enroll
enroll(lock->lo_type, lock->lo_name, LOCK_CLASS(lock));
static struct witness *enroll(const struct lock_type *, const char *,
lock->lo_witness = enroll(pending_locks[i].wh_type,
lock->lo_witness = enroll(type, lock->lo_name, class);
enroll(lock->lo_type, lock->lo_name, class);