From cb6bf7f285c270d7808807128b5bce414e3f254a Mon Sep 17 00:00:00 2001
From: Pavel Begunkov <asml.silence@gmail.com>
Date: Mon, 23 Jan 2023 14:37:18 +0000
Subject: [PATCH] io_uring: refactor tctx_task_work
Merge almost identical sections of tctx_task_work(), this will make code
modifications later easier and also inlines handle_tw_list().
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/d06592d91e3e7559e7a4dbb8907d110863008dc7.1674484266.git.asml.silence@gmail.com
[axboe: fold in setting count to zero patch from Tom Rix]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
io_uring/io_uring.c | 13 +++++--------
1 file changed, 5 insertions(+), 8 deletions(-)
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 106cba919023f..55101013f3ee8 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -1166,7 +1166,7 @@ static unsigned int handle_tw_list(struct llist_node *node,
{
unsigned int count = 0;
- while (node != last) {
+ while (node && node != last) {
struct llist_node *next = node->next;
struct io_kiocb *req = container_of(node, struct io_kiocb,
io_task_work.node);
@@ -1226,23 +1226,20 @@ void tctx_task_work(struct callback_head *cb)
task_work);
struct llist_node fake = {};
struct llist_node *node;
- unsigned int loops = 1;
- unsigned int count;
+ unsigned int loops = 0;
+ unsigned int count = 0;
if (unlikely(current->flags & PF_EXITING)) {
io_fallback_tw(tctx);
return;
}
- node = io_llist_xchg(&tctx->task_list, &fake);
- count = handle_tw_list(node, &ctx, &uring_locked, NULL);
- node = io_llist_cmpxchg(&tctx->task_list, &fake, NULL);
- while (node != &fake) {
+ do {
loops++;
node = io_llist_xchg(&tctx->task_list, &fake);
count += handle_tw_list(node, &ctx, &uring_locked, &fake);
node = io_llist_cmpxchg(&tctx->task_list, &fake, NULL);
- }
+ } while (node != &fake);
ctx_flush_and_put(ctx, &uring_locked);
--
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