io_uring: adjust smp_rmb inside io_cqring_events
Whenever smp_rmb is required to use io_cqring_events, keep smp_rmb inside the function io_cqring_events. Signed-off-by: NJackie Liu <liuyun01@kylinos.cn> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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