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    Subject[PATCH] powerpc/mm: Export HPAGE_SHIFT
    Drivers may want to take advantage of the large pages used for memory obtained
    from hugetlbfs. One example is mlx4_ib which can use much less MTT entries (in
    the order of HPAGE_SIZE / PAGE_SIZE) when registering such memory, thus scale
    significantly better when registering larger memory regions. Other drivers
    could also benefit from this.

    Signed-off-by: Eli Cohen <eli@mellanox.co.il>
    ---
    arch/powerpc/mm/hash_utils_64.c | 1 +
    1 files changed, 1 insertions(+), 0 deletions(-)

    diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
    index 8d5b475..6cff8c7 100644
    --- a/arch/powerpc/mm/hash_utils_64.c
    +++ b/arch/powerpc/mm/hash_utils_64.c
    @@ -104,6 +104,7 @@ int mmu_highuser_ssize = MMU_SEGSIZE_256M;
    u16 mmu_slb_size = 64;
    #ifdef CONFIG_HUGETLB_PAGE
    unsigned int HPAGE_SHIFT;
    +EXPORT_SYMBOL(HPAGE_SHIFT);
    #endif
    #ifdef CONFIG_PPC_64K_PAGES
    int mmu_ci_restrictions;
    --
    1.6.1


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