#ifndef __LINUX_PAGEISOLATION_H
  #define __LINUX_PAGEISOLATION_H
  
  #ifdef CONFIG_MEMORY_ISOLATION
  static inline bool is_migrate_isolate_page(struct page *page)
  {
  	return get_pageblock_migratetype(page) == MIGRATE_ISOLATE;
  }
  static inline bool is_migrate_isolate(int migratetype)
  {
  	return migratetype == MIGRATE_ISOLATE;
  }
  #else
  static inline bool is_migrate_isolate_page(struct page *page)
  {
  	return false;
  }
  static inline bool is_migrate_isolate(int migratetype)
  {
  	return false;
  }
  #endif
  
  bool has_unmovable_pages(struct zone *zone, struct page *page, int count,
  			 bool skip_hwpoisoned_pages);
  void set_pageblock_migratetype(struct page *page, int migratetype);
  int move_freepages_block(struct zone *zone, struct page *page,
  				int migratetype);
  int move_freepages(struct zone *zone,
  			  struct page *start_page, struct page *end_page,
  			  int migratetype);
  
  /*
   * Changes migrate type in [start_pfn, end_pfn) to be MIGRATE_ISOLATE.
   * If specified range includes migrate types other than MOVABLE or CMA,
   * this will fail with -EBUSY.
   *
   * For isolating all pages in the range finally, the caller have to
   * free all pages in the range. test_page_isolated() can be used for
   * test it.
   */
  int
  start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
  			 unsigned migratetype, bool skip_hwpoisoned_pages);
  
  /*
   * Changes MIGRATE_ISOLATE to MIGRATE_MOVABLE.
   * target range is [start_pfn, end_pfn)
   */
  int
  undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
  			unsigned migratetype);
  
  /*
   * Test all pages in [start_pfn, end_pfn) are isolated or not.
   */
  int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn,
  			bool skip_hwpoisoned_pages);
  
  /*
   * Internal functions. Changes pageblock's migrate type.
   */
  int set_migratetype_isolate(struct page *page, bool skip_hwpoisoned_pages);
  void unset_migratetype_isolate(struct page *page, unsigned migratetype);
  struct page *alloc_migrate_target(struct page *page, unsigned long private,
  				int **resultp);
  
  #endif