Hey, On Tue, Mar 27, 2018 at 04:28:48PM +0200, Oleg Nesterov wrote: > > flush_*work() guarantees to wait for the completion of the latest > > instance of the work item which was visible to the caller. We can't > > guarantee that w/o rcu_barrier(). > > And this is what I can't understand. > > So let me repeat. Could you please describe a use-case which needs > flush_rcuwork() > with rcu_barrier() ?
So, if you skip that, flush_work() in itself won't wait for PENDING bit at all. It'll return right away if the work item is waiting for rcu grace period. Thanks. -- tejun
