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Commit b352bc1c authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

tick: Convert broadcast cpu bitmaps to cpumask_var_t 



Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20130306111537.366394000@linutronix.de
Cc: Rusty Russell <rusty@rustcorp.com.au>
parent ad2b1353

kernel/time/tick-broadcast.c

+43 −43
Original line number Diff line number Diff line
@@ -28,9 +28,8 @@ 
 */



static struct tick_device tick_broadcast_device;

/* FIXME: Use cpumask_var_t. */

static DECLARE_BITMAP(tick_broadcast_mask, NR_CPUS);

static DECLARE_BITMAP(tmpmask, NR_CPUS);

static cpumask_var_t tick_broadcast_mask;

static cpumask_var_t tmpmask;

static DEFINE_RAW_SPINLOCK(tick_broadcast_lock);

static int tick_broadcast_force;
@@ -50,7 +49,7 @@ struct tick_device *tick_get_broadcast_device(void) 


struct cpumask *tick_get_broadcast_mask(void)

{

	return to_cpumask(tick_broadcast_mask);

	return tick_broadcast_mask;

}



/*
@@ -74,7 +73,7 @@ int tick_check_broadcast_device(struct clock_event_device *dev) 


	clockevents_exchange_device(tick_broadcast_device.evtdev, dev);

	tick_broadcast_device.evtdev = dev;

	if (!cpumask_empty(tick_get_broadcast_mask()))

	if (!cpumask_empty(tick_broadcast_mask))

		tick_broadcast_start_periodic(dev);

	return 1;

}
@@ -123,7 +122,7 @@ int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu) 
	if (!tick_device_is_functional(dev)) {

		dev->event_handler = tick_handle_periodic;

		tick_device_setup_broadcast_func(dev);

		cpumask_set_cpu(cpu, tick_get_broadcast_mask());

		cpumask_set_cpu(cpu, tick_broadcast_mask);

		tick_broadcast_start_periodic(tick_broadcast_device.evtdev);

		ret = 1;

	} else {
@@ -134,7 +133,7 @@ int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu) 
		 */

		if (!(dev->features & CLOCK_EVT_FEAT_C3STOP)) {

			int cpu = smp_processor_id();

			cpumask_clear_cpu(cpu, tick_get_broadcast_mask());

			cpumask_clear_cpu(cpu, tick_broadcast_mask);

			tick_broadcast_clear_oneshot(cpu);

		} else {

			tick_device_setup_broadcast_func(dev);
@@ -198,9 +197,8 @@ static void tick_do_periodic_broadcast(void) 
{

	raw_spin_lock(&tick_broadcast_lock);



	cpumask_and(to_cpumask(tmpmask),

		    cpu_online_mask, tick_get_broadcast_mask());

	tick_do_broadcast(to_cpumask(tmpmask));

	cpumask_and(tmpmask, cpu_online_mask, tick_broadcast_mask);

	tick_do_broadcast(tmpmask);



	raw_spin_unlock(&tick_broadcast_lock);

}
@@ -263,13 +261,12 @@ static void tick_do_broadcast_on_off(unsigned long *reason) 
	if (!tick_device_is_functional(dev))

		goto out;



	bc_stopped = cpumask_empty(tick_get_broadcast_mask());

	bc_stopped = cpumask_empty(tick_broadcast_mask);



	switch (*reason) {

	case CLOCK_EVT_NOTIFY_BROADCAST_ON:

	case CLOCK_EVT_NOTIFY_BROADCAST_FORCE:

		if (!cpumask_test_cpu(cpu, tick_get_broadcast_mask())) {

			cpumask_set_cpu(cpu, tick_get_broadcast_mask());

		if (!cpumask_test_and_set_cpu(cpu, tick_broadcast_mask)) {

			if (tick_broadcast_device.mode ==

			    TICKDEV_MODE_PERIODIC)

				clockevents_shutdown(dev);
@@ -279,8 +276,7 @@ static void tick_do_broadcast_on_off(unsigned long *reason) 
		break;

	case CLOCK_EVT_NOTIFY_BROADCAST_OFF:

		if (!tick_broadcast_force &&

		    cpumask_test_cpu(cpu, tick_get_broadcast_mask())) {

			cpumask_clear_cpu(cpu, tick_get_broadcast_mask());

		    cpumask_test_and_clear_cpu(cpu, tick_broadcast_mask)) {

			if (tick_broadcast_device.mode ==

			    TICKDEV_MODE_PERIODIC)

				tick_setup_periodic(dev, 0);
@@ -288,7 +284,7 @@ static void tick_do_broadcast_on_off(unsigned long *reason) 
		break;

	}



	if (cpumask_empty(tick_get_broadcast_mask())) {

	if (cpumask_empty(tick_broadcast_mask)) {

		if (!bc_stopped)

			clockevents_shutdown(bc);

	} else if (bc_stopped) {
@@ -337,10 +333,10 @@ void tick_shutdown_broadcast(unsigned int *cpup) 
	raw_spin_lock_irqsave(&tick_broadcast_lock, flags);



	bc = tick_broadcast_device.evtdev;

	cpumask_clear_cpu(cpu, tick_get_broadcast_mask());

	cpumask_clear_cpu(cpu, tick_broadcast_mask);



	if (tick_broadcast_device.mode == TICKDEV_MODE_PERIODIC) {

		if (bc && cpumask_empty(tick_get_broadcast_mask()))

		if (bc && cpumask_empty(tick_broadcast_mask))

			clockevents_shutdown(bc);

	}
@@ -376,13 +372,13 @@ int tick_resume_broadcast(void) 


		switch (tick_broadcast_device.mode) {

		case TICKDEV_MODE_PERIODIC:

			if (!cpumask_empty(tick_get_broadcast_mask()))

			if (!cpumask_empty(tick_broadcast_mask))

				tick_broadcast_start_periodic(bc);

			broadcast = cpumask_test_cpu(smp_processor_id(),

						     tick_get_broadcast_mask());

						     tick_broadcast_mask);

			break;

		case TICKDEV_MODE_ONESHOT:

			if (!cpumask_empty(tick_get_broadcast_mask()))

			if (!cpumask_empty(tick_broadcast_mask))

				broadcast = tick_resume_broadcast_oneshot(bc);

			break;

		}
@@ -395,15 +391,14 @@ int tick_resume_broadcast(void) 


#ifdef CONFIG_TICK_ONESHOT



/* FIXME: use cpumask_var_t. */

static DECLARE_BITMAP(tick_broadcast_oneshot_mask, NR_CPUS);

static cpumask_var_t tick_broadcast_oneshot_mask;



/*

 * Exposed for debugging: see timer_list.c

 */

struct cpumask *tick_get_broadcast_oneshot_mask(void)

{

	return to_cpumask(tick_broadcast_oneshot_mask);

	return tick_broadcast_oneshot_mask;

}



static int tick_broadcast_set_event(ktime_t expires, int force)
@@ -428,7 +423,7 @@ int tick_resume_broadcast_oneshot(struct clock_event_device *bc) 
 */

void tick_check_oneshot_broadcast(int cpu)

{

	if (cpumask_test_cpu(cpu, to_cpumask(tick_broadcast_oneshot_mask))) {

	if (cpumask_test_cpu(cpu, tick_broadcast_oneshot_mask)) {

		struct tick_device *td = &per_cpu(tick_cpu_device, cpu);



		clockevents_set_mode(td->evtdev, CLOCK_EVT_MODE_ONESHOT);
@@ -448,13 +443,13 @@ static void tick_handle_oneshot_broadcast(struct clock_event_device *dev) 
again:

	dev->next_event.tv64 = KTIME_MAX;

	next_event.tv64 = KTIME_MAX;

	cpumask_clear(to_cpumask(tmpmask));

	cpumask_clear(tmpmask);

	now = ktime_get();

	/* Find all expired events */

	for_each_cpu(cpu, tick_get_broadcast_oneshot_mask()) {

	for_each_cpu(cpu, tick_broadcast_oneshot_mask) {

		td = &per_cpu(tick_cpu_device, cpu);

		if (td->evtdev->next_event.tv64 <= now.tv64)

			cpumask_set_cpu(cpu, to_cpumask(tmpmask));

			cpumask_set_cpu(cpu, tmpmask);

		else if (td->evtdev->next_event.tv64 < next_event.tv64)

			next_event.tv64 = td->evtdev->next_event.tv64;

	}
@@ -462,7 +457,7 @@ again: 
	/*

	 * Wakeup the cpus which have an expired event.

	 */

	tick_do_broadcast(to_cpumask(tmpmask));

	tick_do_broadcast(tmpmask);



	/*

	 * Two reasons for reprogram:
@@ -518,16 +513,13 @@ void tick_broadcast_oneshot_control(unsigned long reason) 


	raw_spin_lock_irqsave(&tick_broadcast_lock, flags);

	if (reason == CLOCK_EVT_NOTIFY_BROADCAST_ENTER) {

		if (!cpumask_test_cpu(cpu, tick_get_broadcast_oneshot_mask())) {

			cpumask_set_cpu(cpu, tick_get_broadcast_oneshot_mask());

		if (!cpumask_test_and_set_cpu(cpu, tick_broadcast_oneshot_mask)) {

			clockevents_set_mode(dev, CLOCK_EVT_MODE_SHUTDOWN);

			if (dev->next_event.tv64 < bc->next_event.tv64)

				tick_broadcast_set_event(dev->next_event, 1);

		}

	} else {

		if (cpumask_test_cpu(cpu, tick_get_broadcast_oneshot_mask())) {

			cpumask_clear_cpu(cpu,

					  tick_get_broadcast_oneshot_mask());

		if (cpumask_test_and_clear_cpu(cpu, tick_broadcast_oneshot_mask)) {

			clockevents_set_mode(dev, CLOCK_EVT_MODE_ONESHOT);

			if (dev->next_event.tv64 != KTIME_MAX)

				tick_program_event(dev->next_event, 1);
@@ -543,7 +535,7 @@ void tick_broadcast_oneshot_control(unsigned long reason) 
 */

static void tick_broadcast_clear_oneshot(int cpu)

{

	cpumask_clear_cpu(cpu, tick_get_broadcast_oneshot_mask());

	cpumask_clear_cpu(cpu, tick_broadcast_oneshot_mask);

}



static void tick_broadcast_init_next_event(struct cpumask *mask,
@@ -581,15 +573,14 @@ void tick_broadcast_setup_oneshot(struct clock_event_device *bc) 
		 * oneshot_mask bits for those and program the

		 * broadcast device to fire.

		 */

		cpumask_copy(to_cpumask(tmpmask), tick_get_broadcast_mask());

		cpumask_clear_cpu(cpu, to_cpumask(tmpmask));

		cpumask_or(tick_get_broadcast_oneshot_mask(),

			   tick_get_broadcast_oneshot_mask(),

			   to_cpumask(tmpmask));

		cpumask_copy(tmpmask, tick_broadcast_mask);

		cpumask_clear_cpu(cpu, tmpmask);

		cpumask_or(tick_broadcast_oneshot_mask,

			   tick_broadcast_oneshot_mask, tmpmask);



		if (was_periodic && !cpumask_empty(to_cpumask(tmpmask))) {

		if (was_periodic && !cpumask_empty(tmpmask)) {

			clockevents_set_mode(bc, CLOCK_EVT_MODE_ONESHOT);

			tick_broadcast_init_next_event(to_cpumask(tmpmask),

			tick_broadcast_init_next_event(tmpmask,

						       tick_next_period);

			tick_broadcast_set_event(tick_next_period, 1);

		} else
@@ -639,7 +630,7 @@ void tick_shutdown_broadcast_oneshot(unsigned int *cpup) 
	 * Clear the broadcast mask flag for the dead cpu, but do not

	 * stop the broadcast device!

	 */

	cpumask_clear_cpu(cpu, tick_get_broadcast_oneshot_mask());

	cpumask_clear_cpu(cpu, tick_broadcast_oneshot_mask);



	raw_spin_unlock_irqrestore(&tick_broadcast_lock, flags);

}
@@ -663,3 +654,12 @@ bool tick_broadcast_oneshot_available(void) 
}



#endif



void __init tick_broadcast_init(void)

{

	alloc_cpumask_var(&tick_broadcast_mask, GFP_NOWAIT);

	alloc_cpumask_var(&tmpmask, GFP_NOWAIT);

#ifdef CONFIG_TICK_ONESHOT

	alloc_cpumask_var(&tick_broadcast_oneshot_mask, GFP_NOWAIT);

#endif

}

kernel/time/tick-common.c

+1 −0
Original line number Diff line number Diff line
@@ -416,4 +416,5 @@ static struct notifier_block tick_notifier = { 
void __init tick_init(void)

{

	clockevents_register_notifier(&tick_notifier);

	tick_broadcast_init();

}

kernel/time/tick-internal.h

+2 −1
Original line number Diff line number Diff line
@@ -94,7 +94,7 @@ extern void tick_broadcast_on_off(unsigned long reason, int *oncpu); 
extern void tick_shutdown_broadcast(unsigned int *cpup);

extern void tick_suspend_broadcast(void);

extern int tick_resume_broadcast(void);



extern void tick_broadcast_init(void);

extern void

tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
@@ -119,6 +119,7 @@ static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { } 
static inline void tick_shutdown_broadcast(unsigned int *cpup) { }

static inline void tick_suspend_broadcast(void) { }

static inline int tick_resume_broadcast(void) { return 0; }

static inline void tick_broadcast_init(void) { }



/*

 * Set the periodic handler in non broadcast mode