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

From: [email-masked] (Peter Zijlstra)
Date: Mon, 26 Mar 2012 09:59:06 +0200

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.