UNSTABLE_FLAG     218 mm/ksm.c       #define KSM_FLAG_MASK	(SEQNR_MASK|UNSTABLE_FLAG|STABLE_FLAG)
UNSTABLE_FLAG     798 mm/ksm.c       	} else if (rmap_item->address & UNSTABLE_FLAG) {
UNSTABLE_FLAG    1979 mm/ksm.c       	rmap_item->address |= UNSTABLE_FLAG;