/*
 * Switch to high resolution mode
 */
static int hrtimer_switch_to_hres(void)
{
	int i, cpu = smp_processor_id();
	struct hrtimer_cpu_base *base = &per_cpu(hrtimer_bases, cpu);
	unsigned long flags;

	if (base->hres_active)
		return 1;

	local_irq_save(flags);

	if (tick_init_highres()) {
		local_irq_restore(flags);
		printk(KERN_WARNING "Could not switch to high resolution "
				    "mode on CPU %d\n", cpu);
		return 0;
	}
	base->hres_active = 1;
	for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++)
		base->clock_base[i].resolution = KTIME_HIGH_RES;

	tick_setup_sched_timer();
	/* "Retrigger" the interrupt to get things going */
	retrigger_next_event(NULL);
	local_irq_restore(flags);
	return 1;
}

/*
 * During resume we might have to reprogram the high resolution timer
 * interrupt (on the local CPU):
 */
void hres_timers_resume(void)
{
	WARN_ONCE(!irqs_disabled(),
		  KERN_INFO "hres_timers_resume() called with IRQs enabled!");

	retrigger_next_event(NULL);
}

/*
 * During resume we might have to reprogram the high resolution timer
 * interrupt (on the local CPU):
 */
void hres_timers_resume(void)
{
	WARN_ON_ONCE(num_online_cpus() > 1);

	/* Retrigger the CPU local events: */
	retrigger_next_event(NULL);
}

/*
 * Switch to high resolution mode
 */
static int hrtimer_switch_to_hres(void)
{
	struct hrtimer_cpu_base *base = &__get_cpu_var(hrtimer_bases);
	unsigned long flags;

	if (base->hres_active)
		return 1;

	local_irq_save(flags);

	if (tick_init_highres()) {
		local_irq_restore(flags);
		return 0;
	}
	base->hres_active = 1;
	base->clock_base[CLOCK_REALTIME].resolution = KTIME_HIGH_RES;
	base->clock_base[CLOCK_MONOTONIC].resolution = KTIME_HIGH_RES;

	tick_setup_sched_timer();

	/* "Retrigger" the interrupt to get things going */
	retrigger_next_event(NULL);
	local_irq_restore(flags);
	printk(KERN_INFO "Switched to high resolution mode on CPU %d\n",
	       smp_processor_id());
	return 1;
}

/*
 * During resume we might have to reprogram the high resolution timer
 * interrupt (on the local CPU):
 */
void hrtimers_resume(void)
{
	WARN_ONCE(!irqs_disabled(),
		  KERN_INFO "hrtimers_resume() called with IRQs enabled!");

	/* Retrigger on the local CPU */
	retrigger_next_event(NULL);
	/* And schedule a retrigger for all others */
	clock_was_set_delayed();
}

/*
 * Switch to high resolution mode
 */
static void hrtimer_switch_to_hres(void)
{
	struct hrtimer_cpu_base *base = this_cpu_ptr(&hrtimer_bases);

	if (tick_init_highres()) {
		printk(KERN_WARNING "Could not switch to high resolution "
				    "mode on CPU %d\n", base->cpu);
		return;
	}
	base->hres_active = 1;
	hrtimer_resolution = HIGH_RES_NSEC;

	tick_setup_sched_timer();
	/* "Retrigger" the interrupt to get things going */
	retrigger_next_event(NULL);
}

/*
 * During resume we might have to reprogram the high resolution timer
 * interrupt (on the local CPU):
 */
void hres_timers_resume(void)
{
	/* Retrigger the CPU local events: */
	retrigger_next_event(NULL);
}