int spa_checkpoint_discard(const char *);
boolean_t spa_checkpoint_discard_thread_check(void *, zthr_t *);
-int spa_checkpoint_discard_thread(void *, zthr_t *);
+void spa_checkpoint_discard_thread(void *, zthr_t *);
int spa_checkpoint_get_stats(spa_t *, pool_checkpoint_stat_t *);