PUD_SIZE           52 arch/x86/include/asm/pgtable_64_types.h #define PUD_MASK	(~(PUD_SIZE - 1))
PUD_SIZE           18 include/asm-generic/pgtable-nopud.h #define PUD_MASK  	(~(PUD_SIZE-1))
PUD_SIZE          283 include/asm-generic/pgtable.h ({	unsigned long __boundary = ((addr) + PUD_SIZE) & PUD_MASK;	\