On Thursday, July 26, 2012, Rafael J. Wysocki wrote: > On Thursday, July 26, 2012, Colin Cross wrote: > > On Thu, Jul 26, 2012 at 12:55 PM, Rafael J. Wysocki <r...@sisk.pl> wrote: > > > On Wednesday, July 25, 2012, Colin Cross wrote: > > >> The cpu hotplug notifier gets called in both atomic and non-atomic > > >> contexts, it is not always safe to lock a mutex. Filter out all events > > >> except the six necessary ones, which are all sleepable, before taking > > >> the mutex. > > > > > > I wonder what mutual exclusion mechanis we rely on when the mutex is not > > > taken? > > > > We don't need any mutual exclusion because the notifier returns immediately. > > Don't we need to disable preemption even?
Sorry, scratch that. It returns NOTIFY_OK if we're not going to take the mutex. Thanks, Rafael -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
