X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=include%2Flinux%2Frbtree.h;h=344bc3495ddbd12548c32ebaf57cd3c6ee7e8be9;hb=8ab22b9abb5c55413802e4adc9aa6223324547c3;hp=f37006f21664877fc138b437df04b210bc81cdb2;hpb=050335db2a777ffaa859d77beb05fffe9e8c5ae9;p=linux-2.6

diff --git a/include/linux/rbtree.h b/include/linux/rbtree.h
index f37006f216..344bc3495d 100644
--- a/include/linux/rbtree.h
+++ b/include/linux/rbtree.h
@@ -132,6 +132,10 @@ static inline void rb_set_color(struct rb_node *rb, int color)
 #define RB_ROOT	(struct rb_root) { NULL, }
 #define	rb_entry(ptr, type, member) container_of(ptr, type, member)
 
+#define RB_EMPTY_ROOT(root)	((root)->rb_node == NULL)
+#define RB_EMPTY_NODE(node)	(rb_parent(node) == node)
+#define RB_CLEAR_NODE(node)	(rb_set_parent(node, node))
+
 extern void rb_insert_color(struct rb_node *, struct rb_root *);
 extern void rb_erase(struct rb_node *, struct rb_root *);