_PFN_MASK          92 arch/alpha/include/asm/pgtable.h #define _PFN_MASK	0xFFFFFFFF00000000UL
_PFN_MASK          61 arch/ia64/include/asm/pgtable.h #define _PFN_MASK		_PAGE_PPN_MASK
_PFN_MASK         182 arch/mips/include/asm/pgtable-bits.h #define _PFN_MASK		(~((1 << (_PFN_SHIFT)) - 1))