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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