3 files changed, 38 insertions, 9 deletions

diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index cb25649c6f50..87aa5ff931e0 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -11,6 +11,8 @@
 #include <linux/mm.h>
 #include <linux/time.h>
 #include <linux/timex.h>
+#include <linux/jiffies.h>
+#include <linux/hrtimer.h>
 
 #include <asm/div64.h>
 #include <asm/timex.h>
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index eadfce2fff74..8001d37071f5 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -243,11 +243,18 @@ void tick_broadcast_on_off(unsigned long reason, int *oncpu)
 {
         int cpu = get_cpu();
 
-        if (cpu == *oncpu)
-                tick_do_broadcast_on_off(&reason);
-        else
-                smp_call_function_single(*oncpu, tick_do_broadcast_on_off,
-                                         &reason, 1, 1);
+        if (!cpu_isset(*oncpu, cpu_online_map)) {
+                printk(KERN_ERR "tick-braodcast: ignoring broadcast for "
+                       "offline CPU #%d\n", *oncpu);
+        } else {
+
+                if (cpu == *oncpu)
+                        tick_do_broadcast_on_off(&reason);
+                else
+                        smp_call_function_single(*oncpu,
+                                                 tick_do_broadcast_on_off,
+                                                 &reason, 1, 1);
+        }
         put_cpu();
 }
 
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 3483e6cb9549..52db9e3c526e 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -167,9 +167,15 @@ void tick_nohz_stop_sched_tick(void)
                 goto end;
 
         cpu = smp_processor_id();
-        if (unlikely(local_softirq_pending()))
-                printk(KERN_ERR "NOHZ: local_softirq_pending %02x\n",
-                       local_softirq_pending());
+        if (unlikely(local_softirq_pending())) {
+                static int ratelimit;
+
+                if (ratelimit < 10) {
+                        printk(KERN_ERR "NOHZ: local_softirq_pending %02x\n",
+                               local_softirq_pending());
+                        ratelimit++;
+                }
+        }
 
         now = ktime_get();
         /*
@@ -241,6 +247,21 @@ void tick_nohz_stop_sched_tick(void)
                 if (cpu == tick_do_timer_cpu)
                         tick_do_timer_cpu = -1;
 
+                ts->idle_sleeps++;
+
+                /*
+                 * delta_jiffies >= NEXT_TIMER_MAX_DELTA signals that
+                 * there is no timer pending or at least extremly far
+                 * into the future (12 days for HZ=1000). In this case
+                 * we simply stop the tick timer:
+                 */
+                if (unlikely(delta_jiffies >= NEXT_TIMER_MAX_DELTA)) {
+                        ts->idle_expires.tv64 = KTIME_MAX;
+                        if (ts->nohz_mode == NOHZ_MODE_HIGHRES)
+                                hrtimer_cancel(&ts->sched_timer);
+                        goto out;
+                }
+
                 /*
                  * calculate the expiry time for the next timer wheel
                  * timer
@@ -248,7 +269,6 @@ void tick_nohz_stop_sched_tick(void)
                 expires = ktime_add_ns(last_update, tick_period.tv64 *
                                        delta_jiffies);
                 ts->idle_expires = expires;
-                ts->idle_sleeps++;
 
                 if (ts->nohz_mode == NOHZ_MODE_HIGHRES) {
                         hrtimer_start(&ts->sched_timer, expires,