#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>
  
  #ifdef CONFIG_CPUSETS
  
  extern int number_of_cpusets;	/* How many cpusets are defined in system? */
  
  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_softwall(int node, gfp_t gfp_mask);
  extern int __cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask);
  
  static inline int cpuset_node_allowed_softwall(int node, gfp_t gfp_mask)
  {
  	return number_of_cpusets <= 1 ||
  		__cpuset_node_allowed_softwall(node, gfp_mask);
  }
  
  static inline int cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask)
  {
  	return number_of_cpusets <= 1 ||
  		__cpuset_node_allowed_hardwall(node, gfp_mask);
  }
  
  static inline int cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask)
  {
  	return cpuset_node_allowed_softwall(zone_to_nid(z), gfp_mask);
  }
  
  static inline int cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask)
  {
  	return cpuset_node_allowed_hardwall(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 *, void *);
  
  extern int cpuset_mem_spread_node(void);
  extern int cpuset_slab_spread_node(void);
  
  static inline int cpuset_do_page_mem_spread(void)
  {
  	return current->flags & PF_SPREAD_PAGE;
  }
  
  static inline int cpuset_do_slab_mem_spread(void)
  {
  	return current->flags & PF_SPREAD_SLAB;
  }
  
  extern int current_cpuset_is_being_rebound(void);
  
  extern void rebuild_sched_domains(void);
  
  extern void cpuset_print_task_mems_allowed(struct task_struct *p);
  
  /*
   * 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)
  {
  	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)
  {
  	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 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_softwall(int node, gfp_t gfp_mask)
  {
  	return 1;
  }
  
  static inline int cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask)
  {
  	return 1;
  }
  
  static inline int cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask)
  {
  	return 1;
  }
  
  static inline int cpuset_zone_allowed_hardwall(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_task_mems_allowed(struct task_struct *p)
  {
  }
  
  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 */