ZONES_MASK 492 include/linux/mm.h return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK; ZONES_MASK 540 include/linux/mm.h page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT); ZONES_MASK 541 include/linux/mm.h page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT; ZONES_MASK 115 mm/mm_init.c or_mask = (ZONES_MASK << ZONES_PGSHIFT) | ZONES_MASK 118 mm/mm_init.c add_mask = (ZONES_MASK << ZONES_PGSHIFT) +