_PAGE_P           109 arch/alpha/include/asm/pgtable.h #define _PAGE_P(x) _PAGE_NORMAL((x) | (((x) & _PAGE_FOW)?0:_PAGE_FOW))
_PAGE_P            33 arch/ia64/include/asm/pgtable.h #define _PAGE_P			(1 << _PAGE_P_BIT)	/* page present bit */