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-rw-r--r--include/linux/rbtree.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/rbtree.h b/include/linux/rbtree.h
index f37006f2166..8d5382e62c0 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 *);