/******************************************************************************
   * Xen balloon functionality
   */
  
  #define RETRY_UNLIMITED	0
  
  struct balloon_stats {
  	/* We aim for 'current allocation' == 'target allocation'. */
  	unsigned long current_pages;
  	unsigned long target_pages;
  	/* Number of pages in high- and low-memory balloons. */
  	unsigned long balloon_low;
  	unsigned long balloon_high;
  	unsigned long schedule_delay;
  	unsigned long max_schedule_delay;
  	unsigned long retry_count;
  	unsigned long max_retry_count;

  #ifdef CONFIG_XEN_BALLOON_MEMORY_HOTPLUG
  	unsigned long hotplug_pages;
  	unsigned long balloon_hotplug;
  #endif

  };
  
  extern struct balloon_stats balloon_stats;
  
  void balloon_set_new_target(unsigned long target);

  int alloc_xenballooned_pages(int nr_pages, struct page **pages,
  		bool highmem);
  void free_xenballooned_pages(int nr_pages, struct page **pages);

  struct device;

  #ifdef CONFIG_XEN_SELFBALLOONING

  extern int register_xen_selfballooning(struct device *dev);

  #else

  static inline int register_xen_selfballooning(struct device *dev)

  {
  	return -ENOSYS;
  }
  #endif