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

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Message-ID: <55911A83.1080404@linaro.org>
Date:	Mon, 29 Jun 2015 12:14:27 +0200
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Thomas Gleixner <tglx@...utronix.de>
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 06/29/2015 11:24 AM, Thomas Gleixner wrote:
> 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.

Mmmh, yep. I thought I refreshed my branch. Now I see it.

Thanks for the heads up.

   -- Daniel

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