From: Martin Schwidefsky <schwidefsky@de.ibm.com>
Date: Tue, 18 Aug 2009 15:09:42 +0000 (+0200)
Subject: clocksource: Avoid clocksource watchdog circular locking dependency
X-Git-Tag: v2.6.32-rc1~168^2~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=01548f4d3e8e94caf323a4f664eb347fd34a34ab;p=pandora-kernel.git

clocksource: Avoid clocksource watchdog circular locking dependency

stop_machine from a multithreaded workqueue is not allowed because
of a circular locking dependency between cpu_down and the workqueue
execution. Use a kernel thread to do the clocksource downgrade.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: john stultz <johnstul@us.ibm.com>
LKML-Reference: <20090818170942.3ab80c91@skybase>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---

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