tree 2717e7d4dd781be2d57737df96b074451090f3d9
parent d0981a1b21a03866c8da7f44e35e389c2e0d6061
author Martin Schwidefsky <schwidefsky@de.ibm.com> 1250608182 +0200
committer Thomas Gleixner <tglx@linutronix.de> 1250676056 +0200

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>