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io_uring: remove unnecessary barrier before reading SQ tail
author
Stefan Bühler
<source@stbuehler.de>
Wed, 24 Apr 2019 21:54:20 +0000
(23:54 +0200)
committer
Jens Axboe
<axboe@kernel.dk>
Tue, 30 Apr 2019 15:40:02 +0000
(09:40 -0600)
There is no operation before to order with.
Signed-off-by: Stefan Bühler <source@stbuehler.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
fs/io_uring.c
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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;