Re: [PATCH] cpuidle: coupled: fix sleeping while atomic in cpu notifier

[Colin Cross]

On Thu, Jul 26, 2012 at 12:55 PM, Rafael J. Wysocki <rjw@xxxxxxx> 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.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/