1 files changed, 27 insertions, 0 deletions

diff --git a/include/linux/interval_tree.h b/include/linux/interval_tree.h
new file mode 100644
index 000000000000..724556aa3c95
--- /dev/null
+++ b/include/linux/interval_tree.h
@@ -0,0 +1,27 @@
+#ifndef _LINUX_INTERVAL_TREE_H
+#define _LINUX_INTERVAL_TREE_H
+
+#include <linux/rbtree.h>
+
+struct interval_tree_node {
+        struct rb_node rb;
+        unsigned long start;    /* Start of interval */
+        unsigned long last;     /* Last location _in_ interval */
+        unsigned long __subtree_last;
+};
+
+extern void
+interval_tree_insert(struct interval_tree_node *node, struct rb_root *root);
+
+extern void
+interval_tree_remove(struct interval_tree_node *node, struct rb_root *root);
+
+extern struct interval_tree_node *
+interval_tree_iter_first(struct rb_root *root,
+                         unsigned long start, unsigned long last);
+
+extern struct interval_tree_node *
+interval_tree_iter_next(struct interval_tree_node *node,
+                        unsigned long start, unsigned long last);
+
+#endif  /* _LINUX_INTERVAL_TREE_H */