diff --git a/sys/kern/subr_turnstile.c b/sys/kern/subr_turnstile.c
--- a/sys/kern/subr_turnstile.c
+++ b/sys/kern/subr_turnstile.c
@@ -622,12 +622,6 @@
 	mtx_unlock_spin(&tc->tc_lock);
 }
 
-void
-turnstile_assert(struct turnstile *ts)
-{
-	MPASS(ts->ts_lockobj == NULL);
-}
-
 void
 turnstile_cancel(struct turnstile *ts)
 {
@@ -1059,36 +1053,6 @@
 	thread_unlock(td);
 }
 
-/*
- * Return the first thread in a turnstile.
- */
-struct thread *
-turnstile_head(struct turnstile *ts, int queue)
-{
-#ifdef INVARIANTS
-
-	MPASS(ts != NULL);
-	MPASS(queue == TS_SHARED_QUEUE || queue == TS_EXCLUSIVE_QUEUE);
-	mtx_assert(&ts->ts_lock, MA_OWNED);
-#endif
-	return (TAILQ_FIRST(&ts->ts_blocked[queue]));
-}
-
-/*
- * Returns true if a sub-queue of a turnstile is empty.
- */
-int
-turnstile_empty(struct turnstile *ts, int queue)
-{
-#ifdef INVARIANTS
-
-	MPASS(ts != NULL);
-	MPASS(queue == TS_SHARED_QUEUE || queue == TS_EXCLUSIVE_QUEUE);
-	mtx_assert(&ts->ts_lock, MA_OWNED);
-#endif
-	return (TAILQ_EMPTY(&ts->ts_blocked[queue]));
-}
-
 #ifdef DDB
 static void
 print_thread(struct thread *td, const char *prefix)
diff --git a/sys/sys/turnstile.h b/sys/sys/turnstile.h
--- a/sys/sys/turnstile.h
+++ b/sys/sys/turnstile.h
@@ -64,10 +64,6 @@
  * a turnstile is not tied to a specific thread and that the turnstile
  * released at thread destruction may not be the same turnstile that the
  * thread allocated when it was created.
- *
- * The highest priority thread blocked on a specified queue of a
- * turnstile can be obtained via turnstile_head().  A given queue can
- * also be queried to see if it is empty via turnstile_empty().
  */
 
 struct lock_object;
@@ -89,9 +85,7 @@
 void	turnstile_chain_unlock(struct lock_object *);
 void	turnstile_claim(struct turnstile *);
 void	turnstile_disown(struct turnstile *);
-int	turnstile_empty(struct turnstile *ts, int queue);
 void	turnstile_free(struct turnstile *);
-struct thread *turnstile_head(struct turnstile *, int);
 struct turnstile *turnstile_lookup(struct lock_object *);
 int	turnstile_signal(struct turnstile *, int);
 struct turnstile *turnstile_trywait(struct lock_object *);
@@ -100,6 +94,5 @@
 bool	turnstile_lock(struct turnstile *, struct lock_object **,
 	    struct thread **);
 void	turnstile_unlock(struct turnstile *, struct lock_object *);
-void	turnstile_assert(struct turnstile *);
 #endif	/* _KERNEL */
 #endif	/* _SYS_TURNSTILE_H_ */