linux-kernel - Re: [PATCH 2/4] mm: vmscan: Do not use page

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Message-ID: <20110608093827.GD6742@tiehlicka.suse.cz>
Date:	Wed, 8 Jun 2011 11:38:27 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Thomas Sattler <tsattler@....de>,
	Ury Stankevich <urykhy@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	linux-mm <linux-mm@...ck.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/4] mm: vmscan: Do not use page_count without a page pin

On Tue 07-06-11 16:07:03, Mel Gorman wrote:
> From: Andrea Arcangeli <aarcange@...hat.com>
> 
> From: Andrea Arcangeli <aarcange@...hat.com>
> 
> It is unsafe to run page_count during the physical pfn scan because
> compound_head could trip on a dangling pointer when reading
> page->first_page if the compound page is being freed by another CPU.
> 
> [mgorman@...e.de: Split out patch]
> Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
> Signed-off-by: Mel Gorman <mgorman@...e.de>

Reviewed-by: Michal Hocko <mhocko@...e.cz>
-- 
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic
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