[PATCH/RFCv4,1/6] lib: rbtree: rb_root_init() function added

Commit Message

Michał Nazarewicz Aug. 20, 2010, 9:50 a.m. UTC

None

Patch

diff --git a/include/linux/rbtree.h b/include/linux/rbtree.h
index 7066acb..5b6dc66 100644
--- a/include/linux/rbtree.h
+++ b/include/linux/rbtree.h
@@ -130,6 +130,17 @@  static inline void rb_set_color(struct rb_node *rb, int color)
 }
 
 #define RB_ROOT	(struct rb_root) { NULL, }
+
+static inline void rb_root_init(struct rb_root *root, struct rb_node *node)
+{
+	root->rb_node = node;
+	if (node) {
+		node->rb_parent_color = RB_BLACK; /* black, no parent */
+		node->rb_left  = NULL;
+		node->rb_right = NULL;
+	}
+}
+
 #define	rb_entry(ptr, type, member) container_of(ptr, type, member)
 
 #define RB_EMPTY_ROOT(root)	((root)->rb_node == NULL)