timekeeping: Move reset of cycle_last for tsc clocksource to tsc

[safe/jmp/linux-2.6] / kernel / time / clockevents.c

diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c
index 3d1e3e1..a6dcd67 100644 (file)
--- a/kernel/time/clockevents.c
+++ b/kernel/time/clockevents.c
@@ -18,6 +18,7 @@
 #include <linux/notifier.h>
 #include <linux/smp.h>
 #include <linux/sysdev.h>
+#include <linux/tick.h>
 
 /* The registered clock event devices */
 static LIST_HEAD(clockevent_devices);
@@ -54,6 +55,7 @@ unsigned long clockevent_delta2ns(unsigned long latch,
 
        return (unsigned long) clc;
 }
+EXPORT_SYMBOL_GPL(clockevent_delta2ns);
 
 /**
  * clockevents_set_mode - set the operating mode of a clock event device
@@ -68,10 +70,31 @@ void clockevents_set_mode(struct clock_event_device *dev,
        if (dev->mode != mode) {
                dev->set_mode(mode, dev);
                dev->mode = mode;
+
+               /*
+                * A nsec2cyc multiplicator of 0 is invalid and we'd crash
+                * on it, so fix it up and emit a warning:
+                */
+               if (mode == CLOCK_EVT_MODE_ONESHOT) {
+                       if (unlikely(!dev->mult)) {
+                               dev->mult = 1;
+                               WARN_ON(1);
+                       }
+               }
        }
 }
 
 /**
+ * clockevents_shutdown - shutdown the device and clear next_event
+ * @dev:       device to shutdown
+ */
+void clockevents_shutdown(struct clock_event_device *dev)
+{
+       clockevents_set_mode(dev, CLOCK_EVT_MODE_SHUTDOWN);
+       dev->next_event.tv64 = KTIME_MAX;
+}
+
+/**
  * clockevents_program_event - Reprogram the clock event device.
  * @expires:   absolute expiry time (monotonic clock)
  *
@@ -156,14 +179,7 @@ static void clockevents_notify_released(void)
 void clockevents_register_device(struct clock_event_device *dev)
 {
        BUG_ON(dev->mode != CLOCK_EVT_MODE_UNUSED);
-       /*
-        * A nsec2cyc multiplicator of 0 is invalid and we'd crash
-        * on it, so fix it up and emit a warning:
-        */
-       if (unlikely(!dev->mult)) {
-               dev->mult = 1;
-               WARN_ON(1);
-       }
+       BUG_ON(!dev->cpumask);
 
        spin_lock(&clockevents_lock);
 
@@ -173,11 +189,12 @@ void clockevents_register_device(struct clock_event_device *dev)
 
        spin_unlock(&clockevents_lock);
 }
+EXPORT_SYMBOL_GPL(clockevents_register_device);
 
 /*
  * Noop handler when we shut down an event device
  */
-static void clockevents_handle_noop(struct clock_event_device *dev)
+void clockevents_handle_noop(struct clock_event_device *dev)
 {
 }
 
@@ -199,7 +216,6 @@ void clockevents_exchange_device(struct clock_event_device *old,
         * released list and do a notify add later.
         */
        if (old) {
-               old->event_handler = clockevents_handle_noop;
                clockevents_set_mode(old, CLOCK_EVT_MODE_UNUSED);
                list_del(&old->list);
                list_add(&old->list, &clockevents_released);
@@ -207,7 +223,7 @@ void clockevents_exchange_device(struct clock_event_device *old,
 
        if (new) {
                BUG_ON(new->mode != CLOCK_EVT_MODE_UNUSED);
-               clockevents_set_mode(new, CLOCK_EVT_MODE_SHUTDOWN);
+               clockevents_shutdown(new);
        }
        local_irq_restore(flags);
 }