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authorThomas Gleixner <tglx@linutronix.de>2007-07-21 04:37:35 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-21 17:49:15 -0700
commit5590a536c0bc403fc73908c66c1c88cbed735ecb (patch)
treee07b89628885da86706a2ba0ce9d50cd7f4a0dfc /kernel
parent18de5bc4c1f1f1fa5e14f354a7603bd6e9d4e3b6 (diff)
clockevents: fix device replacement
When a device is replaced by a better rated device, then the broadcast mode needs to be evaluated again. When the new device has no requirement for broadcasting, then the broadcast bits for the CPU must be cleared. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: john stultz <johnstul@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/time/tick-broadcast.c29
1 files changed, 28 insertions, 1 deletions
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index 8339af229cb..db8e0f3d409 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -31,6 +31,12 @@ struct tick_device tick_broadcast_device;
static cpumask_t tick_broadcast_mask;
static DEFINE_SPINLOCK(tick_broadcast_lock);
+#ifdef CONFIG_TICK_ONESHOT
+static void tick_broadcast_clear_oneshot(int cpu);
+#else
+static inline void tick_broadcast_clear_oneshot(int cpu) { }
+#endif
+
/*
* Debugging: see timer_list.c
*/
@@ -99,8 +105,19 @@ int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu)
cpu_set(cpu, tick_broadcast_mask);
tick_broadcast_start_periodic(tick_broadcast_device.evtdev);
ret = 1;
- }
+ } else {
+ /*
+ * When the new device is not affected by the stop
+ * feature and the cpu is marked in the broadcast mask
+ * then clear the broadcast bit.
+ */
+ if (!(dev->features & CLOCK_EVT_FEAT_C3STOP)) {
+ int cpu = smp_processor_id();
+ cpu_clear(cpu, tick_broadcast_mask);
+ tick_broadcast_clear_oneshot(cpu);
+ }
+ }
spin_unlock_irqrestore(&tick_broadcast_lock, flags);
return ret;
}
@@ -487,6 +504,16 @@ out:
spin_unlock_irqrestore(&tick_broadcast_lock, flags);
}
+/*
+ * Reset the one shot broadcast for a cpu
+ *
+ * Called with tick_broadcast_lock held
+ */
+static void tick_broadcast_clear_oneshot(int cpu)
+{
+ cpu_clear(cpu, tick_broadcast_oneshot_mask);
+}
+
/**
* tick_broadcast_setup_highres - setup the broadcast device for highres
*/