io_uring: flush overflowed CQ events in the io_uring_poll()
In io_uring_poll() we must flush overflowed CQ events before to check if there are CQ events available, to avoid missing events. We call the io_cqring_events() that checks and flushes any overflow and returns the number of CQ events available. Signed-off-by: NStefano Garzarella <sgarzare@redhat.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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