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    SubjectRe: [PATCH 4/8] mm: FOLL_DUMP replace FOLL_ANON
    Hugh Dickins wrote:
    > The "FOLL_ANON optimization" and its use_zero_page() test have caused
    > confusion and bugs: why does it test VM_SHARED? for the very good but
    > unsatisfying reason that VMware crashed without. As we look to maybe
    > reinstating anonymous use of the ZERO_PAGE, we need to sort this out.
    > Easily done: it's silly for __get_user_pages() and follow_page() to
    > be guessing whether it's safe to assume that they're being used for
    > a coredump (which can take a shortcut snapshot where other uses must
    > handle a fault) - just tell them with GUP_FLAGS_DUMP and FOLL_DUMP.
    > get_dump_page() doesn't even want a ZERO_PAGE: an error suits fine.
    > Signed-off-by: Hugh Dickins <>

    Acked-by: Rik van Riel <>

    All rights reversed.

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      Last update: 2009-09-08 21:03    [W:0.032 / U:3.016 seconds]
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