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clock events: allow replacement of broadcast timer

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Change the broadcast timer, if a timer with higher rating becomes available.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Cc: Andi Kleen <ak@suse.de>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Venki Pallipadi 2007-10-12 23:04:23 +02:00 committed by Thomas Gleixner
parent 31c435d75e
commit 4a93232dab
2 changed files with 8 additions and 9 deletions
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13
kernel/time/tick-broadcast.c
View file

@ -64,8 +64,9 @@ static void tick_broadcast_start_periodic(struct clock_event_device *bc)
*/
int tick_check_broadcast_device(struct clock_event_device *dev)
{
if (tick_broadcast_device.evtdev ||
(dev->features & CLOCK_EVT_FEAT_C3STOP))
if ((tick_broadcast_device.evtdev &&
tick_broadcast_device.evtdev->rating >= dev->rating) ||
(dev->features & CLOCK_EVT_FEAT_C3STOP))
return 0;
clockevents_exchange_device(NULL, dev);
@ -513,11 +514,9 @@ static void tick_broadcast_clear_oneshot(int cpu)
*/
void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
{
if (bc->mode != CLOCK_EVT_MODE_ONESHOT) {
bc->event_handler = tick_handle_oneshot_broadcast;
clockevents_set_mode(bc, CLOCK_EVT_MODE_ONESHOT);
bc->next_event.tv64 = KTIME_MAX;
}
bc->event_handler = tick_handle_oneshot_broadcast;
clockevents_set_mode(bc, CLOCK_EVT_MODE_ONESHOT);
bc->next_event.tv64 = KTIME_MAX;
}
/*

4
kernel/time/tick-common.c
View file

@ -200,7 +200,7 @@ static int tick_check_new_device(struct clock_event_device *newdev)
cpu = smp_processor_id();
if (!cpu_isset(cpu, newdev->cpumask))
goto out;
goto out_bc;
td = &per_cpu(tick_cpu_device, cpu);
curdev = td->evtdev;
@ -265,7 +265,7 @@ static int tick_check_new_device(struct clock_event_device *newdev)
*/
if (tick_check_broadcast_device(newdev))
ret = NOTIFY_STOP;
out:
spin_unlock_irqrestore(&tick_device_lock, flags);
return ret;