int __cpuinit cpu_up(unsigned int cpu)
{
int err = 0;
#ifdef CONFIG_MEMORY_HOTPLUG
int nid;
pg_data_t *pgdat;
#endif
trace_cpu_hotplug(cpu, POWER_CPU_UP_START);
if (!cpu_possible(cpu)) {
printk(KERN_ERR "can't online cpu %d because it is not "
"configured as may-hotadd at boot time\n", cpu);
#if defined(CONFIG_IA64)
printk(KERN_ERR "please check additional_cpus= boot "
"parameter\n");
#endif
return -EINVAL;
}
#ifdef CONFIG_MEMORY_HOTPLUG
nid = cpu_to_node(cpu);
if (!node_online(nid)) {
err = mem_online_node(nid);
if (err)
return err;
}
pgdat = NODE_DATA(nid);
if (!pgdat) {
printk(KERN_ERR
"Can't online cpu %d due to NULL pgdat\n", cpu);
return -ENOMEM;
}
if (pgdat->node_zonelists->_zonerefs->zone == NULL) {
mutex_lock(&zonelists_mutex);
build_all_zonelists(NULL);
mutex_unlock(&zonelists_mutex);
}
#endif
cpu_maps_update_begin();
if (cpu_hotplug_disabled) {
err = -EBUSY;
goto out;
}
err = _cpu_up(cpu, 0);
out:
cpu_maps_update_done();
trace_cpu_hotplug(cpu, POWER_CPU_UP_DONE);
return err;
}
/*
* platform_cpu_die: shutdown a CPU
* @cpu:
*/
void platform_cpu_die(unsigned int cpu)
{
int spurious = 0;
struct wd_api *wd_api = NULL;
HOTPLUG_INFO("platform_cpu_die, cpu: %d\n", cpu);
get_wd_api(&wd_api);
if (wd_api)
wd_api->wd_cpu_hot_plug_off_notify(cpu);
#ifdef CONFIG_MTK_SCHED_TRACERS
trace_cpu_hotplug(cpu, 0, per_cpu(last_event_ts, cpu));
per_cpu(last_event_ts, cpu) = ns2usecs(ftrace_now(cpu));
#endif
/*
* we're ready for shutdown now, so do it
*/
cpu_enter_lowpower(cpu);
platform_do_lowpower(cpu, &spurious);
/*
* bring this CPU back into the world of cache
* coherency, and then restore interrupts
*/
cpu_leave_lowpower(cpu);
if (spurious)
HOTPLUG_INFO("platform_do_lowpower, spurious wakeup call, cpu: %d, spurious: %d\n", cpu, spurious);
}
int __ref cpu_down(unsigned int cpu)
{
int err;
trace_cpu_hotplug(cpu, POWER_CPU_DOWN_START);
cpu_maps_update_begin();
if (cpu_hotplug_disabled) {
err = -EBUSY;
goto out;
}
err = _cpu_down(cpu, 0);
out:
cpu_maps_update_done();
trace_cpu_hotplug(cpu, POWER_CPU_DOWN_DONE);
return err;
}
