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    Subject[05/17] More compound page features
    Add a couple of more compound functions to avoid having to duplicate code in various places.

    Signed-off-by: Christoph Lameter <clameter@sgi.com>

    ---
    include/linux/mm.h | 15 +++++++++++++++
    1 file changed, 15 insertions(+)

    Index: linux-2.6.21-rc7/include/linux/mm.h
    ===================================================================
    --- linux-2.6.21-rc7.orig/include/linux/mm.h 2007-04-24 11:33:34.000000000 -0700
    +++ linux-2.6.21-rc7/include/linux/mm.h 2007-04-24 11:32:16.000000000 -0700
    @@ -330,6 +330,21 @@ static inline int compound_order(struct
    return (unsigned long)page[1].lru.prev;
    }

    +static inline int compound_pages(struct page *page)
    +{
    + return 1 << compound_order(page);
    +}
    +
    +static inline int compound_shift(struct page *page)
    +{
    + return PAGE_SHIFT + compound_order(page);
    +}
    +
    +static inline int compound_size(struct page *page)
    +{
    + return PAGE_SIZE << compound_order(page);
    +}
    +
    /*
    * Multiple processes may "see" the same page. E.g. for untouched
    * mappings of /dev/null, all processes see the same page full of
    --
    -
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