1 files changed, 14 insertions, 10 deletions

diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 476cb0c0b4a..ec4cb9f3e3b 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);
 
@@ -1355,17 +1360,16 @@ static void migrate_hrtimers(int cpu)
 	tick_cancel_sched_timer(cpu);
 
 	local_irq_disable();
-
-	spin_lock(&new_base->lock);
-	spin_lock(&old_base->lock);
+	double_spin_lock(&new_base->lock, &old_base->lock,
+			 smp_processor_id() < cpu);
 
 	for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
 		migrate_hrtimer_list(&old_base->clock_base[i],
 				     &new_base->clock_base[i]);
 	}
-	spin_unlock(&old_base->lock);
-	spin_unlock(&new_base->lock);
 
+	double_spin_unlock(&new_base->lock, &old_base->lock,
+			   smp_processor_id() < cpu);
 	local_irq_enable();
 	put_cpu_var(hrtimer_bases);
 }