On 03/26, Peter Zijlstra wrote:

On Sun, 2012-03-25 at 19:42 +0200, Oleg Nesterov wrote:

quoted

__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,

Yes, yes, perhaps I wasn't clear but I think the patches are fine.

I would love to get
rid of the stop_machine usage in cpu hotplug some day.

Interesting... Why? I mean, why do you dislike stop_machine() in
_cpu_down() ? Just curious.

Oleg.