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clockevents: Split out selection logic

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Split out the clockevent device selection logic. Preparatory patch to
allow unbinding active clockevent devices.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Magnus Damm <magnus.damm@gmail.com>
Link: http://lkml.kernel.org/r/20130425143436.431796247@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner
2013-04-25 20:31:50 +00:00
parent 501f867064
commit 45cb8e01b2
2 changed files with 56 additions and 38 deletions
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25
kernel/time/tick-broadcast.c
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@@ -65,19 +65,34 @@ static void tick_broadcast_start_periodic(struct clock_event_device *bc)
/*
* Check, if the device can be utilized as broadcast device:
*/
static bool tick_check_broadcast_device(struct clock_event_device *curdev,
struct clock_event_device *newdev)
{
if ((newdev->features & CLOCK_EVT_FEAT_DUMMY) ||
(newdev->features & CLOCK_EVT_FEAT_C3STOP))
return false;
if (tick_broadcast_device.mode == TICKDEV_MODE_ONESHOT &&
!(newdev->features & CLOCK_EVT_FEAT_ONESHOT))
return false;
return !curdev || newdev->rating > curdev->rating;
}
/*
* Conditionally install/replace broadcast device
*/
void tick_install_broadcast_device(struct clock_event_device *dev)
{
struct clock_event_device *cur = tick_broadcast_device.evtdev;
if ((dev->features & CLOCK_EVT_FEAT_DUMMY) ||
(tick_broadcast_device.evtdev &&
tick_broadcast_device.evtdev->rating >= dev->rating) ||
(dev->features & CLOCK_EVT_FEAT_C3STOP))
if (!tick_check_broadcast_device(cur, dev))
return;
if (!try_module_get(dev->owner))
return;
clockevents_exchange_device(tick_broadcast_device.evtdev, dev);
clockevents_exchange_device(cur, dev);
if (cur)
cur->event_handler = clockevents_handle_noop;
tick_broadcast_device.evtdev = dev;