Re: [PATCH 01/21] workqueue: fix race condition inschedule_on_each_cpu()

[Frederic Weisbecker]

On Tue, Nov 17, 2009 at 02:15:06AM +0900, Tejun Heo wrote:
> Commit 65a64464349883891e21e74af16c05d6e1eeb4e9 which allows
> schedule_on_each_cpu() to be called from keventd added a race
> condition.  schedule_on_each_cpu() may race with cpu hotplug and end
> up executing the function twice on a cpu.
> 
> Fix it by moving direct execution into the section protected with
> get/put_online_cpus().  While at it, update code such that direct
> execution is done after works have been scheduled for all other cpus
> and drop unnecessary cpu != orig test from flush loop.
> 
> Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
> Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
> Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
> ---


Shouldn't this patch go to .32 ?
This looks like an important fix.

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