C++ register_cpu_notifier函数代码示例

static ssize_t __ref store_cc_enabled(struct kobject *kobj,
		struct kobj_attribute *attr, const char *buf, size_t count)
{
	int ret = 0;
	int val = 0;

	mutex_lock(&core_control_mutex);
	ret = kstrtoint(buf, 10, &val);
	if (ret) {
		pr_err("%s: Invalid input %s\n", KBUILD_MODNAME, buf);
		goto done_store_cc;
	}

	if (core_control_enabled == !!val)
		goto done_store_cc;

	core_control_enabled = !!val;
	if (core_control_enabled) {
		pr_info("%s: Core control enabled\n", KBUILD_MODNAME);
		register_cpu_notifier(&msm_thermal_cpu_notifier);
		update_offline_cores(cpus_offlined);
	} else {
		pr_info("%s: Core control disabled\n", KBUILD_MODNAME);
		unregister_cpu_notifier(&msm_thermal_cpu_notifier);
	}

done_store_cc:
	mutex_unlock(&core_control_mutex);
	return count;
}

int __devinit msm_thermal_init(struct msm_thermal_data *pdata)
{
	int ret = 0;

	BUG_ON(!pdata);
	tsens_get_max_sensor_num(&max_tsens_num);
	memcpy(&msm_thermal_info, pdata, sizeof(struct msm_thermal_data));

	if (create_sensor_id_map())
		return -EINVAL;
	if (check_sensor_id(msm_thermal_info.sensor_id))
		return -EINVAL;

	enabled = 1;
	INIT_DELAYED_WORK(&check_temp_work, check_temp);
	schedule_delayed_work(&check_temp_work, 0);

	if (num_possible_cpus() > 1) {
		mutex_lock(&core_control_mutex);
		core_control_enabled = 1;
		register_cpu_notifier(&msm_thermal_cpu_notifier);
		update_offline_cores(cpus_offlined);
		mutex_unlock(&core_control_mutex);
	}

	return ret;
}

int kvm_init_srcu(void)
{
	struct task_struct *p;
	int cpu;
	int err;

	get_online_cpus();
	for_each_online_cpu(cpu) {
		p = kthread_create(kvm_rcu_sync_thread, (void *)(long)cpu,
				   "kvmsrcusync/%d", cpu);
		if (IS_ERR(p))
			goto error_out;

		kthread_bind(p, cpu);
		sched_setscheduler(p, SCHED_FIFO, &sync_thread_param);
		per_cpu(sync_thread, cpu) = p;
		wake_up_process(p);
	}
#ifdef CONFIG_HOTPLUG_CPU
	register_cpu_notifier(&cpu_nfb);
#endif /* CONFIG_HOTPLUG_CPU */
	put_online_cpus();

	return 0;

error_out:
	put_online_cpus();
	printk(KERN_ERR "kvm: kvmsrcsync for %d failed\n", cpu);
	err = PTR_ERR(p);
	kvm_exit_srcu();
	return err;
}

static int __init topology_init(void)
{
	int cpu;

	register_nodes();
	register_cpu_notifier(&sysfs_cpu_nb);

	for_each_possible_cpu(cpu) {
		struct cpu *c = &per_cpu(cpu_devices, cpu);

		/*
		 * For now, we just see if the system supports making
		 * the RTAS calls for CPU hotplug.  But, there may be a
		 * more comprehensive way to do this for an individual
		 * CPU.  For instance, the boot cpu might never be valid
		 * for hotplugging.
		 */
		if (ppc_md.cpu_die)
			c->hotpluggable = 1;

		if (cpu_online(cpu) || c->hotpluggable) {
			register_cpu(c, cpu);

			device_create_file(&c->dev, &dev_attr_physical_id);
		}

		if (cpu_online(cpu))
			register_cpu_online(cpu);
	}
#ifdef CONFIG_PPC64
	sysfs_create_dscr_default();
#endif /* CONFIG_PPC64 */

	return 0;
}

/*
 * One-time initialisation.
 */
static int __init arch_hw_breakpoint_init(void)
{
	core_num_brps = get_num_brps();
	core_num_wrps = get_num_wrps();

	pr_info("found %d breakpoint and %d watchpoint registers.\n",
		core_num_brps, core_num_wrps);

	/*
	 * Reset the breakpoint resources. We assume that a halting
	 * debugger will leave the world in a nice state for us.
	 */
	smp_call_function(reset_ctrl_regs, NULL, 1);
	reset_ctrl_regs(NULL);

	/* Register debug fault handlers. */
	hook_debug_fault_code(DBG_ESR_EVT_HWBP, breakpoint_handler, SIGTRAP,
			      TRAP_HWBKPT, "hw-breakpoint handler");
	hook_debug_fault_code(DBG_ESR_EVT_HWWP, watchpoint_handler, SIGTRAP,
			      TRAP_HWBKPT, "hw-watchpoint handler");

	/* Register hotplug notifier. */
	register_cpu_notifier(&hw_breakpoint_reset_nb);

	return 0;
}

static __init int irq_work_init_cpu_notifier(void)
{
	cpu_notify.notifier_call = irq_work_cpu_notify;
	cpu_notify.priority = 0;
	register_cpu_notifier(&cpu_notify);
	return 0;
}

static ssize_t __ref store_cc_enabled(struct kobject *kobj,
		struct kobj_attribute *attr, const char *buf, size_t count)
{
	int ret = 0;
	int val = 0;

	ret = kstrtoint(buf, 10, &val);
	if (ret) {
		pr_err("%s: Invalid input %s\n", KBUILD_MODNAME, buf);
		goto done_store_cc;
	}

	if (core_control_enabled == !!val)
		goto done_store_cc;

	core_control_enabled = !!val;
	if (core_control_enabled) {
		pr_info("%s: Core control enabled\n", KBUILD_MODNAME);
		register_cpu_notifier(&msm_thermal_cpu_notifier);
		if (hotplug_task)
			complete(&hotplug_notify_complete);
		else
			pr_err("%s: Hotplug task is not initialized\n",
					KBUILD_MODNAME);
	} else {
		pr_info("%s: Core control disabled\n", KBUILD_MODNAME);
		unregister_cpu_notifier(&msm_thermal_cpu_notifier);
	}

done_store_cc:
	return count;
}

int __init metag_generic_timer_init(void)
{
	/*
	 * On Meta 2 SoCs, the actual frequency of the timer is based on the
	 * Meta core clock speed divided by an integer, so it is only
	 * approximately 1MHz. Calculating the real frequency here drastically
	 * reduces clock skew on these SoCs.
	 */
#ifdef CONFIG_METAG_META21
	hwtimer_freq = get_coreclock() / (metag_in32(EXPAND_TIMER_DIV) + 1);
#endif
	pr_info("Timer frequency: %u Hz\n", hwtimer_freq);

	clocksource_register_hz(&clocksource_metag, hwtimer_freq);

	setup_irq(tbisig_map(TBID_SIGNUM_TRT), &metag_timer_irq);

	/* Configure timer on boot CPU */
	arch_timer_setup(smp_processor_id());

	/* Hook cpu boot to configure other CPU's timers */
	register_cpu_notifier(&arch_timer_cpu_nb);

	return 0;
}

static int __init pseries_processor_idle_init(void)
{
	int retval;

	retval = pseries_idle_probe();
	if (retval)
		return retval;

	pseries_cpuidle_driver_init();
	retval = cpuidle_register_driver(&pseries_idle_driver);
	if (retval) {
		printk(KERN_DEBUG "Registration of pseries driver failed.\n");
		return retval;
	}

	retval = pseries_idle_devices_init();
	if (retval) {
		pseries_idle_devices_uninit();
		cpuidle_unregister_driver(&pseries_idle_driver);
		return retval;
	}

	register_cpu_notifier(&setup_hotplug_notifier);
	printk(KERN_DEBUG "pseries_idle_driver registered\n");

	return 0;
}

static int __cpuinit setup_cpu_watcher(struct notifier_block *notifier,
				       unsigned long event, void *data)
{
	unsigned int i;

	static struct xenbus_watch __cpuinitdata cpu_watch = {
		.node = "cpu",
		.callback = handle_vcpu_hotplug_event,
		.flags = XBWF_new_thread };
	(void)register_xenbus_watch(&cpu_watch);

	if (!is_initial_xendomain()) {
		for_each_possible_cpu(i)
			vcpu_hotplug(i);
		printk(KERN_INFO "Brought up %ld CPUs\n",
		       (long)num_online_cpus());
	}

	return NOTIFY_DONE;
}

static int __init setup_vcpu_hotplug_event(void)
{
	static struct notifier_block hotplug_cpu = {
		.notifier_call = smpboot_cpu_notify };
	static struct notifier_block __cpuinitdata xsn_cpu = {
		.notifier_call = setup_cpu_watcher };

	if (!is_running_on_xen())
		return -ENODEV;

	register_cpu_notifier(&hotplug_cpu);
	register_xenstore_notifier(&xsn_cpu);

	return 0;
}

arch_initcall(setup_vcpu_hotplug_event);

int __ref smp_suspend(void)
{
	unsigned int cpu;
	int err;

	for_each_online_cpu(cpu) {
		if (cpu == 0)
			continue;
		err = cpu_down(cpu);
		if (err) {
			printk(KERN_CRIT "Failed to take all CPUs "
			       "down: %d.\n", err);
			for_each_possible_cpu(cpu)
				vcpu_hotplug(cpu);
			return err;
		}
	}

	return 0;
}

__init int spawn_ksoftirqd(void)
{
	void *cpu = (void *)(long)smp_processor_id();
	cpu_callback(&cpu_nfb, CPU_UP_PREPARE, cpu);
	cpu_callback(&cpu_nfb, CPU_ONLINE, cpu);
	register_cpu_notifier(&cpu_nfb);
	return 0;
}

void __init tasklet_subsys_init(void)
{
    void *hcpu = (void *)(long)smp_processor_id();
    cpu_callback(&cpu_nfb, CPU_UP_PREPARE, hcpu);
    register_cpu_notifier(&cpu_nfb);
    open_softirq(TASKLET_SOFTIRQ, tasklet_softirq_action);
    tasklets_initialised = 1;
}

static int __init test_init(void)
{
	//enable_clock(12, "Vfifo");
	
	register_cpu_notifier(&cpu_nfb);
	start_kicker();
	return 0;
}

static __init int spawn_ksoftirqd(void)
{
	register_cpu_notifier(&cpu_nfb);

	BUG_ON(smpboot_register_percpu_thread(&softirq_threads));

	return 0;
}

void __init hrtimers_init(void)
{
	hrtimer_cpu_notify(&hrtimers_nb, (unsigned long)CPU_UP_PREPARE,
			  (void *)(long)smp_processor_id());
	register_cpu_notifier(&hrtimers_nb);
#ifdef CONFIG_HIGH_RES_TIMERS
	open_softirq(HRTIMER_SOFTIRQ, run_hrtimer_softirq);
#endif
}