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 (file)
--- 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;
 }