Index: sys/sys/rbtree.h
===================================================================
RCS file: /cvsroot/src/sys/sys/rbtree.h,v
retrieving revision 1.2
diff -p -u -r1.2 rbtree.h
--- sys/sys/rbtree.h	17 Feb 2012 08:20:55 -0000	1.2
+++ sys/sys/rbtree.h	10 Nov 2016 15:27:28 -0000
@@ -148,7 +152,8 @@ typedef struct {
 } rb_tree_ops_t;
 
 typedef struct rb_tree {
-	struct rb_node *rbt_root;
+	struct rb_node _rbt_root;
+#define	rbt_root	_rbt_root.rb_left
 	const rb_tree_ops_t *rbt_ops;
 	struct rb_node *rbt_minmax[2];
 #ifdef RBDEBUG