diff --git a/kernel/rcutree.c b/kernel/rcutree.c

index ba06207..c38a882 100644

--- a/kernel/rcutree.c

+++ b/kernel/rcutree.c

@@ -1476,9 +1476,6 @@ static void rcu_process_callbacks(struct softirq_action *unused)

 				&__get_cpu_var(rcu_sched_data));

 	__rcu_process_callbacks(&rcu_bh_state, &__get_cpu_var(rcu_bh_data));

 	rcu_preempt_process_callbacks();

-

-	/* If we are last CPU on way to dyntick-idle mode, accelerate it. */

-	rcu_needs_cpu_flush();

 }

 /*

diff --git a/kernel/rcutree.h b/kernel/rcutree.h

index 01b2ccd..795f7fc 100644

--- a/kernel/rcutree.h

+++ b/kernel/rcutree.h

@@ -450,7 +450,6 @@ static int rcu_preempt_needs_cpu(int cpu);

 static void __cpuinit rcu_preempt_init_percpu_data(int cpu);

 static void rcu_preempt_send_cbs_to_online(void);

 static void __init __rcu_init_preempt(void);

-static void rcu_needs_cpu_flush(void);

 static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags);

 static void rcu_preempt_boost_start_gp(struct rcu_node *rnp);

 static void invoke_rcu_callbacks_kthread(void);

diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h

index 8aafbb8..b0254de 100644

--- a/kernel/rcutree_plugin.h

+++ b/kernel/rcutree_plugin.h

@@ -1907,15 +1907,6 @@ int rcu_needs_cpu(int cpu)

 	return rcu_needs_cpu_quick_check(cpu);

 }

-/*

- * Check to see if we need to continue a callback-flush operations to

- * allow the last CPU to enter dyntick-idle mode.  But fast dyntick-idle

- * entry is not configured, so we never do need to.

- */

-static void rcu_needs_cpu_flush(void)

-{

-}

-

 #else /* #if !defined(CONFIG_RCU_FAST_NO_HZ) */

 #define RCU_NEEDS_CPU_FLUSHES 5

@@ -1991,20 +1982,4 @@ int rcu_needs_cpu(int cpu)

 	return c;

 }

-/*

- * Check to see if we need to continue a callback-flush operations to

- * allow the last CPU to enter dyntick-idle mode.

- */

-static void rcu_needs_cpu_flush(void)

-{

-	int cpu = smp_processor_id();

-	unsigned long flags;

-

-	if (per_cpu(rcu_dyntick_drain, cpu) <= 0)

-		return;

-	local_irq_save(flags);

-	(void)rcu_needs_cpu(cpu);

-	local_irq_restore(flags);

-}

-

 #endif /* #else #if !defined(CONFIG_RCU_FAST_NO_HZ) */