Re: [PATCH 2/4] mm: vmscan: Do not use page_count without a pagepin

[Minchan Kim]

On Tue, Jun 07, 2011 at 04:07:03PM +0100, Mel Gorman wrote:
> From: Andrea Arcangeli <aarcange@xxxxxxxxxx>
> 
> From: Andrea Arcangeli <aarcange@xxxxxxxxxx>
> 
> 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@xxxxxxx: Split out patch]
> Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
> Signed-off-by: Mel Gorman <mgorman@xxxxxxx>
Reviewed-by: Minchan Kim <minchan.kim@xxxxxxxxx>

-- 
Kind regards
Minchan Kim
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