Re: [PATCH v2.1 01/10] cpu: Introduce clear_tasks_mm_cpumask()helper

From: Peter Zijlstra
Date: Mon Mar 26 2012 - 04:00:11 EST

On Sun, 2012-03-25 at 19:42 +0200, Oleg Nesterov wrote:
> __cpu_disable() is called by __stop_machine(), we know that nobody
> can preempt us and other CPUs can do nothing.

It would be very good to not rely on that though, I would love to get
rid of the stop_machine usage in cpu hotplug some day.
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