Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=5590a536c0bc403fc73908c66c1c88cbed735ecb
Commit: 5590a536c0bc403fc73908c66c1c88cbed735ecb
Parent: 18de5bc4c1f1f1fa5e14f354a7603bd6e9d4e3b6
Author: Thomas Gleixner <[EMAIL PROTECTED]>
AuthorDate: Sat Jul 21 04:37:35 2007 -0700
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Sat Jul 21 17:49:15 2007 -0700
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 <[EMAIL PROTECTED]>
Cc: john stultz <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
kernel/time/tick-broadcast.c | 29 ++++++++++++++++++++++++++++-
1 files changed, 28 insertions(+), 1 deletions(-)
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index 8339af2..db8e0f3 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
*/
-
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