hrtimer: simplify hotplug migration

#ifdef CONFIG_HOTPLUG_CPU

static void tickle_timers(void *arg)

{

	hrtimer_peek_ahead_timers();

}

static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base,

				struct hrtimer_clock_base *new_base)

{

static void migrate_hrtimers(int scpu)

{

	struct hrtimer_cpu_base *old_base, *new_base;

	int dcpu, i;

	int i;

	BUG_ON(cpu_online(scpu));

	old_base = &per_cpu(hrtimer_bases, scpu);

	new_base = &get_cpu_var(hrtimer_bases);

	dcpu = smp_processor_id();

	tick_cancel_sched_timer(scpu);

	local_irq_disable();

	old_base = &per_cpu(hrtimer_bases, scpu);

	new_base = &__get_cpu_var(hrtimer_bases);

	/*

	 * The caller is globally serialized and nobody else

	 * takes two locks at once, deadlock is not possible.

	 */

	spin_lock_irq(&new_base->lock);

	spin_lock(&new_base->lock);

	spin_lock_nested(&old_base->lock, SINGLE_DEPTH_NESTING);

	for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {

	}

	spin_unlock(&old_base->lock);

	spin_unlock_irq(&new_base->lock);

	put_cpu_var(hrtimer_bases);

	spin_unlock(&new_base->lock);

	smp_call_function_single(dcpu, tickle_timers, NULL, 0);

	/* Check, if we got expired work to do */

	__hrtimer_peek_ahead_timers();

	local_irq_enable();

}

#endif /* CONFIG_HOTPLUG_CPU */