1 files changed, 14 insertions, 10 deletions

diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 430e1b6901cc..60c9c60e9108 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -271,11 +271,11 @@ u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time)
 }
 EXPORT_SYMBOL_GPL(get_cpu_iowait_time_us);
 
-static void tick_nohz_stop_sched_tick(struct tick_sched *ts,
-                                      ktime_t now, int cpu)
+static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts,
+                                         ktime_t now, int cpu)
 {
         unsigned long seq, last_jiffies, next_jiffies, delta_jiffies;
-        ktime_t last_update, expires;
+        ktime_t last_update, expires, ret = { .tv64 = 0 };
         struct clock_event_device *dev = __get_cpu_var(tick_cpu_device).evtdev;
         u64 time_delta;
 
@@ -358,6 +358,8 @@ static void tick_nohz_stop_sched_tick(struct tick_sched *ts,
                 if (ts->tick_stopped && ktime_equal(expires, dev->next_event))
                         goto out;
 
+                ret = expires;
+
                 /*
                  * nohz_stop_sched_tick can be called several times before
                  * the nohz_restart_sched_tick is called. This happens when
@@ -372,11 +374,6 @@ static void tick_nohz_stop_sched_tick(struct tick_sched *ts,
                         ts->tick_stopped = 1;
                 }
 
-                ts->idle_sleeps++;
-
-                /* Mark expires */
-                ts->idle_expires = expires;
-
                 /*
                  * If the expiration time == KTIME_MAX, then
                  * in this case we simply stop the tick timer.
@@ -407,6 +404,8 @@ out:
         ts->next_jiffies = next_jiffies;
         ts->last_jiffies = last_jiffies;
         ts->sleep_length = ktime_sub(dev->next_event, now);
+
+        return ret;
 }
 
 static bool can_stop_idle_tick(int cpu, struct tick_sched *ts)
@@ -445,7 +444,7 @@ static bool can_stop_idle_tick(int cpu, struct tick_sched *ts)
 
 static void __tick_nohz_idle_enter(struct tick_sched *ts)
 {
-        ktime_t now;
+        ktime_t now, expires;
         int cpu = smp_processor_id();
 
         now = tick_nohz_start_idle(cpu, ts);
@@ -454,7 +453,12 @@ static void __tick_nohz_idle_enter(struct tick_sched *ts)
                 int was_stopped = ts->tick_stopped;
 
                 ts->idle_calls++;
-                tick_nohz_stop_sched_tick(ts, now, cpu);
+
+                expires = tick_nohz_stop_sched_tick(ts, now, cpu);
+                if (expires.tv64 > 0LL) {
+                        ts->idle_sleeps++;
+                        ts->idle_expires = expires;
+                }
 
                 if (!was_stopped && ts->tick_stopped)
                         ts->idle_jiffies = ts->last_jiffies;