On Wed, 2013-06-26 at 11:03 -0400, Steven Rostedt wrote: > > I tried this approach in early 2005, and testing did not go well: > > > > https://lkml.org/lkml/2005/3/17/199 > > > > For one thing, a lock acquired both within and surrounding an > > RCU-sched read-side critical section would result in deadlock. > > > > Or have things changed so that this now somehow works? > > Well, so far lockdep hasn't splatted on this. But that's not saying much > because I'm currently fighting the lockdep splats from other workqueue > related stuff. > > Seems that Tejun really doesn't like us RT folks ;-) If there are issues, we could make a rcu_read_lock_sched_rt() which for mainline will be rcu_read_lock_sched(), but for -rt will grab the lock. That way we can pick and choose the locations that this is required. -- Steve -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
