On Tue, Jun 30, 2015 at 08:37:01PM -0700, Paul E. McKenney wrote: > > Wait, what? Why is anything using traditional (non-S) RCU while *any* > > lock is held? > > In their defense, it is a sleeplock that is never taken except when > rearranging networking configuration. Sometimes they need a grace period > under the lock. So synchronize_net() checks to see if RTNL is held, and > does a synchronize_rcu_expedited() if so and a synchronize_rcu() if not.
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