root/include/linux/cpu.h

INCLUDED FROM

DEFINITIONS

1. register_cpu_notifier
2. unregister_cpu_notifier
3. register_cpu_notifier
4. unregister_cpu_notifier
5. cpu_hotplug_init
6. cpu_maps_update_begin
7. cpu_maps_update_done
8. cpuhotplug_mutex_lock
9. cpuhotplug_mutex_unlock
10. cpuhotplug_mutex_lock
11. cpuhotplug_mutex_unlock
12. disable_nonboot_cpus
13. enable_nonboot_cpus

/*
 * include/linux/cpu.h - generic cpu definition
 *
 * This is mainly for topological representation. We define the 
 * basic 'struct cpu' here, which can be embedded in per-arch 
 * definitions of processors.
 *
 * Basic handling of the devices is done in drivers/base/cpu.c
 * and system devices are handled in drivers/base/sys.c. 
 *
 * CPUs are exported via sysfs in the class/cpu/devices/
 * directory. 
 *
 * Per-cpu interfaces can be implemented using a struct device_interface. 
 * See the following for how to do this: 
 * - drivers/base/intf.c 
 * - Documentation/driver-model/interface.txt
 */
#ifndef _LINUX_CPU_H_
#define _LINUX_CPU_H_

#include <linux/sysdev.h>
#include <linux/node.h>
#include <linux/compiler.h>
#include <linux/cpumask.h>
#include <linux/mutex.h>

struct cpu {
        int node_id;            /* The node which contains the CPU */
        int hotpluggable;       /* creates sysfs control file if hotpluggable */
        struct sys_device sysdev;
};

extern int register_cpu(struct cpu *cpu, int num);
extern struct sys_device *get_cpu_sysdev(unsigned cpu);

extern int cpu_add_sysdev_attr(struct sysdev_attribute *attr);
extern void cpu_remove_sysdev_attr(struct sysdev_attribute *attr);

extern int cpu_add_sysdev_attr_group(struct attribute_group *attrs);
extern void cpu_remove_sysdev_attr_group(struct attribute_group *attrs);

extern int sched_create_sysfs_power_savings_entries(struct sysdev_class *cls);

#ifdef CONFIG_HOTPLUG_CPU
extern void unregister_cpu(struct cpu *cpu);
#endif
struct notifier_block;

#ifdef CONFIG_SMP
/* Need to know about CPUs going up/down? */
#ifdef CONFIG_HOTPLUG_CPU
extern int register_cpu_notifier(struct notifier_block *nb);
extern void unregister_cpu_notifier(struct notifier_block *nb);
#else

#ifndef MODULE
extern int register_cpu_notifier(struct notifier_block *nb);
#else
static inline int register_cpu_notifier(struct notifier_block *nb)
{
        return 0;
}
#endif

static inline void unregister_cpu_notifier(struct notifier_block *nb)
{
}
#endif

int cpu_up(unsigned int cpu);
void notify_cpu_starting(unsigned int cpu);
extern void cpu_hotplug_init(void);
extern void cpu_maps_update_begin(void);
extern void cpu_maps_update_done(void);

#else   /* CONFIG_SMP */

static inline int register_cpu_notifier(struct notifier_block *nb)
{
        return 0;
}

static inline void unregister_cpu_notifier(struct notifier_block *nb)
{
}

static inline void cpu_hotplug_init(void)
{
}

static inline void cpu_maps_update_begin(void)
{
}

static inline void cpu_maps_update_done(void)
{
}

#endif /* CONFIG_SMP */
extern struct sysdev_class cpu_sysdev_class;

#ifdef CONFIG_HOTPLUG_CPU
/* Stop CPUs going up and down. */

static inline void cpuhotplug_mutex_lock(struct mutex *cpu_hp_mutex)
{
        mutex_lock(cpu_hp_mutex);
}

static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex)
{
        mutex_unlock(cpu_hp_mutex);
}

extern void get_online_cpus(void);
extern void put_online_cpus(void);
#define hotcpu_notifier(fn, pri) {                              \
        static struct notifier_block fn##_nb __cpuinitdata =    \
                { .notifier_call = fn, .priority = pri };       \
        register_cpu_notifier(&fn##_nb);                        \
}
#define register_hotcpu_notifier(nb)    register_cpu_notifier(nb)
#define unregister_hotcpu_notifier(nb)  unregister_cpu_notifier(nb)
int cpu_down(unsigned int cpu);

#else           /* CONFIG_HOTPLUG_CPU */

static inline void cpuhotplug_mutex_lock(struct mutex *cpu_hp_mutex)
{ }
static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex)
{ }

#define get_online_cpus()       do { } while (0)
#define put_online_cpus()       do { } while (0)
#define hotcpu_notifier(fn, pri)        do { (void)(fn); } while (0)
/* These aren't inline functions due to a GCC bug. */
#define register_hotcpu_notifier(nb)    ({ (void)(nb); 0; })
#define unregister_hotcpu_notifier(nb)  ({ (void)(nb); })
#endif          /* CONFIG_HOTPLUG_CPU */

#ifdef CONFIG_PM_SLEEP_SMP
extern int suspend_cpu_hotplug;

extern int disable_nonboot_cpus(void);
extern void enable_nonboot_cpus(void);
#else /* !CONFIG_PM_SLEEP_SMP */
#define suspend_cpu_hotplug     0

static inline int disable_nonboot_cpus(void) { return 0; }
static inline void enable_nonboot_cpus(void) {}
#endif /* !CONFIG_PM_SLEEP_SMP */

#endif /* _LINUX_CPU_H_ */