On 9/8/21 1:49 PM, Pavel Begunkov wrote: > In case of !SQPOLL, io_cqring_ev_posted_iopoll() doesn't provide a > memory barrier required by waitqueue_active(&ctx->poll_wait). There is > a wq_has_sleeper(), which does smb_mb() inside, but it's called only for > SQPOLL. We can probably get rid of the need to even do so by having the slow path (eg someone waiting on cq_wait or poll_wait) a bit more expensive, but this should do for now. -- Jens Axboe
