1. 根目录:
2. arch
3. powerpc
4. platforms
5. pseries
6. offline_states.h

#ifndef _OFFLINE_STATES_H_
#define _OFFLINE_STATES_H_

/* Cpu offline states go here */
enum cpu_state_vals {
	CPU_STATE_OFFLINE,
	CPU_STATE_INACTIVE,
	CPU_STATE_ONLINE,
	CPU_MAX_OFFLINE_STATES
};

#ifdef CONFIG_HOTPLUG_CPU
extern enum cpu_state_vals get_cpu_current_state(int cpu);
extern void set_cpu_current_state(int cpu, enum cpu_state_vals state);
extern void set_preferred_offline_state(int cpu, enum cpu_state_vals state);
extern void set_default_offline_state(int cpu);
#else
static inline enum cpu_state_vals get_cpu_current_state(int cpu)
{
	return CPU_STATE_ONLINE;
}

static inline void set_cpu_current_state(int cpu, enum cpu_state_vals state)
{
}

static inline void set_preferred_offline_state(int cpu, enum cpu_state_vals state)
{
}

static inline void set_default_offline_state(int cpu)
{
}
#endif

extern enum cpu_state_vals get_preferred_offline_state(int cpu);
#endif