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: <CAJKOXPdcBOqW=X8bhodQwO-qBoeTdh7NznmC8NXpB-LB_dPY5g@mail.gmail.com>
Date:	Mon, 29 Jun 2015 20:50:19 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:	Damian Eppel <d.eppel@...sung.com>, tglx@...utronix.de,
	kgene@...nel.org, Kozik <k.kozlowski@...sung.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, kyungmin.park@...sung.com,
	m.jabrzyk@...sung.com, stable@...r.kernel.org,
	Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [RESEND PATCH v3] clocksource: exynos_mct: fix for sleeping in
 atomic ctx handling cpu hotplug notif.

2015-06-29 18:19 GMT+09:00 Daniel Lezcano <daniel.lezcano@...aro.org>:
> 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@ ?

The patch and commit in tip have cc-stable and fixes tags, so
everything is fine.

Thanks!
Krzysztof
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