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    SubjectRe: [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@redhat.com>
    >
    > From: Andrea Arcangeli <aarcange@redhat.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@suse.de: Split out patch]
    > Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
    > Signed-off-by: Mel Gorman <mgorman@suse.de>

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


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