io_uring: use wait_event_interruptible for cq_wait conditional wait
The previous patch has ensured that io_cqring_events contain smp_rmb memory barriers, Now we can use wait_event_interruptible to keep the code simple. Signed-off-by: Jackie Liu <liuyun01@kylinos.cn> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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