This is a note to let you know that I've just added the patch titled
io_uring: don't use TIF_NOTIFY_SIGNAL to test for availability of task_work
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
io_uring-don-t-use-tif_notify_signal-to-test-for-ava.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 7eba1466830a087049cb964c7ecb86d98e1b31a2
Author: Jens Axboe <axboe@xxxxxxxxx>
Date: Sat Dec 17 13:40:17 2022 -0700
io_uring: don't use TIF_NOTIFY_SIGNAL to test for availability of task_work
[ Upstream commit 6434ec0186b80c734aa7a2acf95f75f5c6dd943b ]
Use task_work_pending() as a better test for whether we have task_work
or not, TIF_NOTIFY_SIGNAL is only valid if the any of the task_work
items had been queued with TWA_SIGNAL as the notification mechanism.
Hence task_work_pending() is a more reliable check.
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Stable-dep-of: 22537c9f7941 ("io_uring: use the right type for work_llist empty check")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/io_uring/io_uring.h b/io_uring/io_uring.h
index 59e6f755f12c6..9e74f7968e059 100644
--- a/io_uring/io_uring.h
+++ b/io_uring/io_uring.h
@@ -275,8 +275,7 @@ static inline int io_run_task_work(void)
static inline bool io_task_work_pending(struct io_ring_ctx *ctx)
{
- return test_thread_flag(TIF_NOTIFY_SIGNAL) ||
- !wq_list_empty(&ctx->work_llist);
+ return task_work_pending(current) || !wq_list_empty(&ctx->work_llist);
}
static inline int io_run_task_work_ctx(struct io_ring_ctx *ctx)
