#ifndef _LINUX_CPUSET_H
  #define _LINUX_CPUSET_H
  /*
   *  cpuset interface
   *
   *  Copyright (C) 2003 BULL SA

   *  Copyright (C) 2004-2006 Silicon Graphics, Inc.

   *
   */
  
  #include <linux/sched.h>
  #include <linux/cpumask.h>
  #include <linux/nodemask.h>

  #include <linux/mm.h>

  #include <linux/jump_label.h>

  
  #ifdef CONFIG_CPUSETS

  extern struct static_key cpusets_enabled_key;
  static inline bool cpusets_enabled(void)
  {
  	return static_key_false(&cpusets_enabled_key);
  }
  
  static inline int nr_cpusets(void)
  {
  	/* jump label reference count + the top-level cpuset */
  	return static_key_count(&cpusets_enabled_key) + 1;
  }
  
  static inline void cpuset_inc(void)
  {
  	static_key_slow_inc(&cpusets_enabled_key);
  }
  
  static inline void cpuset_dec(void)
  {
  	static_key_slow_dec(&cpusets_enabled_key);
  }

  extern int cpuset_init(void);
  extern void cpuset_init_smp(void);

  extern void cpuset_update_active_cpus(bool cpu_online);

  extern void cpuset_cpus_allowed(struct task_struct *p, struct cpumask *mask);

  extern void cpuset_cpus_allowed_fallback(struct task_struct *p);

  extern nodemask_t cpuset_mems_allowed(struct task_struct *p);

  #define cpuset_current_mems_allowed (current->mems_allowed)

  void cpuset_init_current_mems_allowed(void);

  int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask);

  extern int __cpuset_node_allowed(int node, gfp_t gfp_mask);

  static inline int cpuset_node_allowed(int node, gfp_t gfp_mask)

  {

  	return nr_cpusets() <= 1 || __cpuset_node_allowed(node, gfp_mask);

  }

  static inline int cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask)

  {

  	return cpuset_node_allowed(zone_to_nid(z), gfp_mask);

  }

  extern int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
  					  const struct task_struct *tsk2);

  
  #define cpuset_memory_pressure_bump() 				\
  	do {							\
  		if (cpuset_memory_pressure_enabled)		\
  			__cpuset_memory_pressure_bump();	\
  	} while (0)
  extern int cpuset_memory_pressure_enabled;
  extern void __cpuset_memory_pressure_bump(void);

  extern void cpuset_task_status_allowed(struct seq_file *m,
  					struct task_struct *task);

  extern int proc_cpuset_show(struct seq_file *m, struct pid_namespace *ns,
  			    struct pid *pid, struct task_struct *tsk);

  extern int cpuset_mem_spread_node(void);

  extern int cpuset_slab_spread_node(void);

  
  static inline int cpuset_do_page_mem_spread(void)
  {

  	return task_spread_page(current);

  }
  
  static inline int cpuset_do_slab_mem_spread(void)
  {

  	return task_spread_slab(current);

  }

  extern int current_cpuset_is_being_rebound(void);

  extern void rebuild_sched_domains(void);

  extern void cpuset_print_current_mems_allowed(void);

  /*

   * read_mems_allowed_begin is required when making decisions involving
   * mems_allowed such as during page allocation. mems_allowed can be updated in
   * parallel and depending on the new value an operation can fail potentially
   * causing process failure. A retry loop with read_mems_allowed_begin and
   * read_mems_allowed_retry prevents these artificial failures.

   */

  static inline unsigned int read_mems_allowed_begin(void)

  {

  	if (!cpusets_enabled())
  		return 0;

  	return read_seqcount_begin(&current->mems_allowed_seq);

  }

  /*

   * If this returns true, the operation that took place after
   * read_mems_allowed_begin may have failed artificially due to a concurrent
   * update of mems_allowed. It is up to the caller to retry the operation if

   * appropriate.
   */

  static inline bool read_mems_allowed_retry(unsigned int seq)

  {

  	if (!cpusets_enabled())
  		return false;

  	return read_seqcount_retry(&current->mems_allowed_seq, seq);

  }

  static inline void set_mems_allowed(nodemask_t nodemask)
  {

  	unsigned long flags;

  	task_lock(current);

  	local_irq_save(flags);

  	write_seqcount_begin(&current->mems_allowed_seq);

  	current->mems_allowed = nodemask;

  	write_seqcount_end(&current->mems_allowed_seq);

  	local_irq_restore(flags);

  	task_unlock(current);

  }

  #else /* !CONFIG_CPUSETS */

  static inline bool cpusets_enabled(void) { return false; }

  static inline int cpuset_init(void) { return 0; }
  static inline void cpuset_init_smp(void) {}

  static inline void cpuset_update_active_cpus(bool cpu_online)

  {
  	partition_sched_domains(1, NULL, NULL);
  }

  static inline void cpuset_cpus_allowed(struct task_struct *p,
  				       struct cpumask *mask)

  {

  	cpumask_copy(mask, cpu_possible_mask);

  }

  static inline void cpuset_cpus_allowed_fallback(struct task_struct *p)

  {

  }

  static inline nodemask_t cpuset_mems_allowed(struct task_struct *p)
  {
  	return node_possible_map;
  }

  #define cpuset_current_mems_allowed (node_states[N_MEMORY])

  static inline void cpuset_init_current_mems_allowed(void) {}

  static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask)

  {
  	return 1;
  }

  static inline int cpuset_node_allowed(int node, gfp_t gfp_mask)

  {
  	return 1;
  }

  static inline int cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask)

  {
  	return 1;
  }

  static inline int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
  						 const struct task_struct *tsk2)

  {
  	return 1;
  }

  static inline void cpuset_memory_pressure_bump(void) {}

  static inline void cpuset_task_status_allowed(struct seq_file *m,
  						struct task_struct *task)

  {

  }

  static inline int cpuset_mem_spread_node(void)
  {
  	return 0;
  }

  static inline int cpuset_slab_spread_node(void)
  {
  	return 0;
  }

  static inline int cpuset_do_page_mem_spread(void)
  {
  	return 0;
  }
  
  static inline int cpuset_do_slab_mem_spread(void)
  {
  	return 0;
  }

  static inline int current_cpuset_is_being_rebound(void)
  {
  	return 0;
  }

  static inline void rebuild_sched_domains(void)
  {

  	partition_sched_domains(1, NULL, NULL);

  }

  static inline void cpuset_print_current_mems_allowed(void)

  {
  }

  static inline void set_mems_allowed(nodemask_t nodemask)
  {
  }

  static inline unsigned int read_mems_allowed_begin(void)

  {

  	return 0;

  }

  static inline bool read_mems_allowed_retry(unsigned int seq)

  {

  	return false;

  }

  #endif /* !CONFIG_CPUSETS */
  
  #endif /* _LINUX_CPUSET_H */