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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>
This commit is contained in:
Stefan Bühler 2019-04-24 23:54:20 +02:00 committed by Jens Axboe
parent 9e4c15a393
commit 82ab082c0e
1 changed files with 0 additions and 2 deletions
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2
fs/io_uring.c
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@ -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. * though the application is the one updating it.
*/ */
head = ctx->cached_sq_head; head = ctx->cached_sq_head;
/* See comment at the top of this file */
smp_rmb();
/* make sure SQ entry isn't read before tail */ /* make sure SQ entry isn't read before tail */
if (head == smp_load_acquire(&ring->r.tail)) if (head == smp_load_acquire(&ring->r.tail))
return false; return false;