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io_uring: replace smp_mb() with smp_mb__after_atomic() in io_sq_thread()

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The IORING_SQ_NEED_WAKEUP flag is now set using atomic_or() which
implies a full barrier on some architectures but it is not required to
do so. Use the more appropriate smp_mb__after_atomic() which avoids the
extra barrier on those architectures.

Signed-off-by: Almog Khaikin <almogkh@gmail.com>
Link: https://lore.kernel.org/r/20220426163403.112692-1-almogkh@gmail.com
Fixes: 8018823e6987 ("io_uring: serialize ctx->rings->sq_flags with atomic_or/and")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Almog Khaikin 2022-04-26 19:34:03 +03:00 committed by Jens Axboe
parent ef060ea9e4
commit f2e030dd7a
1 changed files with 1 additions and 1 deletions
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2
fs/io_uring.c
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@ -8229,7 +8229,7 @@ static int io_sq_thread(void *data)
* Ensure the store of the wakeup flag is not
* reordered with the load of the SQ tail
*/
smp_mb();
smp_mb__after_atomic();
if (io_sqring_entries(ctx)) {
needs_sched = false;