc_target_flags)) \
- --emit=dep-info,obj,metadata --crate-type rlib \
- --out-dir $(objtree)/$(obj) -L$(objtree)/$(obj) \
- --crate-name $(patsubst %.o,%,$(notdir $@)) $<; \
- mv $(objtree)/$(obj)/$(patsubst %.o,%,$(notdir $@)).d $(depfile); \
- sed -i '/^\#/d' $(depfile) \
+ --emit=dep-info=$(depfile) --emit=obj=$@ \
+ --emit=metadata=$(dir $@)$(patsubst %.o,lib%.rmeta,$(notdir $@)) \
+ --crate-type rlib -L$(objtree)/$(obj) \
+ --crate-name $(patsubst %.o,%,$(notdir $@)) $< \
$(if $(rustc_objcopy),;$(OBJCOPY) $(rustc_objcopy) $@)
rust-analyzer:
@@ -377,7 +366,7 @@ $(obj)/core.o: private skip_clippy = 1
$(obj)/core.o: private skip_flags = -Dunreachable_pub
$(obj)/core.o: private rustc_objcopy = $(foreach sym,$(redirect-intrinsics),--redefine-sym $(sym)=__rust$(sym))
$(obj)/core.o: private rustc_target_flags = $(core-cfgs)
-$(obj)/core.o: $(RUST_LIB_SRC)/core/src/lib.rs $(obj)/target.json FORCE
+$(obj)/core.o: $(RUST_LIB_SRC)/core/src/lib.rs scripts/target.json FORCE
$(call if_changed_dep,rustc_library)
$(obj)/compiler_builtins.o: private rustc_objcopy = -w -W '__*'
diff --git a/scripts/.gitignore b/scripts/.gitignore
index b7aec8eb1bd443dbd4dd189868f321e329fbc4be..feb43045d1b1ed84bab049b98cd50af88d3643cc 100644
--- a/scripts/.gitignore
+++ b/scripts/.gitignore
@@ -1,11 +1,12 @@
# SPDX-License-Identifier: GPL-2.0-only
/asn1_compiler
-/bin2c
/generate_rust_target
/insert-sys-cert
/kallsyms
+/list-gitignored
/module.lds
/recordmcount
/sign-file
/sorttable
+/target.json
/unifdef
diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index 2f7356b2990bbd98aee9455131e4cf46852bdbd0..7778cc97a4e042cd763fb2f743e542a0c91d71ee 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -99,11 +99,11 @@ define filechk
$(check-FORCE)
$(Q)set -e; \
mkdir -p $(dir $@); \
- trap "rm -f $(dot-target).tmp" EXIT; \
- { $(filechk_$(1)); } > $(dot-target).tmp; \
- if [ ! -r $@ ] || ! cmp -s $@ $(dot-target).tmp; then \
+ trap "rm -f $(tmp-target)" EXIT; \
+ { $(filechk_$(1)); } > $(tmp-target); \
+ if [ ! -r $@ ] || ! cmp -s $@ $(tmp-target); then \
$(kecho) ' UPD $@'; \
- mv -f $(dot-target).tmp $@; \
+ mv -f $(tmp-target) $@; \
fi
endef
@@ -125,15 +125,15 @@ dtbinst := -f $(srctree)/scripts/Makefile.dtbinst obj
# $(Q)$(MAKE) $(clean)=dir
clean := -f $(srctree)/scripts/Makefile.clean obj
-# echo command.
-# Short version is used, if $(quiet) equals `quiet_', otherwise full one.
-echo-cmd = $(if $($(quiet)cmd_$(1)),\
- echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
-
-# sink stdout for 'make -s'
- redirect :=
- quiet_redirect :=
-silent_redirect := exec >/dev/null;
+# pring log
+#
+# If quiet is "silent_", print nothing and sink stdout
+# If quiet is "quiet_", print short log
+# If quiet is empty, print short log and whole command
+silent_log_print = exec >/dev/null;
+ quiet_log_print = $(if $(quiet_cmd_$1), echo ' $(call escsq,$(quiet_cmd_$1)$(why))';)
+ log_print = echo '$(pound) $(call escsq,$(or $(quiet_cmd_$1),cmd_$1 $@)$(why))'; \
+ echo ' $(call escsq,$(cmd_$1))';
# Delete the target on interruption
#
@@ -156,8 +156,8 @@ delete-on-interrupt = \
$(foreach sig, HUP INT QUIT TERM PIPE, \
trap 'rm -f $@; trap - $(sig); kill -s $(sig) $$$$' $(sig);))
-# printing commands
-cmd = @set -e; $(echo-cmd) $($(quiet)redirect) $(delete-on-interrupt) $(cmd_$(1))
+# print and execute commands
+cmd = @$(if $(cmd_$(1)),set -e; $($(quiet)log_print) $(delete-on-interrupt) $(cmd_$(1)),:)
###
# if_changed - execute command if any prerequisite is newer than
@@ -170,10 +170,14 @@ cmd = @set -e; $(echo-cmd) $($(quiet)redirect) $(delete-on-interrupt) $(cmd_$(1)
ifneq ($(KBUILD_NOCMDDEP),1)
# Check if both commands are the same including their order. Result is empty
# string if equal. User may override this check using make KBUILD_NOCMDDEP=1
-cmd-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \
+# If the target does not exist, the *.cmd file should not be included so
+# $(savedcmd_$@) gets empty. Then, target will be built even if $(newer-prereqs)
+# happens to become empty.
+cmd-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(savedcmd_$@))), \
$(subst $(space),$(space_escape),$(strip $(cmd_$1))))
else
-cmd-check = $(if $(strip $(cmd_$@)),,1)
+# We still need to detect missing targets.
+cmd-check = $(if $(strip $(savedcmd_$@)),,1)
endif
# Replace >$< with >$$< to preserve $ when reloading the .cmd file
@@ -186,6 +190,8 @@ make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1))))
# Find any prerequisites that are newer than target or that do not exist.
# PHONY targets skipped in both cases.
+# If there is no prerequisite other than phony targets, $(newer-prereqs) becomes
+# empty even if the target does not exist. cmd-check saves this corner case.
newer-prereqs = $(filter-out $(PHONY),$?)
# It is a typical mistake to forget the FORCE prerequisite. Check it here so
@@ -199,7 +205,7 @@ if_changed = $(if $(if-changed-cond),$(cmd_and_savecmd),@:)
cmd_and_savecmd = \
$(cmd); \
- printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd
+ printf '%s\n' 'savedcmd_$@ := $(make-cmd)' > $(dot-target).cmd
# Execute the command and also postprocess generated .d dependencies file.
if_changed_dep = $(if $(if-changed-cond),$(cmd_and_fixdep),@:)
@@ -233,13 +239,13 @@ if_changed_rule = $(if $(if-changed-cond),$(rule_$(1)),@:)
# (5) No dir/.target.cmd file (used to store command line)
# (6) No dir/.target.cmd file and target not listed in $(targets)
# This is a good hint that there is a bug in the kbuild file
-ifeq ($(KBUILD_VERBOSE),2)
-why = \
+ifneq ($(findstring 2, $(KBUILD_VERBOSE)),)
+_why = \
$(if $(filter $@, $(PHONY)),- due to target is PHONY, \
$(if $(wildcard $@), \
$(if $(newer-prereqs),- due to: $(newer-prereqs), \
$(if $(cmd-check), \
- $(if $(cmd_$@),- due to command line change, \
+ $(if $(savedcmd_$@),- due to command line change, \
$(if $(filter $@, $(targets)), \
- due to missing .cmd file, \
- due to $(notdir $@) not in $$(targets) \
@@ -251,7 +257,7 @@ why = \
) \
)
-echo-why = $(call escsq, $(strip $(why)))
+why = $(space)$(strip $(_why))
endif
###############################################################################
diff --git a/scripts/Kconfig.include b/scripts/Kconfig.include
index 274125307ebd75f32f9a65c8ea02106769b30257..5a84b6443875c47013348bfed85ebefe8c6da4db 100644
--- a/scripts/Kconfig.include
+++ b/scripts/Kconfig.include
@@ -33,7 +33,7 @@ ld-option = $(success,$(LD) -v $(1))
# $(as-instr,<instr>)
# Return y if the assembler supports <instr>, n otherwise
-as-instr = $(success,printf "%b\n" "$(1)" | $(CC) $(CLANG_FLAGS) -c -x assembler -o /dev/null -)
+as-instr = $(success,printf "%b\n" "$(1)" | $(CC) $(CLANG_FLAGS) -c -x assembler-with-cpp -o /dev/null -)
# check if $(CC) and $(LD) exist
$(error-if,$(failure,command -v $(CC)),C compiler '$(CC)' not found)
diff --git a/scripts/Makefile b/scripts/Makefile
index 1575af84d557bdbf56e8c7b7772c54d2e2a3ab3e..e8917975905ca65973bc2e1e005a53006c08e5a3 100644
--- a/scripts/Makefile
+++ b/scripts/Makefile
@@ -3,15 +3,20 @@
# scripts contains sources for various helper programs used throughout
# the kernel for the build process.
-hostprogs-always-$(CONFIG_BUILD_BIN2C) += bin2c
hostprogs-always-$(CONFIG_KALLSYMS) += kallsyms
hostprogs-always-$(BUILD_C_RECORDMCOUNT) += recordmcount
hostprogs-always-$(CONFIG_BUILDTIME_TABLE_SORT) += sorttable
hostprogs-always-$(CONFIG_ASN1) += asn1_compiler
hostprogs-always-$(CONFIG_MODULE_SIG_FORMAT) += sign-file
hostprogs-always-$(CONFIG_SYSTEM_EXTRA_CERTIFICATE) += insert-sys-cert
-hostprogs-always-$(CONFIG_RUST) += generate_rust_target
+always-$(CONFIG_RUST) += target.json
+filechk_rust_target = $< < include/config/auto.conf
+
+$(obj)/target.json: scripts/generate_rust_target include/config/auto.conf FORCE
+ $(call filechk,rust_target)
+
+hostprogs += generate_rust_target
generate_rust_target-rust := y
HOSTCFLAGS_sorttable.o = -I$(srctree)/tools/include
@@ -33,7 +38,7 @@ HOSTCFLAGS_sorttable.o += -DMCOUNT_SORT_ENABLED
endif
# The following programs are only built on demand
-hostprogs += unifdef
+hostprogs += list-gitignored unifdef
# The module linker script is preprocessed on demand
targets += module.lds
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index a0d5c6cca76ded48984bb25b703e0c51058b0fc7..76323201232a5402b8918fb4cbc27de20701a766 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -285,12 +285,9 @@ rust_common_cmd = \
-Zcrate-attr=no_std \
-Zcrate-attr='feature($(rust_allowed_features))' \
--extern alloc --extern kernel \
- --crate-type rlib --out-dir $(obj) -L $(objtree)/rust/ \
- --crate-name $(basename $(notdir $@))
-
-rust_handle_depfile = \
- mv $(obj)/$(basename $(notdir $@)).d $(depfile); \
- sed -i '/^\#/d' $(depfile)
+ --crate-type rlib -L $(objtree)/rust/ \
+ --crate-name $(basename $(notdir $@)) \
+ --emit=dep-info=$(depfile)
# `--emit=obj`, `--emit=asm` and `--emit=llvm-ir` imply a single codegen unit
# will be used. We explicitly request `-Ccodegen-units=1` in any case, and
@@ -301,34 +298,27 @@ rust_handle_depfile = \
# would not match each other.
quiet_cmd_rustc_o_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
- cmd_rustc_o_rs = \
- $(rust_common_cmd) --emit=dep-info,obj $<; \
- $(rust_handle_depfile)
+ cmd_rustc_o_rs = $(rust_common_cmd) --emit=obj=$@ $<
$(obj)/%.o: $(src)/%.rs FORCE
$(call if_changed_dep,rustc_o_rs)
quiet_cmd_rustc_rsi_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
cmd_rustc_rsi_rs = \
- $(rust_common_cmd) --emit=dep-info -Zunpretty=expanded $< >$@; \
- command -v $(RUSTFMT) >/dev/null && $(RUSTFMT) $@; \
- $(rust_handle_depfile)
+ $(rust_common_cmd) -Zunpretty=expanded $< >$@; \
+ command -v $(RUSTFMT) >/dev/null && $(RUSTFMT) $@
$(obj)/%.rsi: $(src)/%.rs FORCE
$(call if_changed_dep,rustc_rsi_rs)
quiet_cmd_rustc_s_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
- cmd_rustc_s_rs = \
- $(rust_common_cmd) --emit=dep-info,asm $<; \
- $(rust_handle_depfile)
+ cmd_rustc_s_rs = $(rust_common_cmd) --emit=asm=$@ $<
$(obj)/%.s: $(src)/%.rs FORCE
$(call if_changed_dep,rustc_s_rs)
quiet_cmd_rustc_ll_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
- cmd_rustc_ll_rs = \
- $(rust_common_cmd) --emit=dep-info,llvm-ir $<; \
- $(rust_handle_depfile)
+ cmd_rustc_ll_rs = $(rust_common_cmd) --emit=llvm-ir=$@ $<
$(obj)/%.ll: $(src)/%.rs FORCE
$(call if_changed_dep,rustc_ll_rs)
diff --git a/scripts/Makefile.clang b/scripts/Makefile.clang
index 87285b76adb240363053fec9cef81e6182d60a78..70b354fa1cb4c96b425f823acdb0e579c5db645b 100644
--- a/scripts/Makefile.clang
+++ b/scripts/Makefile.clang
@@ -36,6 +36,8 @@ endif
# so they can be implemented or wrapped in cc-option.
CLANG_FLAGS += -Werror=unknown-warning-option
CLANG_FLAGS += -Werror=ignored-optimization-argument
+CLANG_FLAGS += -Werror=option-ignored
+CLANG_FLAGS += -Werror=unused-command-line-argument
KBUILD_CFLAGS += $(CLANG_FLAGS)
KBUILD_AFLAGS += $(CLANG_FLAGS)
export CLANG_FLAGS
diff --git a/scripts/Makefile.compiler b/scripts/Makefile.compiler
index 3d8adfd34af1baf9e9155af660cdafa708000612..7aa1fbc4aafef69327bf3b0ca51a80c1d46492a0 100644
--- a/scripts/Makefile.compiler
+++ b/scripts/Makefile.compiler
@@ -29,16 +29,16 @@ try-run = $(shell set -e; \
fi)
# as-option
-# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
+# Usage: aflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
as-option = $(call try-run,\
- $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))
+ $(CC) -Werror $(KBUILD_AFLAGS) $(1) -c -x assembler-with-cpp /dev/null -o "$$TMP",$(1),$(2))
# as-instr
-# Usage: cflags-y += $(call as-instr,instr,option1,option2)
+# Usage: aflags-y += $(call as-instr,instr,option1,option2)
as-instr = $(call try-run,\
- printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
+ printf "%b\n" "$(1)" | $(CC) -Werror $(KBUILD_AFLAGS) -c -x assembler-with-cpp -o "$$TMP" -,$(2),$(3))
# __cc-option
# Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586)
diff --git a/scripts/Makefile.host b/scripts/Makefile.host
index da133780b7518dbcc028dee3c940e857e15a3284..7aea9005e497001cbf7c61d1085b3b05b11deb7d 100644
--- a/scripts/Makefile.host
+++ b/scripts/Makefile.host
@@ -80,25 +80,24 @@ host-rust := $(addprefix $(obj)/,$(host-rust))
#####
# Handle options to gcc. Support building with separate output directory
-_hostc_flags = $(KBUILD_HOSTCFLAGS) $(HOST_EXTRACFLAGS) \
+hostc_flags = -Wp,-MMD,$(depfile) \
+ $(KBUILD_HOSTCFLAGS) $(HOST_EXTRACFLAGS) \
$(HOSTCFLAGS_$(target-stem).o)
-_hostcxx_flags = $(KBUILD_HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
+hostcxx_flags = -Wp,-MMD,$(depfile) \
+ $(KBUILD_HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
$(HOSTCXXFLAGS_$(target-stem).o)
-_hostrust_flags = $(KBUILD_HOSTRUSTFLAGS) $(HOST_EXTRARUSTFLAGS) \
- $(HOSTRUSTFLAGS_$(target-stem))
+hostrust_flags = --emit=dep-info=$(depfile) \
+ $(KBUILD_HOSTRUSTFLAGS) $(HOST_EXTRARUSTFLAGS) \
+ $(HOSTRUSTFLAGS_$(target-stem))
# $(objtree)/$(obj) for including generated headers from checkin source files
ifeq ($(KBUILD_EXTMOD),)
ifdef building_out_of_srctree
-_hostc_flags += -I $(objtree)/$(obj)
-_hostcxx_flags += -I $(objtree)/$(obj)
+hostc_flags += -I $(objtree)/$(obj)
+hostcxx_flags += -I $(objtree)/$(obj)
endif
endif
-hostc_flags = -Wp,-MMD,$(depfile) $(_hostc_flags)
-hostcxx_flags = -Wp,-MMD,$(depfile) $(_hostcxx_flags)
-hostrust_flags = $(_hostrust_flags)
-
#####
# Compile programs on the host
@@ -149,10 +148,7 @@ $(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
# host-rust -> Executable
quiet_cmd_host-rust = HOSTRUSTC $@
cmd_host-rust = \
- $(HOSTRUSTC) $(hostrust_flags) --emit=dep-info,link \
- --out-dir=$(obj)/ $<; \
- mv $(obj)/$(target-stem).d $(depfile); \
- sed -i '/^\#/d' $(depfile)
+ $(HOSTRUSTC) $(hostrust_flags) --emit=link=$@ $<
$(host-rust): $(obj)/%: $(src)/%.rs FORCE
$(call if_changed_dep,host-rust)
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 4a4a5f67c1a6c68a60c624fd687bf6adf367cb2c..100a386fcd7173034bf6172b19fc64611a6130c1 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -368,40 +368,25 @@ DTC_FLAGS += $(DTC_FLAGS_$(basetarget))
DTC_FLAGS += $(if $(filter $(patsubst $(obj)/%,%,$@), $(base-dtb-y)), -@)
# Generate an assembly file to wrap the output of the device tree compiler
-quiet_cmd_dt_S_dtb= DTBS $@
-cmd_dt_S_dtb= \
-{ \
- echo '\#include <asm-generic/vmlinux.lds.h>'; \
- echo '.section .dtb.init.rodata,"a"'; \
- echo '.balign STRUCT_ALIGNMENT'; \
- echo '.global __dtb_$(subst -,_,$(*F))_begin'; \
- echo '__dtb_$(subst -,_,$(*F))_begin:'; \
- echo '.incbin "$<" '; \
- echo '__dtb_$(subst -,_,$(*F))_end:'; \
- echo '.global __dtb_$(subst -,_,$(*F))_end'; \
- echo '.balign STRUCT_ALIGNMENT'; \
-} > $@
+quiet_cmd_wrap_S_dtb = WRAP $@
+ cmd_wrap_S_dtb = { \
+ symbase=__$(patsubst .%,%,$(suffix $<))_$(subst -,_,$(notdir $*)); \
+ echo '\#include <asm-generic/vmlinux.lds.h>'; \
+ echo '.section .dtb.init.rodata,"a"'; \
+ echo '.balign STRUCT_ALIGNMENT'; \
+ echo ".global $${symbase}_begin"; \
+ echo "$${symbase}_begin:"; \
+ echo '.incbin "$<" '; \
+ echo ".global $${symbase}_end"; \
+ echo "$${symbase}_end:"; \
+ echo '.balign STRUCT_ALIGNMENT'; \
+ } > $@
$(obj)/%.dtb.S: $(obj)/%.dtb FORCE
- $(call if_changed,dt_S_dtb)
-
-# Generate an assembly file to wrap the output of the device tree compiler
-quiet_cmd_dt_S_dtbo= DTBOS $@
-cmd_dt_S_dtbo= \
-{ \
- echo '\#include <asm-generic/vmlinux.lds.h>'; \
- echo '.section .dtb.init.rodata,"a"'; \
- echo '.balign STRUCT_ALIGNMENT'; \
- echo '.global __dtbo_$(subst -,_,$(*F))_begin'; \
- echo '__dtbo_$(subst -,_,$(*F))_begin:'; \
- echo '.incbin "$<" '; \
- echo '__dtbo_$(subst -,_,$(*F))_end:'; \
- echo '.global __dtbo_$(subst -,_,$(*F))_end'; \
- echo '.balign STRUCT_ALIGNMENT'; \
-} > $@
+ $(call if_changed,wrap_S_dtb)
$(obj)/%.dtbo.S: $(obj)/%.dtbo FORCE
- $(call if_changed,dt_S_dtbo)
+ $(call if_changed,wrap_S_dtb)
quiet_cmd_dtc = DTC $@
cmd_dtc = $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
diff --git a/scripts/Makefile.modfinal b/scripts/Makefile.modfinal
index a30d5b08eee94515aadea51422c084355ac9dd38..4703f652c00986c9fe258d081e029ec1c497db37 100644
--- a/scripts/Makefile.modfinal
+++ b/scripts/Makefile.modfinal
@@ -54,7 +54,7 @@ newer_prereqs_except = $(filter-out $(PHONY) $(1),$?)
# Same as if_changed, but allows to exclude specified extra dependencies
if_changed_except = $(if $(call newer_prereqs_except,$(2))$(cmd-check), \
$(cmd); \
- printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
+ printf '%s\n' 'savedcmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
# Re-generate module BTFs if either module's .ko or vmlinux changed
%.ko: %.o %.mod.o scripts/module.lds $(and $(CONFIG_DEBUG_INFO_BTF_MODULES),$(KBUILD_BUILTIN),vmlinux) FORCE
diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
index 43343e13c5425579a0ba6cd3da01970e3580bc30..0980c58d8afc8f77cafd5623fae9f7be0ea526b6 100644
--- a/scripts/Makefile.modpost
+++ b/scripts/Makefile.modpost
@@ -121,16 +121,14 @@ modpost-args += -e $(addprefix -i , $(KBUILD_EXTRA_SYMBOLS))
endif # ($(KBUILD_EXTMOD),)
-ifneq ($(missing-input),)
-modpost-args += -w
-endif
-
quiet_cmd_modpost = MODPOST $@
cmd_modpost = \
$(if $(missing-input), \
echo >&2 "WARNING: $(missing-input) is missing."; \
echo >&2 " Modules may not have dependencies or modversions."; \
- echo >&2 " You may get many unresolved symbol warnings.";) \
+ echo >&2 " You may get many unresolved symbol errors."; \
+ echo >&2 " You can set KBUILD_MODPOST_WARN=1 to turn errors into warning"; \
+ echo >&2 " if you want to proceed at your own risk.";) \
$(MODPOST) $(modpost-args)
targets += $(output-symdump)
diff --git a/scripts/Makefile.package b/scripts/Makefile.package
index 525a2820976fd06c9fd278c9495978bcfce22160..b941e6341b364f26cba7555a56a9390745656e71 100644
--- a/scripts/Makefile.package
+++ b/scripts/Makefile.package
@@ -3,36 +3,13 @@
include $(srctree)/scripts/Kbuild.include
-# RPM target
-# ---------------------------------------------------------------------------
-# The rpm target generates two rpm files:
-# /usr/src/packages/SRPMS/kernel-2.6.7rc2-1.src.rpm
-# /usr/src/packages/RPMS/i386/kernel-2.6.7rc2-1.<arch>.rpm
-# The src.rpm files includes all source for the kernel being built
-# The <arch>.rpm includes kernel configuration, modules etc.
-#
-# Process to create the rpm files
-# a) clean the kernel
-# b) Generate .spec file
-# c) Build a tar ball, using symlink to make kernel version
-# first entry in the path
-# d) and pack the result to a tar.gz file
-# e) generate the rpm files, based on kernel.spec
-# - Use /. to avoid tar packing just the symlink
-
-# Note that the rpm-pkg target cannot be used with KBUILD_OUTPUT,
-# but the binrpm-pkg target can; for some reason O= gets ignored.
-
-# Remove hyphens since they have special meaning in RPM filenames
KERNELPATH := kernel-$(subst -,_,$(KERNELRELEASE))
-KDEB_SOURCENAME ?= linux-upstream
KBUILD_PKG_ROOTCMD ?="fakeroot -u"
-export KDEB_SOURCENAME
# Include only those top-level files that are needed by make, plus the GPL copy
TAR_CONTENT := Documentation LICENSES arch block certs crypto drivers fs \
include init io_uring ipc kernel lib mm net rust \
samples scripts security sound tools usr virt \
- .config .scmversion Makefile \
+ .config Makefile \
Kbuild Kconfig COPYING $(wildcard localversion*)
MKSPEC := $(srctree)/scripts/package/mkspec
@@ -42,35 +19,77 @@ if test "$(objtree)" != "$(srctree)"; then \
echo >&2; \
echo >&2 " ERROR:"; \
echo >&2 " Building source tarball is not possible outside the"; \
- echo >&2 " kernel source tree. Don't set KBUILD_OUTPUT, or use the"; \
- echo >&2 " binrpm-pkg or bindeb-pkg target instead."; \
+ echo >&2 " kernel source tree. Don't set KBUILD_OUTPUT"; \
echo >&2; \
false; \
fi ; \
-$(srctree)/scripts/setlocalversion --save-scmversion; \
tar -I $(KGZIP) -c $(RCS_TAR_IGNORE) -f $(2).tar.gz \
- --transform 's:^:$(2)/:S' $(TAR_CONTENT) $(3); \
-rm -f $(objtree)/.scmversion
+ --transform 's:^:$(2)/:S' $(TAR_CONTENT) $(3)
+
+# .tmp_filelist .tmp_filelist_exclude
+# ---------------------------------------------------------------------------
+
+scripts/list-gitignored: FORCE
+ $(Q)$(MAKE) -f $(srctree)/Makefile scripts_package
+
+# 1f5d3a6b6532e25a5cdf1f311956b2b03d343a48 removed '*.rej' from .gitignore,
+# but it is definitely a generated file.
+filechk_filelist = \
+ $< --exclude='*.rej' --output=$@_exclude --prefix=./ --rootdir=$(srctree) --stat=-
+
+.tmp_filelist: scripts/list-gitignored FORCE
+ $(call filechk,filelist)
+
+# tarball
+# ---------------------------------------------------------------------------
+
+quiet_cmd_tar = TAR $@
+ cmd_tar = tar -c -f $@ $(tar-compress-opt) $(tar-exclude-opt) \
+ --owner=0 --group=0 --sort=name \
+ --transform 's:^\.:$*:S' -C $(tar-rootdir) .
+
+tar-rootdir := $(srctree)
+
+%.tar:
+ $(call cmd,tar)
+
+%.tar.gz: private tar-compress-opt := -I $(KGZIP)
+%.tar.gz:
+ $(call cmd,tar)
+
+%.tar.bz2: private tar-compress-opt := -I $(KBZIP2)
+%.tar.bz2:
+ $(call cmd,tar)
+
+%.tar.xz: private tar-compress-opt := -I $(XZ)
+%.tar.xz:
+ $(call cmd,tar)
+
+%.tar.zst: private tar-compress-opt := -I $(ZSTD)
+%.tar.zst:
+ $(call cmd,tar)
+
+# Linux source tarball
+# ---------------------------------------------------------------------------
+
+linux.tar.gz: tar-exclude-opt = --exclude=./$@ --exclude-from=$<_exclude
+linux.tar.gz: .tmp_filelist
# rpm-pkg
# ---------------------------------------------------------------------------
PHONY += rpm-pkg
-rpm-pkg:
- $(MAKE) clean
- $(CONFIG_SHELL) $(MKSPEC) >$(objtree)/kernel.spec
- $(call cmd,src_tar,$(KERNELPATH),kernel.spec)
- +rpmbuild $(RPMOPTS) --target $(UTS_MACHINE)-linux -ta $(KERNELPATH).tar.gz \
+rpm-pkg: srpm = $(shell rpmspec --srpm --query --queryformat='%{name}-%{VERSION}-%{RELEASE}.src.rpm' kernel.spec)
+rpm-pkg: srcrpm-pkg
+ +rpmbuild $(RPMOPTS) --target $(UTS_MACHINE)-linux -rb $(srpm) \
--define='_smp_mflags %{nil}'
# srcrpm-pkg
# ---------------------------------------------------------------------------
PHONY += srcrpm-pkg
-srcrpm-pkg:
- $(MAKE) clean
+srcrpm-pkg: linux.tar.gz
$(CONFIG_SHELL) $(MKSPEC) >$(objtree)/kernel.spec
- $(call cmd,src_tar,$(KERNELPATH),kernel.spec)
- +rpmbuild $(RPMOPTS) --target $(UTS_MACHINE)-linux -ts $(KERNELPATH).tar.gz \
- --define='_smp_mflags %{nil}' --define='_srcrpmdir $(srctree)'
+ +rpmbuild $(RPMOPTS) --target $(UTS_MACHINE)-linux -bs kernel.spec \
+ --define='_smp_mflags %{nil}' --define='_sourcedir .' --define='_srcrpmdir .'
# binrpm-pkg
# ---------------------------------------------------------------------------
@@ -81,18 +100,30 @@ binrpm-pkg:
+rpmbuild $(RPMOPTS) --define "_builddir $(objtree)" --target \
$(UTS_MACHINE)-linux -bb $(objtree)/binkernel.spec
+quiet_cmd_debianize = GEN $@
+ cmd_debianize = $(srctree)/scripts/package/mkdebian
+
+debian: FORCE
+ $(call cmd,debianize)
+
+PHONY += debian-orig
+debian-orig: private source = $(shell dpkg-parsechangelog -S Source)
+debian-orig: private version = $(shell dpkg-parsechangelog -S Version | sed 's/-[^-]*$$//')
+debian-orig: private orig-name = $(source)_$(version).orig.tar.gz
+debian-orig: linux.tar.gz debian
+ $(Q)if [ "$(df --output=target .. 2>/dev/null)" = "$(df --output=target $< 2>/dev/null)" ]; then \
+ ln -f $< ../$(orig-name); \
+ else \
+ cp $< ../$(orig-name); \
+ fi
+
PHONY += deb-pkg
-deb-pkg:
- $(MAKE) clean
- $(CONFIG_SHELL) $(srctree)/scripts/package/mkdebian
- $(call cmd,src_tar,$(KDEB_SOURCENAME))
- origversion=$$(dpkg-parsechangelog -SVersion |sed 's/-[^-]*$$//');\
- mv $(KDEB_SOURCENAME).tar.gz ../$(KDEB_SOURCENAME)_$${origversion}.orig.tar.gz
- +dpkg-buildpackage -r$(KBUILD_PKG_ROOTCMD) -a$$(cat debian/arch) $(DPKG_FLAGS) -i.git -us -uc
+deb-pkg: debian-orig
+ +dpkg-buildpackage -r$(KBUILD_PKG_ROOTCMD) -a$$(cat debian/arch) $(DPKG_FLAGS) \
+ --build=source,binary -nc -us -uc
PHONY += bindeb-pkg
-bindeb-pkg:
- $(CONFIG_SHELL) $(srctree)/scripts/package/mkdebian
+bindeb-pkg: debian
+dpkg-buildpackage -r$(KBUILD_PKG_ROOTCMD) -a$$(cat debian/arch) $(DPKG_FLAGS) -b -nc -uc
PHONY += intdeb-pkg
@@ -114,44 +145,77 @@ snap-pkg:
cd $(objtree)/snap && \
snapcraft --target-arch=$(UTS_MACHINE)
-# tarball targets
+# dir-pkg tar*-pkg - tarball targets
# ---------------------------------------------------------------------------
-tar-pkgs := dir-pkg tar-pkg targz-pkg tarbz2-pkg tarxz-pkg tarzst-pkg
-PHONY += $(tar-pkgs)
-$(tar-pkgs):
- $(MAKE) -f $(srctree)/Makefile
- +$(CONFIG_SHELL) $(srctree)/scripts/package/buildtar $@
-# perf-pkg - generate a source tarball with perf source
+tar-pkg-tarball = linux-$(KERNELRELEASE)-$(ARCH).$(1)
+tar-pkg-phony = $(subst .,,$(1))-pkg
+
+tar-install: FORCE
+ $(Q)$(MAKE) -f $(srctree)/Makefile
+ +$(Q)$(srctree)/scripts/package/buildtar $@
+
+PHONY += dir-pkg
+dir-pkg: tar-install
+ @echo "Kernel tree successfully created in $<"
+
+define tar-pkg-rule
+PHONY += $(tar-pkg-phony)
+$(tar-pkg-phony): $(tar-pkg-tarball)
+ @:
+
+$(tar-pkg-tarball): private tar-rootdir := tar-install
+$(tar-pkg-tarball): tar-install
+endef
+
+$(foreach x, tar tar.gz tar.bz2 tar.xz tar.zst, $(eval $(call tar-pkg-rule,$(x))))
+
+# perf-tar*-src-pkg - generate a source tarball with perf source
# ---------------------------------------------------------------------------
-perf-tar=perf-$(KERNELVERSION)
-
-quiet_cmd_perf_tar = TAR
- cmd_perf_tar = \
-git --git-dir=$(srctree)/.git archive --prefix=$(perf-tar)/ \
- HEAD^{tree} $$(cd $(srctree); \
- echo $$(cat tools/perf/MANIFEST)) \
- -o $(perf-tar).tar; \
-mkdir -p $(perf-tar); \
-git --git-dir=$(srctree)/.git rev-parse HEAD > $(perf-tar)/HEAD; \
-(cd $(srctree)/tools/perf; \
-util/PERF-VERSION-GEN $(CURDIR)/$(perf-tar)/); \
-tar rf $(perf-tar).tar $(perf-tar)/HEAD $(perf-tar)/PERF-VERSION-FILE; \
-rm -r $(perf-tar); \
-$(if $(findstring tar-src,$@),, \
-$(if $(findstring bz2,$@),$(KBZIP2), \
-$(if $(findstring gz,$@),$(KGZIP), \
-$(if $(findstring xz,$@),$(XZ), \
-$(if $(findstring zst,$@),$(ZSTD), \
-$(error unknown target $@))))) \
- -f -9 $(perf-tar).tar)
-
-perf-tar-pkgs := perf-tar-src-pkg perf-targz-src-pkg perf-tarbz2-src-pkg \
- perf-tarxz-src-pkg perf-tarzst-src-pkg
-PHONY += $(perf-tar-pkgs)
-$(perf-tar-pkgs):
- $(call cmd,perf_tar)
+perf-tar-src-pkg-tarball = perf-$(KERNELVERSION).$(1)
+perf-tar-src-pkg-phony = perf-$(subst .,,$(1))-src-pkg
+
+quiet_cmd_stage_perf_src = STAGE $@
+ cmd_stage_perf_src = \
+ rm -rf $@; \
+ mkdir -p $@; \
+ tar -c -f - --exclude-from=$<_exclude -C $(srctree) --files-from=$(srctree)/tools/perf/MANIFEST | \
+ tar -x -f - -C $@
+
+.tmp_perf: .tmp_filelist
+ $(call cmd,stage_perf_src)
+
+filechk_perf_head = \
+ if test -z "$(git -C $(srctree) rev-parse --show-cdup 2>/dev/null)" && \
+ head=$$(git -C $(srctree) rev-parse --verify HEAD 2>/dev/null); then \
+ echo $$head; \
+ else \
+ echo "not a git tree"; \
+ fi
+
+.tmp_perf/HEAD: .tmp_perf FORCE
+ $(call filechk,perf_head)
+
+quiet_cmd_perf_version_file = GEN $@
+ cmd_perf_version_file = cd $(srctree)/tools/perf; util/PERF-VERSION-GEN $(dir $(abspath $@))
+
+# PERF-VERSION-FILE and HEAD are independent, but this avoids updating the
+# timestamp of PERF-VERSION-FILE.
+# The best is to fix tools/perf/util/PERF-VERSION-GEN.
+.tmp_perf/PERF-VERSION-FILE: .tmp_perf/HEAD $(srctree)/tools/perf/util/PERF-VERSION-GEN
+ $(call cmd,perf_version_file)
+
+define perf-tar-src-pkg-rule
+PHONY += $(perf-tar-src-pkg-phony)
+$(perf-tar-src-pkg-phony): $(perf-tar-src-pkg-tarball)
+ @:
+
+$(perf-tar-src-pkg-tarball): private tar-rootdir := .tmp_perf
+$(perf-tar-src-pkg-tarball): .tmp_filelist .tmp_perf/HEAD .tmp_perf/PERF-VERSION-FILE
+endef
+
+$(foreach x, tar tar.gz tar.bz2 tar.xz tar.zst, $(eval $(call perf-tar-src-pkg-rule,$(x))))
# Help text displayed when executing 'make help'
# ---------------------------------------------------------------------------
@@ -170,10 +234,13 @@ help:
@echo ' tarbz2-pkg - Build the kernel as a bzip2 compressed tarball'
@echo ' tarxz-pkg - Build the kernel as a xz compressed tarball'
@echo ' tarzst-pkg - Build the kernel as a zstd compressed tarball'
- @echo ' perf-tar-src-pkg - Build $(perf-tar).tar source tarball'
- @echo ' perf-targz-src-pkg - Build $(perf-tar).tar.gz source tarball'
- @echo ' perf-tarbz2-src-pkg - Build $(perf-tar).tar.bz2 source tarball'
- @echo ' perf-tarxz-src-pkg - Build $(perf-tar).tar.xz source tarball'
- @echo ' perf-tarzst-src-pkg - Build $(perf-tar).tar.zst source tarball'
+ @echo ' perf-tar-src-pkg - Build the perf source tarball with no compression'
+ @echo ' perf-targz-src-pkg - Build the perf source tarball with gzip compression'
+ @echo ' perf-tarbz2-src-pkg - Build the perf source tarball with bz2 compression'
+ @echo ' perf-tarxz-src-pkg - Build the perf source tarball with xz compression'
+ @echo ' perf-tarzst-src-pkg - Build the perf source tarball with zst compression'
+
+PHONY += FORCE
+FORCE:
.PHONY: $(PHONY)
diff --git a/scripts/as-version.sh b/scripts/as-version.sh
index 1a21495e9ff05077b6080c6bfb8fa2c1060067fa..af717476152d114134ad9365ec755ce5a2ea9087 100755
--- a/scripts/as-version.sh
+++ b/scripts/as-version.sh
@@ -45,7 +45,7 @@ orig_args="$@"
# Get the first line of the --version output.
IFS='
'
-set -- $(LC_ALL=C "$@" -Wa,--version -c -x assembler /dev/null -o /dev/null 2>/dev/null)
+set -- $(LC_ALL=C "$@" -Wa,--version -c -x assembler-with-cpp /dev/null -o /dev/null 2>/dev/null)
# Split the line on spaces.
IFS=' '
diff --git a/scripts/asn1_compiler.c b/scripts/asn1_compiler.c
index 71d4a7c87900890a04b3451450cbaab4be5f2ee7..7b6756a8c15d99440078dbfbb2b323abf376ed45 100644
--- a/scripts/asn1_compiler.c
+++ b/scripts/asn1_compiler.c
@@ -567,8 +567,8 @@ int main(int argc, char **argv)
int fd;
kbuild_verbose = getenv("KBUILD_VERBOSE");
- if (kbuild_verbose)
- verbose_opt = atoi(kbuild_verbose);
+ if (kbuild_verbose && strchr(kbuild_verbose, '1'))
+ verbose_opt = true;
while (argc > 4) {
if (strcmp(argv[1], "-v") == 0)
diff --git a/scripts/basic/fixdep.c b/scripts/basic/fixdep.c
index f932aeaba71a2e7696c9083896ac441d06ca08fa..fa562806c2bebed28b9bf68d251880dd1252d47d 100644
--- a/scripts/basic/fixdep.c
+++ b/scripts/basic/fixdep.c
@@ -70,7 +70,7 @@
*
* It first generates a line
*
- * cmd_<target> = <cmdline>
+ * savedcmd_<target> = <cmdline>
*
* and then basically copies the .<target>.d file to stdout, in the
* process filtering out the dependency on autoconf.h and adding
@@ -94,6 +94,7 @@
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
+#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
@@ -112,7 +113,7 @@ struct item {
};
#define HASHSZ 256
-static struct item *hashtab[HASHSZ];
+static struct item *config_hashtab[HASHSZ], *file_hashtab[HASHSZ];
static unsigned int strhash(const char *str, unsigned int sz)
{
@@ -124,25 +125,11 @@ static unsigned int strhash(const char *str, unsigned int sz)
return hash;
}
-/*
- * Lookup a value in the configuration string.
- */
-static int is_defined_config(const char *name, int len, unsigned int hash)
-{
- struct item *aux;
-
- for (aux = hashtab[hash % HASHSZ]; aux; aux = aux->next) {
- if (aux->hash == hash && aux->len == len &&
- memcmp(aux->name, name, len) == 0)
- return 1;
- }
- return 0;
-}
-
/*
* Add a new value to the configuration string.
*/
-static void define_config(const char *name, int len, unsigned int hash)
+static void add_to_hashtable(const char *name, int len, unsigned int hash,
+ struct item *hashtab[])
{
struct item *aux = malloc(sizeof(*aux) + len);
@@ -157,17 +144,34 @@ static void define_config(const char *name, int len, unsigned int hash)
hashtab[hash % HASHSZ] = aux;
}
+/*
+ * Lookup a string in the hash table. If found, just return true.
+ * If not, add it to the hashtable and return false.
+ */
+static bool in_hashtable(const char *name, int len, struct item *hashtab[])
+{
+ struct item *aux;
+ unsigned int hash = strhash(name, len);
+
+ for (aux = hashtab[hash % HASHSZ]; aux; aux = aux->next) {
+ if (aux->hash == hash && aux->len == len &&
+ memcmp(aux->name, name, len) == 0)
+ return true;
+ }
+
+ add_to_hashtable(name, len, hash, hashtab);
+
+ return false;
+}
+
/*
* Record the use of a CONFIG_* word.
*/
static void use_config(const char *m, int slen)
{
- unsigned int hash = strhash(m, slen);
-
- if (is_defined_config(m, slen, hash))
- return;
+ if (in_hashtable(m, slen, config_hashtab))
+ return;
- define_config(m, slen, hash);
/* Print out a dependency path from a symbol name. */
printf(" $(wildcard include/config/%.*s) \\\n", slen, m);
}
@@ -246,80 +250,158 @@ static int is_ignored_file(const char *s, int len)
str_ends_with(s, len, "include/generated/autoksyms.h");
}
+/* Do not parse these files */
+static int is_no_parse_file(const char *s, int len)
+{
+ /* rustc may list binary files in dep-info */
+ return str_ends_with(s, len, ".rlib") ||
+ str_ends_with(s, len, ".rmeta") ||
+ str_ends_with(s, len, ".so");
+}
+
/*
* Important: The below generated source_foo.o and deps_foo.o variable
* assignments are parsed not only by make, but also by the rather simple
* parser in scripts/mod/sumversion.c.
*/
-static void parse_dep_file(char *m, const char *target)
+static void parse_dep_file(char *p, const char *target)
{
- char *p;
- int is_last, is_target;
- int saw_any_target = 0;
- int is_first_dep = 0;
- void *buf;
-
- while (1) {
- /* Skip any "white space" */
- while (*m == ' ' || *m == '\\' || *m == '\n')
- m++;
-
- if (!*m)
+ bool saw_any_target = false;
+ bool is_target = true;
+ bool is_source = false;
+ bool need_parse;
+ char *q, saved_c;
+
+ while (*p) {
+ /* handle some special characters first. */
+ switch (*p) {
+ case '#':
+ /*
+ * skip comments.
+ * rustc may emit comments to dep-info.
+ */
+ p++;
+ while (*p != '\0' && *p != '\n') {
+ /*
+ * escaped newlines continue the comment across
+ * multiple lines.
+ */
+ if (*p == '\\')
+ p++;
+ p++;
+ }
+ continue;
+ case ' ':
+ case '\t':
+ /* skip whitespaces */
+ p++;
+ continue;
+ case '\\':
+ /*
+ * backslash/newline combinations continue the
+ * statement. Skip it just like a whitespace.
+ */
+ if (*(p + 1) == '\n') {
+ p += 2;
+ continue;
+ }
break;
-
- /* Find next "white space" */
- p = m;
- while (*p && *p != ' ' && *p != '\\' && *p != '\n')
+ case '\n':
+ /*
+ * Makefiles use a line-based syntax, where the newline
+ * is the end of a statement. After seeing a newline,
+ * we expect the next token is a target.
+ */
p++;
- is_last = (*p == '\0');
- /* Is the token we found a target name? */
- is_target = (*(p-1) == ':');
- /* Don't write any target names into the dependency file */
- if (is_target) {
- /* The /next/ file is the first dependency */
- is_first_dep = 1;
- } else if (!is_ignored_file(m, p - m)) {
- *p = '\0';
-
+ is_target = true;
+ continue;
+ case ':':
/*
- * Do not list the source file as dependency, so that
- * kbuild is not confused if a .c file is rewritten
- * into .S or vice versa. Storing it in source_* is
- * needed for modpost to compute srcversions.
+ * assume the first dependency after a colon as the
+ * source file.
*/
- if (is_first_dep) {
+ p++;
+ is_target = false;
+ is_source = true;
+ continue;
+ }
+
+ /* find the end of the token */
+ q = p;
+ while (*q != ' ' && *q != '\t' && *q != '\n' && *q != '#' && *q != ':') {
+ if (*q == '\\') {
/*
- * If processing the concatenation of multiple
- * dependency files, only process the first
- * target name, which will be the original
- * source name, and ignore any other target
- * names, which will be intermediate temporary
- * files.
+ * backslash/newline combinations work like as
+ * a whitespace, so this is the end of token.
*/
- if (!saw_any_target) {
- saw_any_target = 1;
- printf("source_%s := %s\n\n",
- target, m);
- printf("deps_%s := \\\n", target);
+ if (*(q + 1) == '\n')
+ break;
+
+ /* escaped special characters */
+ if (*(q + 1) == '#' || *(q + 1) == ':') {
+ memmove(p + 1, p, q - p);
+ p++;
}
- is_first_dep = 0;
- } else {
- printf(" %s \\\n", m);
+
+ q++;
}
- buf = read_file(m);
- parse_config_file(buf);
- free(buf);
+ if (*q == '\0')
+ break;
+ q++;
}
- if (is_last)
- break;
+ /* Just discard the target */
+ if (is_target) {
+ p = q;
+ continue;
+ }
+
+ saved_c = *q;
+ *q = '\0';
+ need_parse = false;
/*
- * Start searching for next token immediately after the first
- * "whitespace" character that follows this token.
+ * Do not list the source file as dependency, so that kbuild is
+ * not confused if a .c file is rewritten into .S or vice versa.
+ * Storing it in source_* is needed for modpost to compute
+ * srcversions.
*/
- m = p + 1;
+ if (is_source) {
+ /*
+ * The DT build rule concatenates multiple dep files.
+ * When processing them, only process the first source
+ * name, which will be the original one, and ignore any
+ * other source names, which will be intermediate
+ * temporary files.
+ *
+ * rustc emits the same dependency list for each
+ * emission type. It is enough to list the source name
+ * just once.
+ */
+ if (!saw_any_target) {
+ saw_any_target = true;
+ printf("source_%s := %s\n\n", target, p);
+ printf("deps_%s := \\\n", target);
+ need_parse = true;
+ }
+ } else if (!is_ignored_file(p, q - p) &&
+ !in_hashtable(p, q - p, file_hashtab)) {
+ printf(" %s \\\n", p);
+ need_parse = true;
+ }
+
+ if (need_parse && !is_no_parse_file(p, q - p)) {
+ void *buf;
+
+ buf = read_file(p);
+ parse_config_file(buf);
+ free(buf);
+ }
+
+ is_source = false;
+ *q = saved_c;
+ p = q;
}
if (!saw_any_target) {
@@ -343,7 +425,7 @@ int main(int argc, char *argv[])
target = argv[2];
cmdline = argv[3];
- printf("cmd_%s := %s\n\n", target, cmdline);
+ printf("savedcmd_%s := %s\n\n", target, cmdline);
buf = read_file(depfile);
parse_dep_file(buf, target);
diff --git a/scripts/bin2c.c b/scripts/bin2c.c
deleted file mode 100644
index c3d7eef3ad0619806e8b7069e097ca20406b56d8..0000000000000000000000000000000000000000
--- a/scripts/bin2c.c
+++ /dev/null
@@ -1,36 +0,0 @@
-/*
- * Unloved program to convert a binary on stdin to a C include on stdout
- *
- * Jan 1999 Matt Mackall <mpm@selenic.com>
- *
- * This software may be used and distributed according to the terms
- * of the GNU General Public License, incorporated herein by reference.
- */
-
-#include <stdio.h>
-
-int main(int argc, char *argv[])
-{
- int ch, total = 0;
-
- if (argc > 1)
- printf("const char %s[] %s=\n",
- argv[1], argc > 2 ? argv[2] : "");
-
- do {
- printf("\t\"");
- while ((ch = getchar()) != EOF) {
- total++;
- printf("\\x%02x", ch);
- if (total % 16 == 0)
- break;
- }
- printf("\"\n");
- } while (ch != EOF);
-
- if (argc > 1)
- printf("\t;\n\n#include <linux/types.h>\n\nconst size_t %s_size = %d;\n",
- argv[1], total);
-
- return 0;
-}
diff --git a/scripts/checkkconfigsymbols.py b/scripts/checkkconfigsymbols.py
index 217d21abc86e8d4e04e17ef8fdc7108b6656066f..36c920e713137377439dca62774d04a0613e7917 100755
--- a/scripts/checkkconfigsymbols.py
+++ b/scripts/checkkconfigsymbols.py
@@ -115,7 +115,7 @@ def parse_options():
return args
-def main():
+def print_undefined_symbols():
"""Main function of this module."""
args = parse_options()
@@ -467,5 +467,16 @@ def parse_kconfig_file(kfile):
return defined, references
+def main():
+ try:
+ print_undefined_symbols()
+ except BrokenPipeError:
+ # Python flushes standard streams on exit; redirect remaining output
+ # to devnull to avoid another BrokenPipeError at shutdown
+ devnull = os.open(os.devnull, os.O_WRONLY)
+ os.dup2(devnull, sys.stdout.fileno())
+ sys.exit(1) # Python exits with error code 1 on EPIPE
+
+
if __name__ == "__main__":
main()
diff --git a/scripts/clang-tools/gen_compile_commands.py b/scripts/clang-tools/gen_compile_commands.py
index 0227522959a45c7253ed13ca1950affcb4f55522..15ba56527acd85bb608118ea145c84606a42ab78 100755
--- a/scripts/clang-tools/gen_compile_commands.py
+++ b/scripts/clang-tools/gen_compile_commands.py
@@ -19,7 +19,7 @@ _DEFAULT_OUTPUT = 'compile_commands.json'
_DEFAULT_LOG_LEVEL = 'WARNING'
_FILENAME_PATTERN = r'^\..*\.cmd$'
-_LINE_PATTERN = r'^cmd_[^ ]*\.o := (.* )([^ ]*\.c) *(;|$)'
+_LINE_PATTERN = r'^savedcmd_[^ ]*\.o := (.* )([^ ]*\.c) *(;|$)'
_VALID_LOG_LEVELS = ['DEBUG', 'INFO', 'WARNING', 'ERROR', 'CRITICAL']
# The tools/ directory adopts a different build system, and produces .cmd
# files in a different format. Do not support it.
diff --git a/scripts/clang-tools/run-clang-tools.py b/scripts/clang-tools/run-clang-tools.py
index 56f2ec8f0f40a707df4265657664e4347bbf7bda..3266708a865869545f3957ab7880c86be151d766 100755
--- a/scripts/clang-tools/run-clang-tools.py
+++ b/scripts/clang-tools/run-clang-tools.py
@@ -61,14 +61,21 @@ def run_analysis(entry):
def main():
- args = parse_arguments()
+ try:
+ args = parse_arguments()
- lock = multiprocessing.Lock()
- pool = multiprocessing.Pool(initializer=init, initargs=(lock, args))
- # Read JSON data into the datastore variable
- with open(args.path, "r") as f:
- datastore = json.load(f)
- pool.map(run_analysis, datastore)
+ lock = multiprocessing.Lock()
+ pool = multiprocessing.Pool(initializer=init, initargs=(lock, args))
+ # Read JSON data into the datastore variable
+ with open(args.path, "r") as f:
+ datastore = json.load(f)
+ pool.map(run_analysis, datastore)
+ except BrokenPipeError:
+ # Python flushes standard streams on exit; redirect remaining output
+ # to devnull to avoid another BrokenPipeError at shutdown
+ devnull = os.open(os.devnull, os.O_WRONLY)
+ os.dup2(devnull, sys.stdout.fileno())
+ sys.exit(1) # Python exits with error code 1 on EPIPE
if __name__ == "__main__":
diff --git a/scripts/diffconfig b/scripts/diffconfig
index d5da5fa05d1d3c264775dbb5c960bc3f69cd8684..43f0f3d273ae7178086f03038780ba103fd9970b 100755
--- a/scripts/diffconfig
+++ b/scripts/diffconfig
@@ -65,7 +65,7 @@ def print_config(op, config, value, new_value):
else:
print(" %s %s -> %s" % (config, value, new_value))
-def main():
+def show_diff():
global merge_style
# parse command line args
@@ -129,4 +129,16 @@ def main():
for config in new:
print_config("+", config, None, b[config])
-main()
+def main():
+ try:
+ show_diff()
+ except BrokenPipeError:
+ # Python flushes standard streams on exit; redirect remaining output
+ # to devnull to avoid another BrokenPipeError at shutdown
+ devnull = os.open(os.devnull, os.O_WRONLY)
+ os.dup2(devnull, sys.stdout.fileno())
+ sys.exit(1) # Python exits with error code 1 on EPIPE
+
+
+if __name__ == '__main__':
+ main()
diff --git a/scripts/kernel-doc b/scripts/kernel-doc
index 5cf38abdaf9da8c59504f438e40f9faee71cf9b1..2486689ffc7b47a5f987a31cd88d7cd6e24ce2a6 100755
--- a/scripts/kernel-doc
+++ b/scripts/kernel-doc
@@ -175,8 +175,8 @@ my $declaration_start_line;
my ($type, $declaration_name, $return_type);
my ($newsection, $newcontents, $prototype, $brcount, %source_map);
-if (defined($ENV{'KBUILD_VERBOSE'})) {
- $verbose = "$ENV{'KBUILD_VERBOSE'}";
+if (defined($ENV{'KBUILD_VERBOSE'}) && $ENV{'KBUILD_VERBOSE'} =~ '1') {
+ $verbose = 1;
}
if (defined($ENV{'KCFLAGS'})) {
diff --git a/scripts/list-gitignored.c b/scripts/list-gitignored.c
new file mode 100644
index 0000000000000000000000000000000000000000..f9941f8dcd2b3a206e267d02873954dfeb8207ba
--- /dev/null
+++ b/scripts/list-gitignored.c
@@ -0,0 +1,1057 @@
+// SPDX-License-Identifier: GPL-2.0-only
+//
+// Traverse the source tree, parsing all .gitignore files, and print file paths
+// that are ignored by git.
+// The output is suitable to the --exclude-from option of tar.
+// This is useful until the --exclude-vcs-ignores option gets working correctly.
+//
+// Copyright (C) 2023 Masahiro Yamada <masahiroy@kernel.org>
+// (a lot of code imported from GIT)
+
+#include <assert.h>
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <getopt.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+// Imported from commit 23c56f7bd5f1667f8b793d796bf30e39545920f6 in GIT
+//
+//---------------------------(IMPORT FROM GIT BEGIN)---------------------------
+
+// Copied from environment.c
+
+static bool ignore_case;
+
+// Copied from git-compat-util.h
+
+/* Sane ctype - no locale, and works with signed chars */
+#undef isascii
+#undef isspace
+#undef isdigit
+#undef isalpha
+#undef isalnum
+#undef isprint
+#undef islower
+#undef isupper
+#undef tolower
+#undef toupper
+#undef iscntrl
+#undef ispunct
+#undef isxdigit
+
+static const unsigned char sane_ctype[256];
+#define GIT_SPACE 0x01
+#define GIT_DIGIT 0x02
+#define GIT_ALPHA 0x04
+#define GIT_GLOB_SPECIAL 0x08
+#define GIT_REGEX_SPECIAL 0x10
+#define GIT_PATHSPEC_MAGIC 0x20
+#define GIT_CNTRL 0x40
+#define GIT_PUNCT 0x80
+#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
+#define isascii(x) (((x) & ~0x7f) == 0)
+#define isspace(x) sane_istest(x,GIT_SPACE)
+#define isdigit(x) sane_istest(x,GIT_DIGIT)
+#define isalpha(x) sane_istest(x,GIT_ALPHA)
+#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
+#define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
+#define islower(x) sane_iscase(x, 1)
+#define isupper(x) sane_iscase(x, 0)
+#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
+#define iscntrl(x) (sane_istest(x,GIT_CNTRL))
+#define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
+ GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
+#define isxdigit(x) (hexval_table[(unsigned char)(x)] != -1)
+#define tolower(x) sane_case((unsigned char)(x), 0x20)
+#define toupper(x) sane_case((unsigned char)(x), 0)
+
+static inline int sane_case(int x, int high)
+{
+ if (sane_istest(x, GIT_ALPHA))
+ x = (x & ~0x20) | high;
+ return x;
+}
+
+static inline int sane_iscase(int x, int is_lower)
+{
+ if (!sane_istest(x, GIT_ALPHA))
+ return 0;
+
+ if (is_lower)
+ return (x & 0x20) != 0;
+ else
+ return (x & 0x20) == 0;
+}
+
+// Copied from ctype.c
+
+enum {
+ S = GIT_SPACE,
+ A = GIT_ALPHA,
+ D = GIT_DIGIT,
+ G = GIT_GLOB_SPECIAL, /* *, ?, [, \\ */
+ R = GIT_REGEX_SPECIAL, /* $, (, ), +, ., ^, {, | */
+ P = GIT_PATHSPEC_MAGIC, /* other non-alnum, except for ] and } */
+ X = GIT_CNTRL,
+ U = GIT_PUNCT,
+ Z = GIT_CNTRL | GIT_SPACE
+};
+
+static const unsigned char sane_ctype[256] = {
+ X, X, X, X, X, X, X, X, X, Z, Z, X, X, Z, X, X, /* 0.. 15 */
+ X, X, X, X, X, X, X, X, X, X, X, X, X, X, X, X, /* 16.. 31 */
+ S, P, P, P, R, P, P, P, R, R, G, R, P, P, R, P, /* 32.. 47 */
+ D, D, D, D, D, D, D, D, D, D, P, P, P, P, P, G, /* 48.. 63 */
+ P, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, /* 64.. 79 */
+ A, A, A, A, A, A, A, A, A, A, A, G, G, U, R, P, /* 80.. 95 */
+ P, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, /* 96..111 */
+ A, A, A, A, A, A, A, A, A, A, A, R, R, U, P, X, /* 112..127 */
+ /* Nothing in the 128.. range */
+};
+
+// Copied from hex.c
+
+static const signed char hexval_table[256] = {
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 00-07 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 08-0f */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 10-17 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 18-1f */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 20-27 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 28-2f */
+ 0, 1, 2, 3, 4, 5, 6, 7, /* 30-37 */
+ 8, 9, -1, -1, -1, -1, -1, -1, /* 38-3f */
+ -1, 10, 11, 12, 13, 14, 15, -1, /* 40-47 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 48-4f */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 50-57 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 58-5f */
+ -1, 10, 11, 12, 13, 14, 15, -1, /* 60-67 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 68-67 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 70-77 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 78-7f */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 80-87 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 88-8f */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 90-97 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 98-9f */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* a0-a7 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* a8-af */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* b0-b7 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* b8-bf */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* c0-c7 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* c8-cf */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* d0-d7 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* d8-df */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* e0-e7 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* e8-ef */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* f0-f7 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* f8-ff */
+};
+
+// Copied from wildmatch.h
+
+#define WM_CASEFOLD 1
+#define WM_PATHNAME 2
+
+#define WM_NOMATCH 1
+#define WM_MATCH 0
+#define WM_ABORT_ALL -1
+#define WM_ABORT_TO_STARSTAR -2
+
+// Copied from wildmatch.c
+
+typedef unsigned char uchar;
+
+// local modification: remove NEGATE_CLASS(2)
+
+#define CC_EQ(class, len, litmatch) ((len) == sizeof (litmatch)-1 \
+ && *(class) == *(litmatch) \
+ && strncmp((char*)class, litmatch, len) == 0)
+
+// local modification: simpilify macros
+#define ISBLANK(c) ((c) == ' ' || (c) == '\t')
+#define ISGRAPH(c) (isprint(c) && !isspace(c))
+#define ISPRINT(c) isprint(c)
+#define ISDIGIT(c) isdigit(c)
+#define ISALNUM(c) isalnum(c)
+#define ISALPHA(c) isalpha(c)
+#define ISCNTRL(c) iscntrl(c)
+#define ISLOWER(c) islower(c)
+#define ISPUNCT(c) ispunct(c)
+#define ISSPACE(c) isspace(c)
+#define ISUPPER(c) isupper(c)
+#define ISXDIGIT(c) isxdigit(c)
+
+/* Match pattern "p" against "text" */
+static int dowild(const uchar *p, const uchar *text, unsigned int flags)
+{
+ uchar p_ch;
+ const uchar *pattern = p;
+
+ for ( ; (p_ch = *p) != '\0'; text++, p++) {
+ int matched, match_slash, negated;
+ uchar t_ch, prev_ch;
+ if ((t_ch = *text) == '\0' && p_ch != '*')
+ return WM_ABORT_ALL;
+ if ((flags & WM_CASEFOLD) && ISUPPER(t_ch))
+ t_ch = tolower(t_ch);
+ if ((flags & WM_CASEFOLD) && ISUPPER(p_ch))
+ p_ch = tolower(p_ch);
+ switch (p_ch) {
+ case '\\':
+ /* Literal match with following character. Note that the test
+ * in "default" handles the p[1] == '\0' failure case. */
+ p_ch = *++p;
+ /* FALLTHROUGH */
+ default:
+ if (t_ch != p_ch)
+ return WM_NOMATCH;
+ continue;
+ case '?':
+ /* Match anything but '/'. */
+ if ((flags & WM_PATHNAME) && t_ch == '/')
+ return WM_NOMATCH;
+ continue;
+ case '*':
+ if (*++p == '*') {
+ const uchar *prev_p = p - 2;
+ while (*++p == '*') {}
+ if (!(flags & WM_PATHNAME))
+ /* without WM_PATHNAME, '*' == '**' */
+ match_slash = 1;
+ else if ((prev_p < pattern || *prev_p == '/') &&
+ (*p == '\0' || *p == '/' ||
+ (p[0] == '\\' && p[1] == '/'))) {
+ /*
+ * Assuming we already match 'foo/' and are at
+ * <star star slash>, just assume it matches
+ * nothing and go ahead match the rest of the
+ * pattern with the remaining string. This
+ * helps make foo/<*><*>/bar (<> because
+ * otherwise it breaks C comment syntax) match
+ * both foo/bar and foo/a/bar.
+ */
+ if (p[0] == '/' &&
+ dowild(p + 1, text, flags) == WM_MATCH)
+ return WM_MATCH;
+ match_slash = 1;
+ } else /* WM_PATHNAME is set */
+ match_slash = 0;
+ } else
+ /* without WM_PATHNAME, '*' == '**' */
+ match_slash = flags & WM_PATHNAME ? 0 : 1;
+ if (*p == '\0') {
+ /* Trailing "**" matches everything. Trailing "*" matches
+ * only if there are no more slash characters. */
+ if (!match_slash) {
+ if (strchr((char *)text, '/'))
+ return WM_NOMATCH;
+ }
+ return WM_MATCH;
+ } else if (!match_slash && *p == '/') {
+ /*
+ * _one_ asterisk followed by a slash
+ * with WM_PATHNAME matches the next
+ * directory
+ */
+ const char *slash = strchr((char*)text, '/');
+ if (!slash)
+ return WM_NOMATCH;
+ text = (const uchar*)slash;
+ /* the slash is consumed by the top-level for loop */
+ break;
+ }
+ while (1) {
+ if (t_ch == '\0')
+ break;
+ /*
+ * Try to advance faster when an asterisk is
+ * followed by a literal. We know in this case
+ * that the string before the literal
+ * must belong to "*".
+ * If match_slash is false, do not look past
+ * the first slash as it cannot belong to '*'.
+ */
+ if (!is_glob_special(*p)) {
+ p_ch = *p;
+ if ((flags & WM_CASEFOLD) && ISUPPER(p_ch))
+ p_ch = tolower(p_ch);
+ while ((t_ch = *text) != '\0' &&
+ (match_slash || t_ch != '/')) {
+ if ((flags & WM_CASEFOLD) && ISUPPER(t_ch))
+ t_ch = tolower(t_ch);
+ if (t_ch == p_ch)
+ break;
+ text++;
+ }
+ if (t_ch != p_ch)
+ return WM_NOMATCH;
+ }
+ if ((matched = dowild(p, text, flags)) != WM_NOMATCH) {
+ if (!match_slash || matched != WM_ABORT_TO_STARSTAR)
+ return matched;
+ } else if (!match_slash && t_ch == '/')
+ return WM_ABORT_TO_STARSTAR;
+ t_ch = *++text;
+ }
+ return WM_ABORT_ALL;
+ case '[':
+ p_ch = *++p;
+ if (p_ch == '^')
+ p_ch = '!';
+ /* Assign literal 1/0 because of "matched" comparison. */
+ negated = p_ch == '!' ? 1 : 0;
+ if (negated) {
+ /* Inverted character class. */
+ p_ch = *++p;
+ }
+ prev_ch = 0;
+ matched = 0;
+ do {
+ if (!p_ch)
+ return WM_ABORT_ALL;
+ if (p_ch == '\\') {
+ p_ch = *++p;
+ if (!p_ch)
+ return WM_ABORT_ALL;
+ if (t_ch == p_ch)
+ matched = 1;
+ } else if (p_ch == '-' && prev_ch && p[1] && p[1] != ']') {
+ p_ch = *++p;
+ if (p_ch == '\\') {
+ p_ch = *++p;
+ if (!p_ch)
+ return WM_ABORT_ALL;
+ }
+ if (t_ch <= p_ch && t_ch >= prev_ch)
+ matched = 1;
+ else if ((flags & WM_CASEFOLD) && ISLOWER(t_ch)) {
+ uchar t_ch_upper = toupper(t_ch);
+ if (t_ch_upper <= p_ch && t_ch_upper >= prev_ch)
+ matched = 1;
+ }
+ p_ch = 0; /* This makes "prev_ch" get set to 0. */
+ } else if (p_ch == '[' && p[1] == ':') {
+ const uchar *s;
+ int i;
+ for (s = p += 2; (p_ch = *p) && p_ch != ']'; p++) {} /*SHARED ITERATOR*/
+ if (!p_ch)
+ return WM_ABORT_ALL;
+ i = p - s - 1;
+ if (i < 0 || p[-1] != ':') {
+ /* Didn't find ":]", so treat like a normal set. */
+ p = s - 2;
+ p_ch = '[';
+ if (t_ch == p_ch)
+ matched = 1;
+ continue;
+ }
+ if (CC_EQ(s,i, "alnum")) {
+ if (ISALNUM(t_ch))
+ matched = 1;
+ } else if (CC_EQ(s,i, "alpha")) {
+ if (ISALPHA(t_ch))
+ matched = 1;
+ } else if (CC_EQ(s,i, "blank")) {
+ if (ISBLANK(t_ch))
+ matched = 1;
+ } else if (CC_EQ(s,i, "cntrl")) {
+ if (ISCNTRL(t_ch))
+ matched = 1;
+ } else if (CC_EQ(s,i, "digit")) {
+ if (ISDIGIT(t_ch))
+ matched = 1;
+ } else if (CC_EQ(s,i, "graph")) {
+ if (ISGRAPH(t_ch))
+ matched = 1;
+ } else if (CC_EQ(s,i, "lower")) {
+ if (ISLOWER(t_ch))
+ matched = 1;
+ } else if (CC_EQ(s,i, "print")) {
+ if (ISPRINT(t_ch))
+ matched = 1;
+ } else if (CC_EQ(s,i, "punct")) {
+ if (ISPUNCT(t_ch))
+ matched = 1;
+ } else if (CC_EQ(s,i, "space")) {
+ if (ISSPACE(t_ch))
+ matched = 1;
+ } else if (CC_EQ(s,i, "upper")) {
+ if (ISUPPER(t_ch))
+ matched = 1;
+ else if ((flags & WM_CASEFOLD) && ISLOWER(t_ch))
+ matched = 1;
+ } else if (CC_EQ(s,i, "xdigit")) {
+ if (ISXDIGIT(t_ch))
+ matched = 1;
+ } else /* malformed [:class:] string */
+ return WM_ABORT_ALL;
+ p_ch = 0; /* This makes "prev_ch" get set to 0. */
+ } else if (t_ch == p_ch)
+ matched = 1;
+ } while (prev_ch = p_ch, (p_ch = *++p) != ']');
+ if (matched == negated ||
+ ((flags & WM_PATHNAME) && t_ch == '/'))
+ return WM_NOMATCH;
+ continue;
+ }
+ }
+
+ return *text ? WM_NOMATCH : WM_MATCH;
+}
+
+/* Match the "pattern" against the "text" string. */
+static int wildmatch(const char *pattern, const char *text, unsigned int flags)
+{
+ // local modification: move WM_CASEFOLD here
+ if (ignore_case)
+ flags |= WM_CASEFOLD;
+
+ return dowild((const uchar*)pattern, (const uchar*)text, flags);
+}
+
+// Copied from dir.h
+
+#define PATTERN_FLAG_NODIR 1
+#define PATTERN_FLAG_ENDSWITH 4
+#define PATTERN_FLAG_MUSTBEDIR 8
+#define PATTERN_FLAG_NEGATIVE 16
+
+// Copied from dir.c
+
+static int fspathncmp(const char *a, const char *b, size_t count)
+{
+ return ignore_case ? strncasecmp(a, b, count) : strncmp(a, b, count);
+}
+
+static int simple_length(const char *match)
+{
+ int len = -1;
+
+ for (;;) {
+ unsigned char c = *match++;
+ len++;
+ if (c == '\0' || is_glob_special(c))
+ return len;
+ }
+}
+
+static int no_wildcard(const char *string)
+{
+ return string[simple_length(string)] == '\0';
+}
+
+static void parse_path_pattern(const char **pattern,
+ int *patternlen,
+ unsigned *flags,
+ int *nowildcardlen)
+{
+ const char *p = *pattern;
+ size_t i, len;
+
+ *flags = 0;
+ if (*p == '!') {
+ *flags |= PATTERN_FLAG_NEGATIVE;
+ p++;
+ }
+ len = strlen(p);
+ if (len && p[len - 1] == '/') {
+ len--;
+ *flags |= PATTERN_FLAG_MUSTBEDIR;
+ }
+ for (i = 0; i < len; i++) {
+ if (p[i] == '/')
+ break;
+ }
+ if (i == len)
+ *flags |= PATTERN_FLAG_NODIR;
+ *nowildcardlen = simple_length(p);
+ /*
+ * we should have excluded the trailing slash from 'p' too,
+ * but that's one more allocation. Instead just make sure
+ * nowildcardlen does not exceed real patternlen
+ */
+ if (*nowildcardlen > len)
+ *nowildcardlen = len;
+ if (*p == '*' && no_wildcard(p + 1))
+ *flags |= PATTERN_FLAG_ENDSWITH;
+ *pattern = p;
+ *patternlen = len;
+}
+
+static void trim_trailing_spaces(char *buf)
+{
+ char *p, *last_space = NULL;
+
+ for (p = buf; *p; p++)
+ switch (*p) {
+ case ' ':
+ if (!last_space)
+ last_space = p;
+ break;
+ case '\\':
+ p++;
+ if (!*p)
+ return;
+ /* fallthrough */
+ default:
+ last_space = NULL;
+ }
+
+ if (last_space)
+ *last_space = '\0';
+}
+
+static int match_basename(const char *basename, int basenamelen,
+ const char *pattern, int prefix, int patternlen,
+ unsigned flags)
+{
+ if (prefix == patternlen) {
+ if (patternlen == basenamelen &&
+ !fspathncmp(pattern, basename, basenamelen))
+ return 1;
+ } else if (flags & PATTERN_FLAG_ENDSWITH) {
+ /* "*literal" matching against "fooliteral" */
+ if (patternlen - 1 <= basenamelen &&
+ !fspathncmp(pattern + 1,
+ basename + basenamelen - (patternlen - 1),
+ patternlen - 1))
+ return 1;
+ } else {
+ // local modification: call wildmatch() directly
+ if (!wildmatch(pattern, basename, flags))
+ return 1;
+ }
+ return 0;
+}
+
+static int match_pathname(const char *pathname, int pathlen,
+ const char *base, int baselen,
+ const char *pattern, int prefix, int patternlen)
+{
+ // local modification: remove local variables
+
+ /*
+ * match with FNM_PATHNAME; the pattern has base implicitly
+ * in front of it.
+ */
+ if (*pattern == '/') {
+ pattern++;
+ patternlen--;
+ prefix--;
+ }
+
+ /*
+ * baselen does not count the trailing slash. base[] may or
+ * may not end with a trailing slash though.
+ */
+ if (pathlen < baselen + 1 ||
+ (baselen && pathname[baselen] != '/') ||
+ fspathncmp(pathname, base, baselen))
+ return 0;
+
+ // local modification: simplified because always baselen > 0
+ pathname += baselen + 1;
+ pathlen -= baselen + 1;
+
+ if (prefix) {
+ /*
+ * if the non-wildcard part is longer than the
+ * remaining pathname, surely it cannot match.
+ */
+ if (prefix > pathlen)
+ return 0;
+
+ if (fspathncmp(pattern, pathname, prefix))
+ return 0;
+ pattern += prefix;
+ patternlen -= prefix;
+ pathname += prefix;
+ pathlen -= prefix;
+
+ /*
+ * If the whole pattern did not have a wildcard,
+ * then our prefix match is all we need; we
+ * do not need to call fnmatch at all.
+ */
+ if (!patternlen && !pathlen)
+ return 1;
+ }
+
+ // local modification: call wildmatch() directly
+ return !wildmatch(pattern, pathname, WM_PATHNAME);
+}
+
+// Copied from git/utf8.c
+
+static const char utf8_bom[] = "\357\273\277";
+
+//----------------------------(IMPORT FROM GIT END)----------------------------
+
+struct pattern {
+ unsigned int flags;
+ int nowildcardlen;
+ int patternlen;
+ int dirlen;
+ char pattern[];
+};
+
+static struct pattern **pattern_list;
+static int nr_patterns, alloced_patterns;
+
+// Remember the number of patterns at each directory level
+static int *nr_patterns_at;
+// Track the current/max directory level;
+static int depth, max_depth;
+static bool debug_on;
+static FILE *out_fp, *stat_fp;
+static char *prefix = "";
+static char *progname;
+
+static void __attribute__((noreturn)) perror_exit(const char *s)
+{
+ perror(s);
+
+ exit(EXIT_FAILURE);
+}
+
+static void __attribute__((noreturn)) error_exit(const char *fmt, ...)
+{
+ va_list args;
+
+ fprintf(stderr, "%s: error: ", progname);
+
+ va_start(args, fmt);
+ vfprintf(stderr, fmt, args);
+ va_end(args);
+
+ exit(EXIT_FAILURE);
+}
+
+static void debug(const char *fmt, ...)
+{
+ va_list args;
+ int i;
+
+ if (!debug_on)
+ return;
+
+ fprintf(stderr, "[DEBUG] ");
+
+ for (i = 0; i < depth * 2; i++)
+ fputc(' ', stderr);
+
+ va_start(args, fmt);
+ vfprintf(stderr, fmt, args);
+ va_end(args);
+}
+
+static void *xrealloc(void *ptr, size_t size)
+{
+ ptr = realloc(ptr, size);
+ if (!ptr)
+ perror_exit(progname);
+
+ return ptr;
+}
+
+static void *xmalloc(size_t size)
+{
+ return xrealloc(NULL, size);
+}
+
+// similar to last_matching_pattern_from_list() in GIT
+static bool is_ignored(const char *path, int pathlen, int dirlen, bool is_dir)
+{
+ int i;
+
+ // Search in the reverse order because the last matching pattern wins.
+ for (i = nr_patterns - 1; i >= 0; i--) {
+ struct pattern *p = pattern_list[i];
+ unsigned int flags = p->flags;
+ const char *gitignore_dir = p->pattern + p->patternlen + 1;
+ bool ignored;
+
+ if ((flags & PATTERN_FLAG_MUSTBEDIR) && !is_dir)
+ continue;
+
+ if (flags & PATTERN_FLAG_NODIR) {
+ if (!match_basename(path + dirlen + 1,
+ pathlen - dirlen - 1,
+ p->pattern,
+ p->nowildcardlen,
+ p->patternlen,
+ p->flags))
+ continue;
+ } else {
+ if (!match_pathname(path, pathlen,
+ gitignore_dir, p->dirlen,
+ p->pattern,
+ p->nowildcardlen,
+ p->patternlen))
+ continue;
+ }
+
+ debug("%s: matches %s%s%s (%s/.gitignore)\n", path,
+ flags & PATTERN_FLAG_NEGATIVE ? "!" : "", p->pattern,
+ flags & PATTERN_FLAG_MUSTBEDIR ? "/" : "",
+ gitignore_dir);
+
+ ignored = (flags & PATTERN_FLAG_NEGATIVE) == 0;
+ if (ignored)
+ debug("Ignore: %s\n", path);
+
+ return ignored;
+ }
+
+ debug("%s: no match\n", path);
+
+ return false;
+}
+
+static void add_pattern(const char *string, const char *dir, int dirlen)
+{
+ struct pattern *p;
+ int patternlen, nowildcardlen;
+ unsigned int flags;
+
+ parse_path_pattern(&string, &patternlen, &flags, &nowildcardlen);
+
+ if (patternlen == 0)
+ return;
+
+ p = xmalloc(sizeof(*p) + patternlen + dirlen + 2);
+
+ memcpy(p->pattern, string, patternlen);
+ p->pattern[patternlen] = 0;
+ memcpy(p->pattern + patternlen + 1, dir, dirlen);
+ p->pattern[patternlen + 1 + dirlen] = 0;
+
+ p->patternlen = patternlen;
+ p->nowildcardlen = nowildcardlen;
+ p->dirlen = dirlen;
+ p->flags = flags;
+
+ debug("Add pattern: %s%s%s\n",
+ flags & PATTERN_FLAG_NEGATIVE ? "!" : "", p->pattern,
+ flags & PATTERN_FLAG_MUSTBEDIR ? "/" : "");
+
+ if (nr_patterns >= alloced_patterns) {
+ alloced_patterns += 128;
+ pattern_list = xrealloc(pattern_list,
+ sizeof(*pattern_list) * alloced_patterns);
+ }
+
+ pattern_list[nr_patterns++] = p;
+}
+
+// similar to add_patterns_from_buffer() in GIT
+static void add_patterns_from_gitignore(const char *dir, int dirlen)
+{
+ struct stat st;
+ char path[PATH_MAX], *buf, *entry;
+ size_t size;
+ int fd, pathlen, i;
+
+ pathlen = snprintf(path, sizeof(path), "%s/.gitignore", dir);
+ if (pathlen >= sizeof(path))
+ error_exit("%s: too long path was truncated\n", path);
+
+ fd = open(path, O_RDONLY | O_NOFOLLOW);
+ if (fd < 0) {
+ if (errno != ENOENT)
+ return perror_exit(path);
+ return;
+ }
+
+ if (fstat(fd, &st) < 0)
+ perror_exit(path);
+
+ size = st.st_size;
+
+ buf = xmalloc(size + 1);
+ if (read(fd, buf, st.st_size) != st.st_size)
+ perror_exit(path);
+
+ buf[st.st_size] = '\n';
+ if (close(fd))
+ perror_exit(path);
+
+ debug("Parse %s\n", path);
+
+ entry = buf;
+
+ // skip utf8 bom
+ if (!strncmp(entry, utf8_bom, strlen(utf8_bom)))
+ entry += strlen(utf8_bom);
+
+ for (i = entry - buf; i < size; i++) {
+ if (buf[i] == '\n') {
+ if (entry != buf + i && entry[0] != '#') {
+ buf[i - (i && buf[i-1] == '\r')] = 0;
+ trim_trailing_spaces(entry);
+ add_pattern(entry, dir, dirlen);
+ }
+ entry = buf + i + 1;
+ }
+ }
+
+ free(buf);
+}
+
+// Save the current number of patterns and increment the depth
+static void increment_depth(void)
+{
+ if (depth >= max_depth) {
+ max_depth += 1;
+ nr_patterns_at = xrealloc(nr_patterns_at,
+ sizeof(*nr_patterns_at) * max_depth);
+ }
+
+ nr_patterns_at[depth] = nr_patterns;
+ depth++;
+}
+
+// Decrement the depth, and free up the patterns of this directory level.
+static void decrement_depth(void)
+{
+ depth--;
+ assert(depth >= 0);
+
+ while (nr_patterns > nr_patterns_at[depth])
+ free(pattern_list[--nr_patterns]);
+}
+
+static void print_path(const char *path)
+{
+ // The path always starts with "./"
+ assert(strlen(path) >= 2);
+
+ // Replace the root directory with a preferred prefix.
+ // This is useful for the tar command.
+ fprintf(out_fp, "%s%s\n", prefix, path + 2);
+}
+
+static void print_stat(const char *path, struct stat *st)
+{
+ if (!stat_fp)
+ return;
+
+ if (!S_ISREG(st->st_mode) && !S_ISLNK(st->st_mode))
+ return;
+
+ assert(strlen(path) >= 2);
+
+ fprintf(stat_fp, "%c %9ld %10ld %s\n",
+ S_ISLNK(st->st_mode) ? 'l' : '-',
+ st->st_size, st->st_mtim.tv_sec, path + 2);
+}
+
+// Traverse the entire directory tree, parsing .gitignore files.
+// Print file paths that are not tracked by git.
+//
+// Return true if all files under the directory are ignored, false otherwise.
+static bool traverse_directory(const char *dir, int dirlen)
+{
+ bool all_ignored = true;
+ DIR *dirp;
+
+ debug("Enter[%d]: %s\n", depth, dir);
+ increment_depth();
+
+ add_patterns_from_gitignore(dir, dirlen);
+
+ dirp = opendir(dir);
+ if (!dirp)
+ perror_exit(dir);
+
+ while (1) {
+ struct dirent *d;
+ struct stat st;
+ char path[PATH_MAX];
+ int pathlen;
+ bool ignored;
+
+ errno = 0;
+ d = readdir(dirp);
+ if (!d) {
+ if (errno)
+ perror_exit(dir);
+ break;
+ }
+
+ if (!strcmp(d->d_name, "..") || !strcmp(d->d_name, "."))
+ continue;
+
+ pathlen = snprintf(path, sizeof(path), "%s/%s", dir, d->d_name);
+ if (pathlen >= sizeof(path))
+ error_exit("%s: too long path was truncated\n", path);
+
+ if (lstat(path, &st) < 0)
+ perror_exit(path);
+
+ if ((!S_ISREG(st.st_mode) && !S_ISDIR(st.st_mode) && !S_ISLNK(st.st_mode)) ||
+ is_ignored(path, pathlen, dirlen, S_ISDIR(st.st_mode))) {
+ ignored = true;
+ } else {
+ if (S_ISDIR(st.st_mode) && !S_ISLNK(st.st_mode))
+ // If all the files in a directory are ignored,
+ // let's ignore that directory as well. This
+ // will avoid empty directories in the tarball.
+ ignored = traverse_directory(path, pathlen);
+ else
+ ignored = false;
+ }
+
+ if (ignored) {
+ print_path(path);
+ } else {
+ print_stat(path, &st);
+ all_ignored = false;
+ }
+ }
+
+ if (closedir(dirp))
+ perror_exit(dir);
+
+ decrement_depth();
+ debug("Leave[%d]: %s\n", depth, dir);
+
+ return all_ignored;
+}
+
+static void usage(void)
+{
+ fprintf(stderr,
+ "usage: %s [options]\n"
+ "\n"
+ "Show files that are ignored by git\n"
+ "\n"
+ "options:\n"
+ " -d, --debug print debug messages to stderr\n"
+ " -e, --exclude PATTERN add the given exclude pattern\n"
+ " -h, --help show this help message and exit\n"
+ " -i, --ignore-case Ignore case differences between the patterns and the files\n"
+ " -o, --output FILE output the ignored files to a file (default: '-', i.e. stdout)\n"
+ " -p, --prefix PREFIX prefix added to each path (default: empty string)\n"
+ " -r, --rootdir DIR root of the source tree (default: current working directory)\n"
+ " -s, --stat FILE output the file stat of non-ignored files to a file\n",
+ progname);
+}
+
+static void open_output(const char *pathname, FILE **fp)
+{
+ if (strcmp(pathname, "-")) {
+ *fp = fopen(pathname, "w");
+ if (!*fp)
+ perror_exit(pathname);
+ } else {
+ *fp = stdout;
+ }
+}
+
+static void close_output(const char *pathname, FILE *fp)
+{
+ fflush(fp);
+
+ if (ferror(fp))
+ error_exit("not all data was written to the output\n");
+
+ if (fclose(fp))
+ perror_exit(pathname);
+}
+
+int main(int argc, char *argv[])
+{
+ const char *output = "-";
+ const char *rootdir = ".";
+ const char *stat = NULL;
+
+ progname = strrchr(argv[0], '/');
+ if (progname)
+ progname++;
+ else
+ progname = argv[0];
+
+ while (1) {
+ static struct option long_options[] = {
+ {"debug", no_argument, NULL, 'd'},
+ {"help", no_argument, NULL, 'h'},
+ {"ignore-case", no_argument, NULL, 'i'},
+ {"output", required_argument, NULL, 'o'},
+ {"prefix", required_argument, NULL, 'p'},
+ {"rootdir", required_argument, NULL, 'r'},
+ {"stat", required_argument, NULL, 's'},
+ {"exclude", required_argument, NULL, 'x'},
+ {},
+ };
+
+ int c = getopt_long(argc, argv, "dhino:p:r:s:x:", long_options, NULL);
+
+ if (c == -1)
+ break;
+
+ switch (c) {
+ case 'd':
+ debug_on = true;
+ break;
+ case 'h':
+ usage();
+ exit(0);
+ case 'i':
+ ignore_case = true;
+ break;
+ case 'o':
+ output = optarg;
+ break;
+ case 'p':
+ prefix = optarg;
+ break;
+ case 'r':
+ rootdir = optarg;
+ break;
+ case 's':
+ stat = optarg;
+ break;
+ case 'x':
+ add_pattern(optarg, ".", strlen("."));
+ break;
+ case '?':
+ usage();
+ /* fallthrough */
+ default:
+ exit(EXIT_FAILURE);
+ }
+ }
+
+ open_output(output, &out_fp);
+ if (stat && stat[0])
+ open_output(stat, &stat_fp);
+
+ if (chdir(rootdir))
+ perror_exit(rootdir);
+
+ add_pattern(".git/", ".", strlen("."));
+
+ if (traverse_directory(".", strlen(".")))
+ print_path("./");
+
+ assert(depth == 0);
+
+ while (nr_patterns > 0)
+ free(pattern_list[--nr_patterns]);
+ free(pattern_list);
+ free(nr_patterns_at);
+
+ close_output(output, out_fp);
+ if (stat_fp)
+ close_output(stat, stat_fp);
+
+ return 0;
+}
diff --git a/scripts/misc-check b/scripts/misc-check
new file mode 100755
index 0000000000000000000000000000000000000000..d40d5484e0c50da1414c5628c9b4b58d68451bd0
--- /dev/null
+++ b/scripts/misc-check
@@ -0,0 +1,19 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0-only
+
+set -e
+
+# Detect files that are tracked but ignored by git. This is checked only when
+# ${KBUILD_EXTRA_WARN} contains 1, git is installed, and the source tree is
+# tracked by git.
+check_tracked_ignored_files () {
+ case "${KBUILD_EXTRA_WARN}" in
+ *1*) ;;
+ *) return;;
+ esac
+
+ git -C ${srctree:-.} ls-files -i -c --exclude-per-directory=.gitignore 2>/dev/null |
+ sed 's/$/: warning: ignored by one of the .gitignore files/' >&2
+}
+
+check_tracked_ignored_files
diff --git a/scripts/package/builddeb b/scripts/package/builddeb
index 67cd420dcf8900a33245ef33711d782c9d0098a1..ff5e7d8e380bba654657bf43dc544a571fd90e28 100755
--- a/scripts/package/builddeb
+++ b/scripts/package/builddeb
@@ -42,11 +42,9 @@ create_package() {
else
chown -R root:root "$pdir"
fi
- chmod -R go-w "$pdir"
- # in case we are in a restrictive umask environment like 0077
- chmod -R a+rX "$pdir"
- # in case we build in a setuid/setgid directory
- chmod -R ug-s "$pdir"
+ # a+rX in case we are in a restrictive umask environment like 0077
+ # ug-s in case we build in a setuid/setgid directory
+ chmod -R go-w,a+rX,ug-s "$pdir"
# Create the package
dpkg-gencontrol -p$pname -P"$pdir"
diff --git a/scripts/package/buildtar b/scripts/package/buildtar
index 4d6f0b128efd97109349199f1ae7b24d883f9a8b..65b4ea50296219e2cfed406dddd3cb4eac0737ea 100755
--- a/scripts/package/buildtar
+++ b/scripts/package/buildtar
@@ -16,39 +16,7 @@ set -e
#
# Some variables and settings used throughout the script
#
-tmpdir="${objtree}/tar-install"
-tarball="${objtree}/linux-${KERNELRELEASE}-${ARCH}.tar"
-
-
-#
-# Figure out how to compress, if requested at all
-#
-case "${1}" in
- dir-pkg|tar-pkg)
- opts=
- ;;
- targz-pkg)
- opts="-I ${KGZIP}"
- tarball=${tarball}.gz
- ;;
- tarbz2-pkg)
- opts="-I ${KBZIP2}"
- tarball=${tarball}.bz2
- ;;
- tarxz-pkg)
- opts="-I ${XZ}"
- tarball=${tarball}.xz
- ;;
- tarzst-pkg)
- opts="-I ${ZSTD}"
- tarball=${tarball}.zst
- ;;
- *)
- echo "Unknown tarball target \"${1}\" requested, please add it to ${0}." >&2
- exit 1
- ;;
-esac
-
+tmpdir=$1
#
# Clean-up and re-create the temporary directory
@@ -148,21 +116,3 @@ case "${ARCH}" in
sleep 5
;;
esac
-
-if [ "${1}" = dir-pkg ]; then
- echo "Kernel tree successfully created in $tmpdir"
- exit 0
-fi
-
-#
-# Create the tarball
-#
-if tar --owner=root --group=root --help >/dev/null 2>&1; then
- opts="$opts --owner=root --group=root"
-fi
-
-tar cf $tarball -C $tmpdir $opts $dirs
-
-echo "Tarball successfully created in $tarball"
-
-exit 0
diff --git a/scripts/package/deb-build-option b/scripts/package/deb-build-option
new file mode 100755
index 0000000000000000000000000000000000000000..b079b0d121d47359d447a83d87822072d619da28
--- /dev/null
+++ b/scripts/package/deb-build-option
@@ -0,0 +1,16 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0-only
+
+# Set up CROSS_COMPILE if we are cross-compiling, but not called from the
+# kernel toplevel Makefile
+if [ -z "${CROSS_COMPILE}${cross_compiling}" -a "${DEB_HOST_ARCH}" != "${DEB_BUILD_ARCH}" ]; then
+ echo CROSS_COMPILE=${DEB_HOST_GNU_TYPE}-
+fi
+
+version=$(dpkg-parsechangelog -S Version)
+version_upstream="${version%-*}"
+debian_revision="${version#${version_upstream}}"
+debian_revision="${debian_revision#*-}"
+
+echo KERNELRELEASE=${version_upstream}
+echo KBUILD_BUILD_VERSION=${debian_revision}
diff --git a/scripts/package/mkdebian b/scripts/package/mkdebian
index 6cf383225b8b50adbab4d970e1a82c8b0bfed1af..f74380036bb54e0b107e49da9bdaca8c0b89cb04 100755
--- a/scripts/package/mkdebian
+++ b/scripts/package/mkdebian
@@ -84,16 +84,16 @@ set_debarch() {
fi
}
+rm -rf debian
+
# Some variables and settings used throughout the script
version=$KERNELRELEASE
if [ -n "$KDEB_PKGVERSION" ]; then
packageversion=$KDEB_PKGVERSION
- revision=${packageversion##*-}
else
- revision=$($srctree/init/build-version)
- packageversion=$version-$revision
+ packageversion=$version-$($srctree/init/build-version)
fi
-sourcename=$KDEB_SOURCENAME
+sourcename=${KDEB_SOURCENAME:-linux-upstream}
if [ "$ARCH" = "um" ] ; then
packagename=user-mode-linux
@@ -133,7 +133,24 @@ else
fi
mkdir -p debian/source/
-echo "1.0" > debian/source/format
+echo "3.0 (quilt)" > debian/source/format
+
+{
+ echo "diff-ignore"
+ echo "extend-diff-ignore = .*"
+} > debian/source/local-options
+
+# Add .config as a patch
+mkdir -p debian/patches
+{
+ echo "Subject: Add .config"
+ echo "Author: ${maintainer}"
+ echo
+ echo "--- /dev/null"
+ echo "+++ linux/.config"
+ diff -u /dev/null "${KCONFIG_CONFIG}" | tail -n +3
+} > debian/patches/config
+echo config > debian/patches/series
echo $debarch > debian/arch
extra_build_depends=", $(if_enabled_echo CONFIG_UNWINDER_ORC libelf-dev:native)"
@@ -225,19 +242,18 @@ srctree ?= .
build-indep:
build-arch:
- \$(MAKE) KERNELRELEASE=${version} ARCH=${ARCH} \
- KBUILD_BUILD_VERSION=${revision} -f \$(srctree)/Makefile
+ \$(MAKE) -f \$(srctree)/Makefile ARCH=${ARCH} \
+ \$(shell \$(srctree)/scripts/package/deb-build-option) \
+ olddefconfig all
build: build-arch
binary-indep:
binary-arch: build-arch
- \$(MAKE) KERNELRELEASE=${version} ARCH=${ARCH} \
- KBUILD_BUILD_VERSION=${revision} -f \$(srctree)/Makefile intdeb-pkg
-
+ \$(MAKE) -f \$(srctree)/Makefile ARCH=${ARCH} intdeb-pkg
clean:
- rm -rf debian/*tmp debian/files
- \$(MAKE) clean
+ rm -rf debian/files debian/linux-*
+ \$(MAKE) -f \$(srctree)/Makefile ARCH=${ARCH} clean
binary: binary-arch
EOF
diff --git a/scripts/package/mkspec b/scripts/package/mkspec
index 094e52c979a8cdbea1af95da6fcba93104e82ff4..3c550960dd39554a0cf60f0e6e3fd123a0eafd46 100755
--- a/scripts/package/mkspec
+++ b/scripts/package/mkspec
@@ -33,8 +33,6 @@ EXCLUDES="$RCS_TAR_IGNORE --exclude=*vmlinux* --exclude=*.mod \
--exclude=*.o --exclude=*.ko --exclude=*.cmd --exclude=Documentation \
--exclude=.config.old --exclude=.missing-syscalls.d --exclude=*.s"
-test -n "$LOCALVERSION" && MAKE="$MAKE LOCALVERSION=$LOCALVERSION"
-
# We can label the here-doc lines for conditional output to the spec file
#
# Labels:
@@ -49,7 +47,8 @@ sed -e '/^DEL/d' -e 's/^\t*//' <<EOF
Group: System Environment/Kernel
Vendor: The Linux Community
URL: https://www.kernel.org
-$S Source: kernel-$__KERNELRELEASE.tar.gz
+$S Source0: linux.tar.gz
+$S Source1: .config
Provides: $PROVIDES
$S BuildRequires: bc binutils bison dwarves
$S BuildRequires: (elfutils-libelf-devel or libelf-devel) flex
@@ -85,12 +84,11 @@ $S$M This package provides kernel headers and makefiles sufficient to build modu
$S$M against the $__KERNELRELEASE kernel package.
$S$M
$S %prep
-$S %setup -q
-$S rm -f scripts/basic/fixdep scripts/kconfig/conf
-$S rm -f tools/objtool/{fixdep,objtool}
+$S %setup -q -n linux
+$S cp %{SOURCE1} .
$S
$S %build
-$S $MAKE %{?_smp_mflags} KBUILD_BUILD_VERSION=%{release}
+$S $MAKE %{?_smp_mflags} KERNELRELEASE=$KERNELRELEASE KBUILD_BUILD_VERSION=%{release}
$S
%install
mkdir -p %{buildroot}/boot
diff --git a/scripts/remove-stale-files b/scripts/remove-stale-files
index 64b14aa5aebf4462a40f4112fd34ca7cef05282f..7f432900671a7a1f5322681fab70141a47a9062e 100755
--- a/scripts/remove-stale-files
+++ b/scripts/remove-stale-files
@@ -21,31 +21,15 @@ set -e
# then will be really dead and removed from the code base entirely.
rm -f arch/powerpc/purgatory/kexec-purgatory.c
-
-# These were previously generated source files. When you are building the kernel
-# with O=, make sure to remove the stale files in the output tree. Otherwise,
-# the build system wrongly compiles the stale ones.
-if [ -n "${building_out_of_srctree}" ]; then
- for f in fdt_rw.c fdt_ro.c fdt_wip.c fdt.c ashldi3.S bswapsdi2.S font.c lib1funcs.S hyp-stub.S
- do
- rm -f arch/arm/boot/compressed/${f}
- done
-
- for f in uart-ath79.c ashldi3.c bswapdi.c bswapsi.c
- do
- rm -f arch/mips/boot/compressed/${f}
- done
-
- for f in firmware.c real2.S
- do
- rm -f arch/parisc/boot/compressed/${f}
- done
-fi
-
rm -f arch/riscv/purgatory/kexec-purgatory.c
+rm -f arch/x86/purgatory/kexec-purgatory.c
rm -f scripts/extract-cert
-rm -f arch/x86/purgatory/kexec-purgatory.c
-
rm -f scripts/kconfig/[gmnq]conf-cfg
+
+rm -f rust/target.json
+
+rm -f scripts/bin2c
+
+rm -f .scmversion
diff --git a/scripts/setlocalversion b/scripts/setlocalversion
index af4754a35e665230badde79e043c172eeef03325..e54839a42d4b49daf5cc3102e93adab36b59ff50 100755
--- a/scripts/setlocalversion
+++ b/scripts/setlocalversion
@@ -11,16 +11,11 @@
#
usage() {
- echo "Usage: $0 [--save-scmversion] [srctree]" >&2
+ echo "Usage: $0 [srctree]" >&2
exit 1
}
-scm_only=false
srctree=.
-if test "$1" = "--save-scmversion"; then
- scm_only=true
- shift
-fi
if test $# -gt 0; then
srctree=$1
shift
@@ -32,57 +27,69 @@ fi
scm_version()
{
local short
+ local tag
short=false
cd "$srctree"
- if test -e .scmversion; then
- cat .scmversion
- return
- fi
if test "$1" = "--short"; then
short=true
fi
- # Check for git and a git repo.
- if test -z "$(git rev-parse --show-cdup 2>/dev/null)" &&
- head=$(git rev-parse --verify HEAD 2>/dev/null); then
-
- # If we are at a tagged commit (like "v2.6.30-rc6"), we ignore
- # it, because this version is defined in the top level Makefile.
- if [ -z "$(git describe --exact-match 2>/dev/null)" ]; then
-
- # If only the short version is requested, don't bother
- # running further git commands
- if $short; then
- echo "+"
- return
- fi
- # If we are past a tagged commit (like
- # "v2.6.30-rc5-302-g72357d5"), we pretty print it.
- if atag="$(git describe 2>/dev/null)"; then
- echo "$atag" | awk -F- '{printf("-%05d", $(NF-1))}'
- fi
-
- # Add -g and exactly 12 hex chars.
- printf '%s%s' -g "$(echo $head | cut -c1-12)"
- fi
+ if test -n "$(git rev-parse --show-cdup 2>/dev/null)"; then
+ return
+ fi
+
+ if ! head=$(git rev-parse --verify HEAD 2>/dev/null); then
+ return
+ fi
+
+ # If a localversion*' file and the corresponding annotated tag exist,
+ # use it. This is the case in linux-next.
+ tag=${file_localversion#-}
+ tag=$(git describe --exact-match --match=$tag $tag 2>/dev/null)
+
+ # Otherwise, default to the annotated tag derived from KERNELVERSION.
+ # mainline kernel: 6.2.0-rc5 -> v6.2-rc5
+ # stable kernel: 6.1.7 -> v6.1.7
+ if [ -z "${tag}" ]; then
+ tag=v$(echo "${KERNELVERSION}" | sed -E 's/^([0-9]+\.[0-9]+)\.0(.*)$/\1\2/')
+ fi
+
+ # If we are at the tagged commit, we ignore it because the version is
+ # well-defined.
+ if [ -z "$(git describe --exact-match --match=$tag 2>/dev/null)" ]; then
- # Check for uncommitted changes.
- # This script must avoid any write attempt to the source tree,
- # which might be read-only.
- # You cannot use 'git describe --dirty' because it tries to
- # create .git/index.lock .
- # First, with git-status, but --no-optional-locks is only
- # supported in git >= 2.14, so fall back to git-diff-index if
- # it fails. Note that git-diff-index does not refresh the
- # index, so it may give misleading results. See
- # git-update-index(1), git-diff-index(1), and git-status(1).
- if {
- git --no-optional-locks status -uno --porcelain 2>/dev/null ||
- git diff-index --name-only HEAD
- } | read dummy; then
- printf '%s' -dirty
+ # If only the short version is requested, don't bother
+ # running further git commands
+ if $short; then
+ echo "+"
+ return
+ fi
+ # If we are past the tagged commit, we pretty print it.
+ # (like 6.1.0-14595-g292a089d78d3)
+ if atag="$(git describe --match=$tag 2>/dev/null)"; then
+ echo "$atag" | awk -F- '{printf("-%05d", $(NF-1))}'
fi
+
+ # Add -g and exactly 12 hex chars.
+ printf '%s%s' -g "$(echo $head | cut -c1-12)"
+ fi
+
+ # Check for uncommitted changes.
+ # This script must avoid any write attempt to the source tree, which
+ # might be read-only.
+ # You cannot use 'git describe --dirty' because it tries to create
+ # .git/index.lock .
+ # First, with git-status, but --no-optional-locks is only supported in
+ # git >= 2.14, so fall back to git-diff-index if it fails. Note that
+ # git-diff-index does not refresh the index, so it may give misleading
+ # results.
+ # See git-update-index(1), git-diff-index(1), and git-status(1).
+ if {
+ git --no-optional-locks status -uno --porcelain 2>/dev/null ||
+ git diff-index --name-only HEAD
+ } | read dummy; then
+ printf '%s' -dirty
fi
}
@@ -103,33 +110,29 @@ collect_files()
echo "$res"
}
-if $scm_only; then
- if test ! -e .scmversion; then
- res=$(scm_version)
- echo "$res" >.scmversion
- fi
- exit
-fi
-
if ! test -e include/config/auto.conf; then
echo "Error: kernelrelease not valid - run 'make prepare' to update it" >&2
exit 1
fi
+if [ -z "${KERNELVERSION}" ]; then
+ echo "KERNELVERSION is not set" >&2
+ exit 1
+fi
+
# localversion* files in the build and source directory
-res="$(collect_files localversion*)"
+file_localversion="$(collect_files localversion*)"
if test ! "$srctree" -ef .; then
- res="$res$(collect_files "$srctree"/localversion*)"
+ file_localversion="${file_localversion}$(collect_files "$srctree"/localversion*)"
fi
-# CONFIG_LOCALVERSION and LOCALVERSION (if set)
+# version string from CONFIG_LOCALVERSION
config_localversion=$(sed -n 's/^CONFIG_LOCALVERSION=\(.*\)$/\1/p' include/config/auto.conf)
-res="${res}${config_localversion}${LOCALVERSION}"
-# scm version string if not at a tagged commit
+# scm version string if not at the kernel version tag or at the file_localversion
if grep -q "^CONFIG_LOCALVERSION_AUTO=y$" include/config/auto.conf; then
# full scm version string
- res="$res$(scm_version)"
+ scm_version="$(scm_version)"
elif [ "${LOCALVERSION+set}" != "set" ]; then
# If the variable LOCALVERSION is not set, append a plus
# sign if the repository is not in a clean annotated or
@@ -138,8 +141,7 @@ elif [ "${LOCALVERSION+set}" != "set" ]; then
#
# If the variable LOCALVERSION is set (including being set
# to an empty string), we don't want to append a plus sign.
- scm=$(scm_version --short)
- res="$res${scm:++}"
+ scm_version="$(scm_version --short)"
fi
-echo "$res"
+echo "${KERNELVERSION}${file_localversion}${config_localversion}${LOCALVERSION}${scm_version}"
diff --git a/scripts/tags.sh b/scripts/tags.sh
index faf214bcf2336b010ae609082102ee24b8fa7024..ea31640b267155eb3e46a0c2489c94fd688f1475 100755
--- a/scripts/tags.sh
+++ b/scripts/tags.sh
@@ -8,7 +8,7 @@
# Uses the following environment variables:
# SUBARCH, SRCARCH, srctree
-if [ "$KBUILD_VERBOSE" = "1" ]; then
+if [[ "$KBUILD_VERBOSE" =~ 1 ]]; then
set -x
fi