schedule_on_each_cpu(): use preempt_disable()

[powerpc.git] / kernel / time / tick-common.c

diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c
index 0986a2b..a96ec9a 100644 (file)
--- a/kernel/time/tick-common.c
+++ b/kernel/time/tick-common.c
@@ -31,7 +31,7 @@ DEFINE_PER_CPU(struct tick_device, tick_cpu_device);
  */
 ktime_t tick_next_period;
 ktime_t tick_period;
-static int tick_do_timer_cpu = -1;
+int tick_do_timer_cpu __read_mostly = -1;
 DEFINE_SPINLOCK(tick_device_lock);
 
 /*
@@ -295,6 +295,35 @@ static void tick_shutdown(unsigned int *cpup)
                clockevents_exchange_device(dev, NULL);
                td->evtdev = NULL;
        }
+       /* Transfer the do_timer job away from this cpu */
+       if (*cpup == tick_do_timer_cpu) {
+               int cpu = first_cpu(cpu_online_map);
+
+               tick_do_timer_cpu = (cpu != NR_CPUS) ? cpu : -1;
+       }
+       spin_unlock_irqrestore(&tick_device_lock, flags);
+}
+
+static void tick_suspend(void)
+{
+       struct tick_device *td = &__get_cpu_var(tick_cpu_device);
+       unsigned long flags;
+
+       spin_lock_irqsave(&tick_device_lock, flags);
+       clockevents_set_mode(td->evtdev, CLOCK_EVT_MODE_SHUTDOWN);
+       spin_unlock_irqrestore(&tick_device_lock, flags);
+}
+
+static void tick_resume(void)
+{
+       struct tick_device *td = &__get_cpu_var(tick_cpu_device);
+       unsigned long flags;
+
+       spin_lock_irqsave(&tick_device_lock, flags);
+       if (td->mode == TICKDEV_MODE_PERIODIC)
+               tick_setup_periodic(td->evtdev, 0);
+       else
+               tick_resume_oneshot();
        spin_unlock_irqrestore(&tick_device_lock, flags);
 }
 
@@ -325,6 +354,16 @@ static int tick_notify(struct notifier_block *nb, unsigned long reason,
                tick_shutdown(dev);
                break;
 
+       case CLOCK_EVT_NOTIFY_SUSPEND:
+               tick_suspend();
+               tick_suspend_broadcast();
+               break;
+
+       case CLOCK_EVT_NOTIFY_RESUME:
+               if (!tick_resume_broadcast())
+                       tick_resume();
+               break;
+
        default:
                break;
        }