Release 4.7 include/linux/smpboot.h

#ifndef _LINUX_SMPBOOT_H

#define _LINUX_SMPBOOT_H

#include <linux/types.h>

struct task_struct;
/* Cookie handed to the thread_fn*/
struct smpboot_thread_data;

/**
 * struct smp_hotplug_thread - CPU hotplug related thread descriptor
 * @store:              Pointer to per cpu storage for the task pointers
 * @list:               List head for core management
 * @thread_should_run:  Check whether the thread should run or not. Called with
 *                      preemption disabled.
 * @thread_fn:          The associated thread function
 * @create:             Optional setup function, called when the thread gets
 *                      created (Not called from the thread context)
 * @setup:              Optional setup function, called when the thread gets
 *                      operational the first time
 * @cleanup:            Optional cleanup function, called when the thread
 *                      should stop (module exit)
 * @park:               Optional park function, called when the thread is
 *                      parked (cpu offline)
 * @unpark:             Optional unpark function, called when the thread is
 *                      unparked (cpu online)
 * @cpumask:            Internal state.  To update which threads are unparked,
 *                      call smpboot_update_cpumask_percpu_thread().
 * @selfparking:        Thread is not parked by the park function.
 * @thread_comm:        The base name of the thread
 */

struct smp_hotplug_thread {
	
struct task_struct __percpu	**store;
	
struct list_head		list;
	
int				(*thread_should_run)(unsigned int cpu);
	
void				(*thread_fn)(unsigned int cpu);
	
void				(*create)(unsigned int cpu);
	
void				(*setup)(unsigned int cpu);
	
void				(*cleanup)(unsigned int cpu, bool online);
	
void				(*park)(unsigned int cpu);
	
void				(*unpark)(unsigned int cpu);
	
cpumask_var_t			cpumask;
	
bool				selfparking;
	
const char			*thread_comm;
};

int smpboot_register_percpu_thread_cpumask(struct smp_hotplug_thread *plug_thread,
					   const struct cpumask *cpumask);


static inline int

smpboot_register_percpu_thread(struct smp_hotplug_thread *plug_thread)
{
	return smpboot_register_percpu_thread_cpumask(plug_thread,
						      cpu_possible_mask);
}

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void smpboot_unregister_percpu_thread(struct smp_hotplug_thread *plug_thread);
int smpboot_update_cpumask_percpu_thread(struct smp_hotplug_thread *plug_thread,
					 const struct cpumask *);

#endif
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