powerpc/mm: Add devmap support for ppc64
Add support for the devmap bit on PTEs and PMDs for PPC64 Book3S. This is used to differentiate device backed memory from transparent huge pages since they are handled in more or less the same manner by the core mm code. Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by:Oliver O'Halloran <oohall@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
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