PUD_MASK           52 arch/x86/include/asm/pgtable_64_types.h #define PUD_MASK	(~(PUD_SIZE - 1))
PUD_MASK            8 include/asm-generic/4level-fixup.h #define PUD_MASK			PGDIR_MASK
PUD_MASK           18 include/asm-generic/pgtable-nopud.h #define PUD_MASK  	(~(PUD_SIZE-1))