rcu_segcblist_n_segment_cbs
long rcu_segcblist_n_segment_cbs(struct rcu_segcblist *rsclp);
WARN_ON_ONCE(count == 0 && rcu_segcblist_n_segment_cbs(&rdp->cblist) != 0);
WARN_ON_ONCE(!empty && rcu_segcblist_n_segment_cbs(&rdp->cblist) == 0);