#include <linux/interval_tree.h>
  #include <linux/interval_tree_generic.h>
  #include <linux/compiler.h>
  #include <linux/export.h>
  
  #define START(node) ((node)->start)
  #define LAST(node)  ((node)->last)
  
  INTERVAL_TREE_DEFINE(struct interval_tree_node, rb,
  		     unsigned long, __subtree_last,
  		     START, LAST,, interval_tree)
  
  EXPORT_SYMBOL_GPL(interval_tree_insert);
  EXPORT_SYMBOL_GPL(interval_tree_remove);
  EXPORT_SYMBOL_GPL(interval_tree_iter_first);
  EXPORT_SYMBOL_GPL(interval_tree_iter_next);