PMD_MASKED_BITS   997 arch/powerpc/include/asm/book3s/64/pgtable.h #define pmd_page_vaddr(pmd)	__va(pmd_val(pmd) & ~PMD_MASKED_BITS)
PMD_MASKED_BITS   147 arch/powerpc/include/asm/nohash/64/pgtable.h #define pmd_page_vaddr(pmd)	(pmd_val(pmd) & ~PMD_MASKED_BITS)