powerpc/mm: Use PAGE_FACTOR
PAGE_FACTOR was defined to reflect the difference between configured page size and fixed 4KB page size. Replace (PAGE_SHIFT - HW_PAGE_SHIFT) with PAGE_FACTOR. Signed-off-by: NGavin Shan <gwshan@linux.vnet.ibm.com> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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