[PATCH] io_uring: use cond_resched() in sqthread

[Jens Axboe <axboe@xxxxxxxxx>]

If preempt isn't enabled in the kernel, we can run into hang issues with
sqthread submissions. Use cond_resched() to play nice instead of
cpu_relax(), if we end up starting the loop and not having any events
pending for submissions.

Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>

---

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 854dedd885fa..05a299e80159 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2438,7 +2438,7 @@ static int io_sq_thread(void *data)
 			 * to sleep.
 			 */
 			if (inflight || !time_after(jiffies, timeout)) {
-				cpu_relax();
+				cond_resched();
 				continue;
 			}
 
-- 
Jens Axboe