1 files changed, 10 insertions, 5 deletions

diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index de93a8176ca6..ec4cb9f3e3b7 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -540,19 +540,19 @@ static inline int hrtimer_enqueue_reprogram(struct hrtimer *timer,
 /*
  * Switch to high resolution mode
  */
-static void hrtimer_switch_to_hres(void)
+static int hrtimer_switch_to_hres(void)
 {
         struct hrtimer_cpu_base *base = &__get_cpu_var(hrtimer_bases);
         unsigned long flags;
 
         if (base->hres_active)
-                return;
+                return 1;
 
         local_irq_save(flags);
 
         if (tick_init_highres()) {
                 local_irq_restore(flags);
-                return;
+                return 0;
         }
         base->hres_active = 1;
         base->clock_base[CLOCK_REALTIME].resolution = KTIME_HIGH_RES;
@@ -565,13 +565,14 @@ static void hrtimer_switch_to_hres(void)
         local_irq_restore(flags);
         printk(KERN_INFO "Switched to high resolution mode on CPU %d\n",
                smp_processor_id());
+        return 1;
 }
 
 #else
 
 static inline int hrtimer_hres_active(void) { return 0; }
 static inline int hrtimer_is_hres_enabled(void) { return 0; }
-static inline void hrtimer_switch_to_hres(void) { }
+static inline int hrtimer_switch_to_hres(void) { return 0; }
 static inline void hrtimer_force_reprogram(struct hrtimer_cpu_base *base) { }
 static inline int hrtimer_enqueue_reprogram(struct hrtimer *timer,
                                             struct hrtimer_clock_base *base)
@@ -1130,6 +1131,9 @@ static inline void run_hrtimer_queue(struct hrtimer_cpu_base *cpu_base,
                 if (base->softirq_time.tv64 <= timer->expires.tv64)
                         break;
 
+#ifdef CONFIG_HIGH_RES_TIMERS
+                WARN_ON_ONCE(timer->cb_mode == HRTIMER_CB_IRQSAFE_NO_SOFTIRQ);
+#endif
                 timer_stats_account_hrtimer(timer);
 
                 fn = timer->function;
@@ -1173,7 +1177,8 @@ void hrtimer_run_queues(void)
          * deadlock vs. xtime_lock.
          */
         if (tick_check_oneshot_change(!hrtimer_is_hres_enabled()))
-                hrtimer_switch_to_hres();
+                if (hrtimer_switch_to_hres())
+                        return;
 
         hrtimer_get_softirq_time(cpu_base);