From: Jens Axboe <axboe@kernel.dk>
Date: Thu, 3 Sep 2020 14:49:51 +0000 (-0600)
Subject: engines/io_uring: use the atomic load acquire instead of a barrier
X-Git-Tag: fio-3.23~2
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=2dd96cc46fa83a73acc1c9238c3ac59203e10213;p=fio.git

engines/io_uring: use the atomic load acquire instead of a barrier

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/engines/io_uring.c b/engines/io_uring.c
index 44b3c533..ca5b90c9 100644
--- a/engines/io_uring.c
+++ b/engines/io_uring.c
@@ -446,9 +446,10 @@ static int fio_ioring_commit(struct thread_data *td)
 	 */
 	if (o->sqpoll_thread) {
 		struct io_sq_ring *ring = &ld->sq_ring;
+		unsigned flags;
 
-		read_barrier();
-		if (*ring->flags & IORING_SQ_NEED_WAKEUP)
+		flags = atomic_load_acquire(ring->flags);
+		if (flags & IORING_SQ_NEED_WAKEUP)
 			io_uring_enter(ld, ld->queued, 0,
 					IORING_ENTER_SQ_WAKEUP);
 		ld->queued = 0;