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Message-ID: <CAMQu2gwhHw7k-rtjFDMMqhjP=efDhWDW6=cQ0rFhFLqJ9k=FGA@mail.gmail.com> Date: Fri, 27 Jul 2012 00:54:39 +0200 From: "Shilimkar, Santosh" <santosh.shilimkar@...com> To: linux-kernel@...r.kernel.org Cc: Len Brown <lenb@...nel.org>, Len Brown <len.brown@...el.com>, Kevin Hilman <khilman@...com>, "Rafael J. Wysocki" <rjw@...k.pl>, Colin Cross <ccross@...roid.com> Subject: Re: [PATCH] cpuidle: coupled: fix sleeping while atomic in cpu notifier On Thu, Jul 26, 2012 at 9:25 AM, Shilimkar, Santosh <santosh.shilimkar@...com> wrote: > On Wed, Jul 25, 2012 at 11:20 PM, Colin Cross <ccross@...roid.com> 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. >> >> Signed-off-by: Colin Cross <ccross@...roid.com> >> --- > Agree. > Have you observed any lock-up ? > Colin explained me about cause of the issue in an off-list discussion. Thought of updating the thread in case some one wants to reproduce the issue. You get a warning during cpu hotplug in suspend if you turn on sleeping while atomic debugging option in kernel build and the patch fixes it. Regards Santosh -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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