mm: share PG_readahead and PG_reclaim

[karo-tx-linux.git] / include / linux / rbtree.h

diff --git a/include/linux/rbtree.h b/include/linux/rbtree.h
index f37006f21664877fc138b437df04b210bc81cdb2..344bc3495ddbd12548c32ebaf57cd3c6ee7e8be9 100644 (file)
--- 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 *);