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Date:	Thu, 14 Jun 2012 11:20:30 +0900
From:	Kamezawa Hiroyuki <>
To:	Minchan Kim <>
CC:	Andrew Morton <>,,,
	Andrea Arcangeli <>,
	Mel Gorman <>, Michal Hocko <>,
	Wanpeng Li <>
Subject: Re: [PATCH v2 1/2][BUGFIX] mm: do not use page_count without a page

(2012/06/14 10:12), Minchan Kim wrote:
> d179e84ba fixed the problem[1] in vmscan.c but same problem is here.
> Let's fix it.
> [1]
> I copy and paste d179e84ba's contents for description.
> "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."
> * changelog from v1
>    - Add comment about skip tail page of THP - Andrea
>    - fix typo - Wanpeng Li
>    - based on next-20120613
> Cc: Andrea Arcangeli<>
> Cc: Mel Gorman<>
> Cc: Michal Hocko<>
> Cc: KAMEZAWA Hiroyuki<>
> Cc: Wanpeng Li<>
> Signed-off-by: Minchan Kim<>

Reviewed-by: KAMEZAWA Hiroyuki <>

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