Patch "io_uring: don't save/restore iowait state" has been added to the 5.10-stable tree

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This is a note to let you know that I've just added the patch titled

    io_uring: don't save/restore iowait state

to the 5.10-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-save-restore-iowait-state.patch
and it can be found in the queue-5.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 77e27cb846941198b3fc06bc0706ad3c5fc21e34
Author: Jens Axboe <axboe@xxxxxxxxx>
Date:   Mon Mar 11 13:30:43 2024 -0600

    io_uring: don't save/restore iowait state
    
    [ Upstream commit 6f0974eccbf78baead1735722c4f1ee3eb9422cd ]
    
    This kind of state is per-syscall, and since we're doing the waiting off
    entering the io_uring_enter(2) syscall, there's no way that iowait can
    already be set for this case. Simplify it by setting it if we need to,
    and always clearing it to 0 when done.
    
    Fixes: 7b72d661f1f2 ("io_uring: gate iowait schedule on having pending requests")
    Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 67a355f27ad80..fc60396c90396 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -7640,7 +7640,7 @@ static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx,
 					  struct io_wait_queue *iowq,
 					  ktime_t *timeout)
 {
-	int io_wait, ret;
+	int ret;
 
 	/* make sure we run task_work before checking for signals */
 	ret = io_run_task_work_sig();
@@ -7655,13 +7655,12 @@ static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx,
 	 * can take into account that the task is waiting for IO - turns out
 	 * to be important for low QD IO.
 	 */
-	io_wait = current->in_iowait;
 	if (current_pending_io())
 		current->in_iowait = 1;
 	ret = 1;
 	if (!schedule_hrtimeout(timeout, HRTIMER_MODE_ABS))
 		ret = -ETIME;
-	current->in_iowait = io_wait;
+	current->in_iowait = 0;
 	return ret;
 }
 




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