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    SubjectRe: [patch 2/3] mm: speculative get_page
    On Tue, 4 Apr 2006, Nick Piggin wrote:

    > + /*
    > + * PageNoNewRefs is set in order to prevent new references to the
    > + * page (eg. before it gets removed from pagecache). Wait until it
    > + * becomes clear (and checks below will ensure we still have the
    > + * correct one).
    > + */
    > + while (unlikely(PageNoNewRefs(page)))
    > + cpu_relax();

    That part looks suspiciously like we need some sort of lock here.
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