io_uring: remove unnecessary barrier before reading SQ tail

There is no operation before to order with.

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 d3c57ee..662f1c0 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1831,8 +1831,6 @@ static bool io_get_sqring(struct io_ring_ctx *ctx, struct sqe_submit *s)
         *    though the application is the one updating it.
         */
        head = ctx->cached_sq_head;
-       /* See comment at the top of this file */
-       smp_rmb();
        /* make sure SQ entry isn't read before tail */
        if (head == smp_load_acquire(&ring->r.tail))
                return false;