DMZ_RECLAIM
return !test_and_set_bit(DMZ_RECLAIM, &zone->flags);
clear_bit_unlock(DMZ_RECLAIM, &zone->flags);
wake_up_bit(&zone->flags, DMZ_RECLAIM);
wait_on_bit_timeout(&zone->flags, DMZ_RECLAIM, TASK_UNINTERRUPTIBLE, HZ);
#define dmz_in_reclaim(z) test_bit(DMZ_RECLAIM, &(z)->flags)