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

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Message-ID: <20110607151242.GI1686@barrios-laptop>
Date:	Wed, 8 Jun 2011 00:12:42 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.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, Jun 07, 2011 at 04:07:03PM +0100, 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: Minchan Kim <minchan.kim@...il.com>

-- 
Kind regards
Minchan Kim
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