DADQ_LOCKPTR
#define DADQ_LOCK_INIT() rw_init(DADQ_LOCKPTR(), "nd6 DAD queue")
#define DADQ_RLOCK() rw_rlock(DADQ_LOCKPTR())
#define DADQ_RUNLOCK() rw_runlock(DADQ_LOCKPTR())
#define DADQ_WLOCK() rw_wlock(DADQ_LOCKPTR())
#define DADQ_WUNLOCK() rw_wunlock(DADQ_LOCKPTR())
#define DADQ_LOCK_ASSERT() rw_assert(DADQ_LOCKPTR(), RA_LOCKED);
#define DADQ_RLOCK_ASSERT() rw_assert(DADQ_LOCKPTR(), RA_RLOCKED);
#define DADQ_WLOCK_ASSERT() rw_assert(DADQ_LOCKPTR(), RA_WLOCKED);
callout_init_rw(&dp->dad_timer_ch, DADQ_LOCKPTR(),