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>

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Almog Khaikin 2022-04-26 19:34:03 +03:00 • committed by Jens Axboe

parent ef060ea9e4

commit f2e030dd7a

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fs/io_uring.c

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