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Subject[PATCH 38/38] clockevents: set event_handler to clockevents_handle_noop() in clockevents_exchange_device()
Date
All users of clockevents_handle_noop() are setting old->event_handler to it
after calling clockevents_exchange_device() and so it would be better if we can
do this at a single place. The only thing we need to make sure is, we preserve
it before calling clockevents_exchange_device() in case we need it.

As there are no external users of it, make it static.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
include/linux/clockchips.h | 2 --
kernel/time/clockevents.c | 3 ++-
kernel/time/tick-broadcast.c | 2 --
kernel/time/tick-common.c | 11 +++++------
4 files changed, 7 insertions(+), 11 deletions(-)

diff --git a/include/linux/clockchips.h b/include/linux/clockchips.h
index 2e4cb67..7e492ad 100644
--- a/include/linux/clockchips.h
+++ b/include/linux/clockchips.h
@@ -165,8 +165,6 @@ extern void clockevents_set_mode(struct clock_event_device *dev,
extern int clockevents_program_event(struct clock_event_device *dev,
ktime_t expires, bool force);

-extern void clockevents_handle_noop(struct clock_event_device *dev);
-
static inline void
clockevents_calc_mult_shift(struct clock_event_device *ce, u32 freq, u32 minsec)
{
diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c
index d80e891..757dae8 100644
--- a/kernel/time/clockevents.c
+++ b/kernel/time/clockevents.c
@@ -480,7 +480,7 @@ int clockevents_update_freq(struct clock_event_device *dev, u32 freq)
/*
* Noop handler when we shut down an event device
*/
-void clockevents_handle_noop(struct clock_event_device *dev)
+static void clockevents_handle_noop(struct clock_event_device *dev)
{
}

@@ -506,6 +506,7 @@ void clockevents_exchange_device(struct clock_event_device *old,
clockevents_set_mode(old, CLOCK_EVT_MODE_UNUSED);
list_del(&old->list);
list_add(&old->list, &clockevents_released);
+ old->event_handler = clockevents_handle_noop;
}

if (new) {
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index 9d81a81..bb96da7 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -95,8 +95,6 @@ void tick_install_broadcast_device(struct clock_event_device *dev)
return;

clockevents_exchange_device(cur, dev);
- if (cur)
- cur->event_handler = clockevents_handle_noop;
tick_broadcast_device.evtdev = dev;
if (!cpumask_empty(tick_broadcast_mask))
tick_broadcast_start_periodic(dev);
diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c
index e1b2947..b0d14e3 100644
--- a/kernel/time/tick-common.c
+++ b/kernel/time/tick-common.c
@@ -145,11 +145,11 @@ void tick_setup_periodic(struct clock_event_device *dev, int broadcast)
* Setup the tick device
*/
static void tick_setup_device(struct tick_device *td,
- struct clock_event_device *newdev, int cpu)
+ struct clock_event_device *newdev, int cpu,
+ void (*handler)(struct clock_event_device *))
{
const struct cpumask *cpumask = cpumask_of(cpu);
ktime_t next_event;
- void (*handler)(struct clock_event_device *) = NULL;

/*
* First device setup ?
@@ -173,9 +173,7 @@ static void tick_setup_device(struct tick_device *td,
*/
td->mode = TICKDEV_MODE_PERIODIC;
} else {
- handler = td->evtdev->event_handler;
next_event = td->evtdev->next_event;
- td->evtdev->event_handler = clockevents_handle_noop;
}

td->evtdev = newdev;
@@ -206,10 +204,12 @@ static void tick_setup_device(struct tick_device *td,
void tick_install_replacement(struct clock_event_device *newdev)
{
struct tick_device *td = tick_get_cpu_device();
+ void (*handler)(struct clock_event_device *) =
+ td->evtdev->event_handler;
int cpu = smp_processor_id();

clockevents_exchange_device(td->evtdev, newdev);
- tick_setup_device(td, newdev, cpu);
+ tick_setup_device(td, newdev, cpu, handler);
if (newdev->features & CLOCK_EVT_FEAT_ONESHOT)
tick_oneshot_notify();
}
@@ -335,7 +335,6 @@ void tick_shutdown(unsigned int *cpup)
* the set mode function!
*/
clockevents_exchange_device(dev, NULL);
- dev->event_handler = clockevents_handle_noop;
td->evtdev = NULL;
}
}
--
1.7.12.rc2.18.g61b472e


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