linux-kernel - Re: [PATCH 01/21] workqueue: fix race condition in schedule_on_each

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Message-ID: <20091116230427.GD5293@nowhere>
Date:	Tue, 17 Nov 2009 00:04:42 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	linux-kernel@...r.kernel.org, jeff@...zik.org, mingo@...e.hu,
	akpm@...ux-foundation.org, jens.axboe@...cle.com,
	rusty@...tcorp.com.au, cl@...ux-foundation.org,
	dhowells@...hat.com, arjan@...ux.intel.com,
	torvalds@...ux-foundation.org, avi@...hat.com,
	peterz@...radead.org, andi@...stfloor.org,
	Andi Kleen <ak@...ux.intel.com>,
	Oleg Nesterov <oleg@...hat.com>
Subject: Re: [PATCH 01/21] workqueue: fix race condition in
	schedule_on_each_cpu()

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@...nel.org>
> Cc: Andi Kleen <ak@...ux.intel.com>
> Cc: Oleg Nesterov <oleg@...hat.com>
> ---


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

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