diff --git a/include/linux/radix-tree.h b/include/linux/radix-tree.h
index c57ff2f..dd83cca 100644
--- a/include/linux/radix-tree.h
+++ b/include/linux/radix-tree.h
@@ -45,6 +45,8 @@
 	(root)->rnode = NULL;						\
 } while (0)
 
+#define RADIX_TREE_MAX_TAGS 2
+
 int radix_tree_insert(struct radix_tree_root *, unsigned long, void *);
 void *radix_tree_lookup(struct radix_tree_root *, unsigned long);
 void **radix_tree_lookup_slot(struct radix_tree_root *, unsigned long);
@@ -55,15 +57,16 @@
 int radix_tree_preload(gfp_t gfp_mask);
 void radix_tree_init(void);
 void *radix_tree_tag_set(struct radix_tree_root *root,
-			unsigned long index, int tag);
+			unsigned long index, unsigned int tag);
 void *radix_tree_tag_clear(struct radix_tree_root *root,
-			unsigned long index, int tag);
+			unsigned long index, unsigned int tag);
 int radix_tree_tag_get(struct radix_tree_root *root,
-			unsigned long index, int tag);
+			unsigned long index, unsigned int tag);
 unsigned int
 radix_tree_gang_lookup_tag(struct radix_tree_root *root, void **results,
-		unsigned long first_index, unsigned int max_items, int tag);
-int radix_tree_tagged(struct radix_tree_root *root, int tag);
+		unsigned long first_index, unsigned int max_items,
+		unsigned int tag);
+int radix_tree_tagged(struct radix_tree_root *root, unsigned int tag);
 
 static inline void radix_tree_preload_end(void)
 {