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

[Michal Hocko]

On Tue 07-06-11 16:07:03, 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: Michal Hocko <mhocko@xxxxxxx>
-- 
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic
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