/* Call with rcu_read_lock held. */
void ht_add(struct rcu_ht *ht, struct rcu_ht_node *node);
+/* Call with rcu_read_lock held. */
+int ht_add_unique(struct rcu_ht *ht, struct rcu_ht_node *node);
+
/* Call with rcu_read_lock held. */
int ht_remove(struct rcu_ht *ht, struct rcu_ht_node *node);