On Wed, Jul 01, 2015 at 12:12:21PM +0200, Peter Zijlstra wrote:
> 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.
>
> Sounds vile.
OK, I'll bite. Exactly what seems especially vile about it?
Thanx, Paul
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