Merge branch 'for-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

[karo-tx-linux.git] / kernel / time / tick-common.c

diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c
index f7c515595b42b2bf9794a8f3f4ee1f9a2c17df89..3ae6afa1eb98e71cc82272cd0a79a25101eff429 100644 (file)
--- a/kernel/time/tick-common.c
+++ b/kernel/time/tick-common.c
@@ -102,7 +102,7 @@ void tick_handle_periodic(struct clock_event_device *dev)
 
        tick_periodic(cpu);
 
-       if (dev->mode != CLOCK_EVT_MODE_ONESHOT)
+       if (dev->state != CLOCK_EVT_STATE_ONESHOT)
                return;
        for (;;) {
                /*
@@ -140,7 +140,7 @@ void tick_setup_periodic(struct clock_event_device *dev, int broadcast)
 
        if ((dev->features & CLOCK_EVT_FEAT_PERIODIC) &&
            !tick_broadcast_oneshot_active()) {
-               clockevents_set_mode(dev, CLOCK_EVT_MODE_PERIODIC);
+               clockevents_set_state(dev, CLOCK_EVT_STATE_PERIODIC);
        } else {
                unsigned long seq;
                ktime_t next;
@@ -150,7 +150,7 @@ void tick_setup_periodic(struct clock_event_device *dev, int broadcast)
                        next = tick_next_period;
                } while (read_seqretry(&jiffies_lock, seq));
 
-               clockevents_set_mode(dev, CLOCK_EVT_MODE_ONESHOT);
+               clockevents_set_state(dev, CLOCK_EVT_STATE_ONESHOT);
 
                for (;;) {
                        if (!clockevents_program_event(dev, next, false))
@@ -332,14 +332,16 @@ out_bc:
        tick_install_broadcast_device(newdev);
 }
 
+#ifdef CONFIG_HOTPLUG_CPU
 /*
  * Transfer the do_timer job away from a dying cpu.
  *
- * Called with interrupts disabled.
+ * Called with interrupts disabled. Not locking required. If
+ * tick_do_timer_cpu is owned by this cpu, nothing can change it.
  */
-void tick_handover_do_timer(int *cpup)
+void tick_handover_do_timer(void)
 {
-       if (*cpup == tick_do_timer_cpu) {
+       if (tick_do_timer_cpu == smp_processor_id()) {
                int cpu = cpumask_first(cpu_online_mask);
 
                tick_do_timer_cpu = (cpu < nr_cpu_ids) ? cpu :
@@ -354,9 +356,9 @@ void tick_handover_do_timer(int *cpup)
  * access the hardware device itself.
  * We just set the mode and remove it from the lists.
  */
-void tick_shutdown(unsigned int *cpup)
+void tick_shutdown(unsigned int cpu)
 {
-       struct tick_device *td = &per_cpu(tick_cpu_device, *cpup);
+       struct tick_device *td = &per_cpu(tick_cpu_device, cpu);
        struct clock_event_device *dev = td->evtdev;
 
        td->mode = TICKDEV_MODE_PERIODIC;
@@ -365,27 +367,42 @@ void tick_shutdown(unsigned int *cpup)
                 * Prevent that the clock events layer tries to call
                 * the set mode function!
                 */
+               dev->state = CLOCK_EVT_STATE_DETACHED;
                dev->mode = CLOCK_EVT_MODE_UNUSED;
                clockevents_exchange_device(dev, NULL);
                dev->event_handler = clockevents_handle_noop;
                td->evtdev = NULL;
        }
 }
+#endif
 
-void tick_suspend(void)
+/**
+ * tick_suspend_local - Suspend the local tick device
+ *
+ * Called from the local cpu for freeze with interrupts disabled.
+ *
+ * No locks required. Nothing can change the per cpu device.
+ */
+void tick_suspend_local(void)
 {
        struct tick_device *td = this_cpu_ptr(&tick_cpu_device);
 
        clockevents_shutdown(td->evtdev);
 }
 
-void tick_resume(void)
+/**
+ * tick_resume_local - Resume the local tick device
+ *
+ * Called from the local CPU for unfreeze or XEN resume magic.
+ *
+ * No locks required. Nothing can change the per cpu device.
+ */
+void tick_resume_local(void)
 {
        struct tick_device *td = this_cpu_ptr(&tick_cpu_device);
-       int broadcast = tick_resume_broadcast();
-
-       clockevents_set_mode(td->evtdev, CLOCK_EVT_MODE_RESUME);
+       bool broadcast = tick_resume_check_broadcast();
 
+       clockevents_tick_resume(td->evtdev);
        if (!broadcast) {
                if (td->mode == TICKDEV_MODE_PERIODIC)
                        tick_setup_periodic(td->evtdev, 0);
@@ -394,6 +411,35 @@ void tick_resume(void)
        }
 }
 
+/**
+ * tick_suspend - Suspend the tick and the broadcast device
+ *
+ * Called from syscore_suspend() via timekeeping_suspend with only one
+ * CPU online and interrupts disabled or from tick_unfreeze() under
+ * tick_freeze_lock.
+ *
+ * No locks required. Nothing can change the per cpu device.
+ */
+void tick_suspend(void)
+{
+       tick_suspend_local();
+       tick_suspend_broadcast();
+}
+
+/**
+ * tick_resume - Resume the tick and the broadcast device
+ *
+ * Called from syscore_resume() via timekeeping_resume with only one
+ * CPU online and interrupts disabled.
+ *
+ * No locks required. Nothing can change the per cpu device.
+ */
+void tick_resume(void)
+{
+       tick_resume_broadcast();
+       tick_resume_local();
+}
+
 static DEFINE_RAW_SPINLOCK(tick_freeze_lock);
 static unsigned int tick_freeze_depth;
 
@@ -411,12 +457,10 @@ void tick_freeze(void)
        raw_spin_lock(&tick_freeze_lock);
 
        tick_freeze_depth++;
-       if (tick_freeze_depth == num_online_cpus()) {
+       if (tick_freeze_depth == num_online_cpus())
                timekeeping_suspend();
-       } else {
-               tick_suspend();
-               tick_suspend_broadcast();
-       }
+       else
+               tick_suspend_local();
 
        raw_spin_unlock(&tick_freeze_lock);
 }
@@ -437,7 +481,7 @@ void tick_unfreeze(void)
        if (tick_freeze_depth == num_online_cpus())
                timekeeping_resume();
        else
-               tick_resume();
+               tick_resume_local();
 
        tick_freeze_depth--;