On Wed, Aug 26, 2020 at 03:51:25PM +0800, Chao Leng wrote: > It doesn't matter. Because the reentry of quiesce&unquiesce queue is not > safe, must be avoided by other mechanism. otherwise, exceptions may > occur. Introduce mq_quiesce_lock looks saving possible synchronization > waits, but it should not happen. If really happen, we need fix it. Sagi mentioned there may be nested queue quiesce, so I add .mq_quiesce_lock to make this usage easy to support, meantime avoid percpu_ref warning in such usage. Anyway, not see any problem with adding .mq_quiesce_lock, so I'd suggest to move on with this way. Thanks, Ming
