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clockevents: do not shutdown the oneshot broadcast device 

When a cpu goes offline it is removed from the broadcast masks. If the
mask becomes empty the code shuts down the broadcast device. This is
wrong, because the broadcast device needs to be ready for the online
cpu going idle (into a c-state, which stops the local apic timer).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2007-09-16 15:36:43 +02:00 committed by Thomas Gleixner
parent 07eec6af44
commit 31d9b3938c
1 changed files with 4 additions and 7 deletions
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11
kernel/time/tick-broadcast.c
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@ -560,20 +560,17 @@ void tick_broadcast_switch_to_oneshot(void)
*/
void tick_shutdown_broadcast_oneshot(unsigned int *cpup)
{
struct clock_event_device *bc;
unsigned long flags;
unsigned int cpu = *cpup;
spin_lock_irqsave(&tick_broadcast_lock, flags);
bc = tick_broadcast_device.evtdev;
/*
* Clear the broadcast mask flag for the dead cpu, but do not
* stop the broadcast device!
*/
cpu_clear(cpu, tick_broadcast_oneshot_mask);
if (tick_broadcast_device.mode == TICKDEV_MODE_ONESHOT) {
if (bc && cpus_empty(tick_broadcast_oneshot_mask))
clockevents_set_mode(bc, CLOCK_EVT_MODE_SHUTDOWN);
}
spin_unlock_irqrestore(&tick_broadcast_lock, flags);
}