Messages in this thread | | | Date | Thu, 26 Jul 2012 12:51:17 -0700 | Subject | Re: [PATCH] cpuidle: coupled: fix sleeping while atomic in cpu notifier | From | Colin Cross <> |
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On Thu, Jul 26, 2012 at 12:55 PM, Rafael J. Wysocki <rjw@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.
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