linux-kernel - Re: mm: Do not iterate over NR_CPUS in __zone_pcp

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Message-ID: <4B95AD17.2030106@kernel.org>
Date:	Tue, 09 Mar 2010 11:06:15 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Pekka Enberg <penberg@...helsinki.fi>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
	Christoph Lameter <cl@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>
Subject: Re: mm: Do not iterate over NR_CPUS in __zone_pcp_update()

On 03/08/2010 10:29 PM, Pekka Enberg wrote:
> On Mon, Mar 8, 2010 at 11:21 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
>> __zone_pcp_update() iterates over NR_CPUS instead of limiting the
>> access to the possible cpus. This might result in access to
>> uninitialized areas as the per cpu allocator only populates the per
>> cpu memory for possible cpus.
>>
>> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> 
> Looks OK to me.
> 
> Acked-by: Pekka Enberg <penberg@...helsinki.fi>

Yeap, that's buggy.

Acked-by: Tejun Heo <tj@...nel.org>

I suppose this would go through the mm tree?

Thanks.

-- 
tejun
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