From: Stefan Bühler <source@stbuehler.de>
Date: Wed, 24 Apr 2019 21:54:21 +0000 (+0200)
Subject: io_uring: remove unnecessary barrier after incrementing dropped counter
X-Git-Tag: v5.4-rc1~1153^2~8
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b841f19524a16cd93a39f9306191f85c549a2bc2;p=platform%2Fkernel%2Flinux-rpi.git

io_uring: remove unnecessary barrier after incrementing dropped counter

smp_store_release in io_commit_sqring already orders the store to
dropped before the update to SQ head.

Signed-off-by: Stefan Bühler <source@stbuehler.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 662f1c0..2ebc33c 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1846,8 +1846,6 @@ static bool io_get_sqring(struct io_ring_ctx *ctx, struct sqe_submit *s)
 	/* drop invalid entries */
 	ctx->cached_sq_head++;
 	ring->dropped++;
-	/* See comment at the top of this file */
-	smp_wmb();
 	return false;
 }