mm: Update generic gup implementation to handle hugepage directory
Update generic gup implementation with powerpc specific details. On powerpc at pmd level we can have hugepte, normal pmd pointer or a pointer to the hugepage directory. Tested-by: NSteve Capper <steve.capper@linaro.org> Acked-by: NSteve Capper <steve.capper@linaro.org> Signed-off-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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