1 files changed, 8 insertions, 2 deletions

diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index f60dd6ea8333..0cb0816036c5 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -1744,6 +1744,7 @@ int rcu_needs_cpu(int cpu, unsigned long *dj)
 static void rcu_prepare_for_idle(int cpu)
 {
 #ifndef CONFIG_RCU_NOCB_CPU_ALL
+        bool needwake;
         struct rcu_data *rdp;
         struct rcu_dynticks *rdtp = &per_cpu(rcu_dynticks, cpu);
         struct rcu_node *rnp;
@@ -1792,8 +1793,10 @@ static void rcu_prepare_for_idle(int cpu)
                 rnp = rdp->mynode;
                 raw_spin_lock(&rnp->lock); /* irqs already disabled. */
                 smp_mb__after_unlock_lock();
-                rcu_accelerate_cbs(rsp, rnp, rdp);
+                needwake = rcu_accelerate_cbs(rsp, rnp, rdp);
                 raw_spin_unlock(&rnp->lock); /* irqs remain disabled. */
+                if (needwake)
+                        rcu_gp_kthread_wake(rsp);
         }
 #endif /* #ifndef CONFIG_RCU_NOCB_CPU_ALL */
 }
@@ -2230,12 +2233,15 @@ static void rcu_nocb_wait_gp(struct rcu_data *rdp)
         unsigned long c;
         bool d;
         unsigned long flags;
+        bool needwake;
         struct rcu_node *rnp = rdp->mynode;
 
         raw_spin_lock_irqsave(&rnp->lock, flags);
         smp_mb__after_unlock_lock();
-        c = rcu_start_future_gp(rnp, rdp);
+        needwake = rcu_start_future_gp(rnp, rdp, &c);
         raw_spin_unlock_irqrestore(&rnp->lock, flags);
+        if (needwake)
+                rcu_gp_kthread_wake(rdp->rsp);
 
         /*
          * Wait for the grace period.  Do so interruptibly to avoid messing