PMD_MASKED_BITS 250 arch/powerpc/include/asm/book3s/64/pgtable.h #define PMD_MASKED_BITS 0xc0000000000000ffUL PMD_MASKED_BITS 45 arch/powerpc/include/asm/nohash/64/pgtable-4k.h #define PMD_MASKED_BITS 0