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Subject: Re: [PATCH] Make sure timers have migrated before killing
 migration_thread
From: Peter Zijlstra <peterz@infradead.org>
To: "Amit K. Arora" <aarora@linux.vnet.ibm.com>
Cc: tj@kernel.org, Ingo Molnar <mingo@elte.hu>,
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Date: Mon, 24 May 2010 15:28:45 +0200
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On Mon, 2010-05-24 at 15:29 +0530, Amit K. Arora wrote:
> since _cpu_up() and _cpu_down() can never run in
> parallel, because of cpu_add_remove_lock. 

Ah indeed. I guess your initial patch works then.