On Fri, 2017-09-01 at 01:27 +0800, Ming Lei wrote: > Inside block layer, we need to support to allocate request with > RQF_PREEMPT even though queue is frozen. Hello Ming, Can patch 8/9 be reworked such that it doesn't need the new percpu_ref_is_dead() helper function, e.g. by checking q->mq_freeze_depth to check whether or not request processing has been frozen? Have you noticed that several blk-mq code paths already check q->mq_freeze_depth to check whether or not a queue is frozen? Thanks, Bart.
