#ifndef __LINUX_PAGEISOLATION_H
  #define __LINUX_PAGEISOLATION_H
  
  /*
   * Changes migrate type in [start_pfn, end_pfn) to be MIGRATE_ISOLATE.
   * If specified range includes migrate types other than MOVABLE,
   * 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.
   */
  extern int
  start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn);
  
  /*
   * Changes MIGRATE_ISOLATE to MIGRATE_MOVABLE.
   * target range is [start_pfn, end_pfn)
   */
  extern int
  undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn);
  
  /*
   * test all pages in [start_pfn, end_pfn)are isolated or not.
   */
  extern int
  test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn);
  
  /*
   * Internal funcs.Changes pageblock's migrate type.
   * Please use make_pagetype_isolated()/make_pagetype_movable().
   */
  extern int set_migratetype_isolate(struct page *page);
  extern void unset_migratetype_isolate(struct page *page);
  
  
  #endif