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

Krzysztof Kozlowski k.kozlowski at samsung.com
Mon Jun 29 04:50:19 PDT 2015

2015-06-29 18:19 GMT+09:00 Daniel Lezcano <daniel.lezcano at linaro.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.


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