rw_obj_alloc
do {(ifp)->if_afdata_lock = rw_obj_alloc();} while (0)
wg->wg_rwlock = rw_obj_alloc();
krwlock_t *rw_obj_alloc(void);
amap->am_lock = rw_obj_alloc();
aobj->u_obj.vmobjlock = rw_obj_alloc();
lockptr = rw_obj_alloc();
uo->vmobjlock = rw_obj_alloc();