linux-kernel - Re: [RESEND PATCH v3] clocksource: exynos_mct: fix for sleeping in atomic ctx handling cpu hotplug notif.

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Date:	Mon, 29 Jun 2015 11:24:36 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>
cc:	Damian Eppel <d.eppel@...sung.com>, kgene@...nel.org,
	k.kozlowski@...sung.com, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, m.szyprowski@...sung.com,
	kyungmin.park@...sung.com, m.jabrzyk@...sung.com,
	stable@...r.kernel.org
Subject: Re: [RESEND PATCH v3] clocksource: exynos_mct: fix for sleeping in
 atomic ctx handling cpu hotplug notif.

On Mon, 29 Jun 2015, Daniel Lezcano wrote:

> On 06/26/2015 03:23 PM, Damian Eppel wrote:
> > This is to fix an issue of sleeping in atomic context when processing
> > hotplug notifications in Exynos MCT(Multi-Core Timer).
> > The issue was reproducible on Exynos 3250 (Rinato board) and Exynos 5420
> > (Arndale Octa board).
> > 
> > Whilst testing cpu hotplug events on kernel configured with DEBUG_PREEMPT
> > and DEBUG_ATOMIC_SLEEP we get following BUG message, caused by calling
> > request_irq() and free_irq() in the context of hotplug notification
> > (which is in this case atomic context).
> 
> Applied as a 4.2 fix.
> 
> Should it be tagged stable@ ?

I have that one queued in tip/timers/urgent already. Please check my
branches before picking up stuff.

Thanks,

	tglx

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