diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h
index 99cf3a13954c..b43320b149d2 100644
--- a/kernel/rcu/tasks.h
+++ b/kernel/rcu/tasks.h
@@ -950,6 +950,9 @@ static void rcu_tasks_be_rude(struct work_struct *work)
 // Wait for one rude RCU-tasks grace period.
 static void rcu_tasks_rude_wait_gp(struct rcu_tasks *rtp)
 {
+	if (num_online_cpus() <= 1)
+		return;	// Fastpath for only one CPU.
+
 	rtp->n_ipis += cpumask_weight(cpu_online_mask);
 	schedule_on_each_cpu(rcu_tasks_be_rude);
 }