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    SubjectRe: [PATCH 2.5.63] Teach page_mapped about the anon flag
    Dave McCracken <dmccr@us.ibm.com> wrote:
    >
    >
    > --On Monday, March 03, 2003 13:12:10 -0800 Andrew Morton <akpm@digeo.com>
    > wrote:
    >
    > > It is. All callers which need to be 100% accurate are under
    > > pte_chain_lock().
    >
    > Hmm, good point. Some places may not need perfect accuracy. Also, if it
    > gives a false positive it means someone else is doing an atomic op on it,
    > so it's likely to be in transition to/from true anyway.
    >
    > Ok, you've convinced me. Please ignore the patch. I'll hang onto it in
    > case we get proved wrong at some point.

    We do need a patch I think. page_mapped() is still assuming that an
    all-bits-zero atomic_t corresponds to a zero-value atomic_t.

    This does appear to be true for all supported architectures, but it's a bit
    grubby.

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