diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h
index 24b5f2c2de87..4c53a2ccf711 100644
--- a/kernel/rcu/rcu.h
+++ b/kernel/rcu/rcu.h
@@ -538,10 +538,8 @@ extern struct workqueue_struct *rcu_par_gp_wq;
 #endif /* #else #ifdef CONFIG_TINY_RCU */
 
 #ifdef CONFIG_RCU_NOCB_CPU
-bool rcu_is_nocb_cpu(int cpu);
 void rcu_bind_current_to_nocb(void);
 #else
-static inline bool rcu_is_nocb_cpu(int cpu) { return false; }
 static inline void rcu_bind_current_to_nocb(void) { }
 #endif
 
diff --git a/kernel/rcu/tree_nocb.h b/kernel/rcu/tree_nocb.h
index 636d0546a4e9..02e1d05a11fc 100644
--- a/kernel/rcu/tree_nocb.h
+++ b/kernel/rcu/tree_nocb.h
@@ -215,14 +215,6 @@ static void rcu_init_one_nocb(struct rcu_node *rnp)
 	init_swait_queue_head(&rnp->nocb_gp_wq[1]);
 }
 
-/* Is the specified CPU a no-CBs CPU? */
-bool rcu_is_nocb_cpu(int cpu)
-{
-	if (cpumask_available(rcu_nocb_mask))
-		return cpumask_test_cpu(cpu, rcu_nocb_mask);
-	return false;
-}
-
 static bool __wake_nocb_gp(struct rcu_data *rdp_gp,
 			   struct rcu_data *rdp,
 			   bool force, unsigned long flags)