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io_uring: remove unnecessary barrier after unsetting IORING_SQ_NEED_WAKEUP

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There is no operation to order with afterwards, and removing the flag is
not critical in any way.

There will always be a "race condition" where the application will
trigger IORING_ENTER_SQ_WAKEUP when it isn't actually needed.

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 23:54:22 +02:00 committed by Jens Axboe
parent b841f19524
commit 62977281a6
1 changed files with 0 additions and 2 deletions
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2
fs/io_uring.c
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@ -1969,13 +1969,11 @@ static int io_sq_thread(void *data)
finish_wait(&ctx->sqo_wait, &wait);
ctx->sq_ring->flags &= ~IORING_SQ_NEED_WAKEUP;
smp_wmb();
continue;
}
finish_wait(&ctx->sqo_wait, &wait);
ctx->sq_ring->flags &= ~IORING_SQ_NEED_WAKEUP;
smp_wmb();
}
i = 0;