5 files changed, 25 insertions, 18 deletions

diff --git a/include/linux/jiffies.h b/include/linux/jiffies.h
index d235e88cfd7c..1f44466c1e9d 100644
--- a/include/linux/jiffies.h
+++ b/include/linux/jiffies.h
@@ -294,6 +294,12 @@ extern unsigned long preset_lpj;
  */
 extern unsigned int jiffies_to_msecs(const unsigned long j);
 extern unsigned int jiffies_to_usecs(const unsigned long j);
+
+static inline u64 jiffies_to_nsecs(const unsigned long j)
+{
+        return (u64)jiffies_to_usecs(j) * NSEC_PER_USEC;
+}
+
 extern unsigned long msecs_to_jiffies(const unsigned int m);
 extern unsigned long usecs_to_jiffies(const unsigned int u);
 extern unsigned long timespec_to_jiffies(const struct timespec *value);
diff --git a/include/linux/tick.h b/include/linux/tick.h
index 0175d8663b6c..b84773cb9f4c 100644
--- a/include/linux/tick.h
+++ b/include/linux/tick.h
@@ -104,7 +104,7 @@ extern struct cpumask *tick_get_broadcast_oneshot_mask(void);
 extern void tick_clock_notify(void);
 extern int tick_check_oneshot_change(int allow_nohz);
 extern struct tick_sched *tick_get_tick_sched(int cpu);
-extern void tick_check_idle(void);
+extern void tick_irq_enter(void);
 extern int tick_oneshot_mode_active(void);
 #  ifndef arch_needs_cpu
 #   define arch_needs_cpu(cpu) (0)
@@ -112,7 +112,7 @@ extern int tick_oneshot_mode_active(void);
 # else
 static inline void tick_clock_notify(void) { }
 static inline int tick_check_oneshot_change(int allow_nohz) { return 0; }
-static inline void tick_check_idle(void) { }
+static inline void tick_irq_enter(void) { }
 static inline int tick_oneshot_mode_active(void) { return 0; }
 # endif
 
@@ -121,7 +121,7 @@ static inline void tick_init(void) { }
 static inline void tick_cancel_sched_timer(int cpu) { }
 static inline void tick_clock_notify(void) { }
 static inline int tick_check_oneshot_change(int allow_nohz) { return 0; }
-static inline void tick_check_idle(void) { }
+static inline void tick_irq_enter(void) { }
 static inline int tick_oneshot_mode_active(void) { return 0; }
 #endif /* !CONFIG_GENERIC_CLOCKEVENTS */
 
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 656cd70eb577..b46131ef6aab 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2476,7 +2476,7 @@ u64 scheduler_tick_max_deferment(void)
         if (time_before_eq(next, now))
                 return 0;
 
-        return jiffies_to_usecs(next - now) * NSEC_PER_USEC;
+        return jiffies_to_nsecs(next - now);
 }
 #endif
 
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 850967068aaf..490fcbb1dc5b 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -328,7 +328,7 @@ void irq_enter(void)
                  * here, as softirq will be serviced on return from interrupt.
                  */
                 local_bh_disable();
-                tick_check_idle();
+                tick_irq_enter();
                 _local_bh_enable();
         }
 
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 08cb0c3b8ccb..9f8af69c67ec 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -533,12 +533,13 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts,
         struct clock_event_device *dev = __get_cpu_var(tick_cpu_device).evtdev;
         u64 time_delta;
 
+        time_delta = timekeeping_max_deferment();
+
         /* Read jiffies and the time when jiffies were updated last */
         do {
                 seq = read_seqbegin(&jiffies_lock);
                 last_update = last_jiffies_update;
                 last_jiffies = jiffies;
-                time_delta = timekeeping_max_deferment();
         } while (read_seqretry(&jiffies_lock, seq));
 
         if (rcu_needs_cpu(cpu, &rcu_delta_jiffies) ||
@@ -678,18 +679,18 @@ out:
 static void tick_nohz_full_stop_tick(struct tick_sched *ts)
 {
 #ifdef CONFIG_NO_HZ_FULL
-       int cpu = smp_processor_id();
+        int cpu = smp_processor_id();
 
-       if (!tick_nohz_full_cpu(cpu) || is_idle_task(current))
-               return;
+        if (!tick_nohz_full_cpu(cpu) || is_idle_task(current))
+                return;
 
-       if (!ts->tick_stopped && ts->nohz_mode == NOHZ_MODE_INACTIVE)
-               return;
+        if (!ts->tick_stopped && ts->nohz_mode == NOHZ_MODE_INACTIVE)
+                return;
 
-       if (!can_stop_full_tick())
-               return;
+        if (!can_stop_full_tick())
+                return;
 
-       tick_nohz_stop_sched_tick(ts, ktime_get(), cpu);
+        tick_nohz_stop_sched_tick(ts, ktime_get(), cpu);
 #endif
 }
 
@@ -1023,7 +1024,7 @@ static void tick_nohz_kick_tick(struct tick_sched *ts, ktime_t now)
 #endif
 }
 
-static inline void tick_check_nohz_this_cpu(void)
+static inline void tick_nohz_irq_enter(void)
 {
         struct tick_sched *ts = &__get_cpu_var(tick_cpu_sched);
         ktime_t now;
@@ -1042,17 +1043,17 @@ static inline void tick_check_nohz_this_cpu(void)
 #else
 
 static inline void tick_nohz_switch_to_nohz(void) { }
-static inline void tick_check_nohz_this_cpu(void) { }
+static inline void tick_nohz_irq_enter(void) { }
 
 #endif /* CONFIG_NO_HZ_COMMON */
 
 /*
  * Called from irq_enter to notify about the possible interruption of idle()
  */
-void tick_check_idle(void)
+void tick_irq_enter(void)
 {
         tick_check_oneshot_broadcast_this_cpu();
-        tick_check_nohz_this_cpu();
+        tick_nohz_irq_enter();
 }
 
 /*