4 files changed, 30 insertions, 5 deletions

diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 0a8ec5b2e208..ae5c9ea68662 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -100,6 +100,7 @@ static char rcu_kthreads_spawnable;
 
 static void rcu_node_kthread_setaffinity(struct rcu_node *rnp, int outgoingcpu);
 static void invoke_rcu_cpu_kthread(void);
+static void __invoke_rcu_cpu_kthread(void);
 
 #define RCU_KTHREAD_PRIO 1      /* RT priority for per-CPU kthreads. */
 
@@ -1442,13 +1443,21 @@ __rcu_process_callbacks(struct rcu_state *rsp, struct rcu_data *rdp)
         }
 
         /* If there are callbacks ready, invoke them. */
-        rcu_do_batch(rsp, rdp);
+        if (cpu_has_callbacks_ready_to_invoke(rdp))
+                __invoke_rcu_cpu_kthread();
+}
+
+static void rcu_kthread_do_work(void)
+{
+        rcu_do_batch(&rcu_sched_state, &__get_cpu_var(rcu_sched_data));
+        rcu_do_batch(&rcu_bh_state, &__get_cpu_var(rcu_bh_data));
+        rcu_preempt_do_callbacks();
 }
 
 /*
  * Do softirq processing for the current CPU.
  */
-static void rcu_process_callbacks(void)
+static void rcu_process_callbacks(struct softirq_action *unused)
 {
         __rcu_process_callbacks(&rcu_sched_state,
                                 &__get_cpu_var(rcu_sched_data));
@@ -1465,7 +1474,7 @@ static void rcu_process_callbacks(void)
  * the current CPU with interrupts disabled, the rcu_cpu_kthread_task
  * cannot disappear out from under us.
  */
-static void invoke_rcu_cpu_kthread(void)
+static void __invoke_rcu_cpu_kthread(void)
 {
         unsigned long flags;
 
@@ -1479,6 +1488,11 @@ static void invoke_rcu_cpu_kthread(void)
         local_irq_restore(flags);
 }
 
+static void invoke_rcu_cpu_kthread(void)
+{
+        raise_softirq(RCU_SOFTIRQ);
+}
+
 /*
  * Wake up the specified per-rcu_node-structure kthread.
  * Because the per-rcu_node kthreads are immortal, we don't need
@@ -1613,7 +1627,7 @@ static int rcu_cpu_kthread(void *arg)
                 *workp = 0;
                 local_irq_restore(flags);
                 if (work)
-                        rcu_process_callbacks();
+                        rcu_kthread_do_work();
                 local_bh_enable();
                 if (*workp != 0)
                         spincnt++;
@@ -2387,6 +2401,7 @@ void __init rcu_init(void)
         rcu_init_one(&rcu_sched_state, &rcu_sched_data);
         rcu_init_one(&rcu_bh_state, &rcu_bh_data);
         __rcu_init_preempt();
+         open_softirq(RCU_SOFTIRQ, rcu_process_callbacks);
 
         /*
          * We don't need protection against CPU-hotplug here because
diff --git a/kernel/rcutree.h b/kernel/rcutree.h
index 7b9a08b4aaea..0fed6b934d2a 100644
--- a/kernel/rcutree.h
+++ b/kernel/rcutree.h
@@ -439,6 +439,7 @@ static void rcu_preempt_offline_cpu(int cpu);
 #endif /* #ifdef CONFIG_HOTPLUG_CPU */
 static void rcu_preempt_check_callbacks(int cpu);
 static void rcu_preempt_process_callbacks(void);
+static void rcu_preempt_do_callbacks(void);
 void call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu));
 #if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_TREE_PREEMPT_RCU)
 static void rcu_report_exp_rnp(struct rcu_state *rsp, struct rcu_node *rnp);
diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
index ea2e2fb79e81..38d09c5f2b41 100644
--- a/kernel/rcutree_plugin.h
+++ b/kernel/rcutree_plugin.h
@@ -602,6 +602,11 @@ static void rcu_preempt_process_callbacks(void)
                                 &__get_cpu_var(rcu_preempt_data));
 }
 
+static void rcu_preempt_do_callbacks(void)
+{
+        rcu_do_batch(&rcu_preempt_state, &__get_cpu_var(rcu_preempt_data));
+}
+
 /*
  * Queue a preemptible-RCU callback for invocation after a grace period.
  */
@@ -997,6 +1002,10 @@ static void rcu_preempt_process_callbacks(void)
 {
 }
 
+static void rcu_preempt_do_callbacks(void)
+{
+}
+
 /*
  * Wait for an rcu-preempt grace period, but make it happen quickly.
  * But because preemptible RCU does not exist, map to rcu-sched.
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 13960170cad4..40cf63ddd4b3 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -58,7 +58,7 @@ DEFINE_PER_CPU(struct task_struct *, ksoftirqd);
 
 char *softirq_to_name[NR_SOFTIRQS] = {
         "HI", "TIMER", "NET_TX", "NET_RX", "BLOCK", "BLOCK_IOPOLL",
-        "TASKLET", "SCHED", "HRTIMER"
+        "TASKLET", "SCHED", "HRTIMER", "RCU"
 };
 
 /*