X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=include%2Flinux%2Frbtree.h;h=344bc3495ddbd12548c32ebaf57cd3c6ee7e8be9;hb=28cb5ccd306e6cffd4498ba350bc7c82f5fbee44;hp=ffee81ce7b6f95ee45f1d1a9960acd569afdd6e5;hpb=7fe1e133bf45b0fe70491ed3d4c5b491feff7aa8;p=safe%2Fjmp%2Flinux-2.6

diff --git a/include/linux/rbtree.h b/include/linux/rbtree.h
index ffee81c..344bc34 100644
--- a/include/linux/rbtree.h
+++ b/include/linux/rbtree.h
@@ -99,31 +99,43 @@ static inline struct page * rb_insert_page_cache(struct inode * inode,
 
 struct rb_node
 {
-	struct rb_node *rb_parent;
-	int rb_color;
+	unsigned long  rb_parent_color;
 #define	RB_RED		0
 #define	RB_BLACK	1
 	struct rb_node *rb_right;
 	struct rb_node *rb_left;
-};
-
-#define rb_parent(r)		((r)->rb_parent)
-#define rb_set_parent(r,p)	do { (r)->rb_parent = p; } while (0)
-#define rb_colour(r)		((r)->rb_colour)
-#define rb_is_red(r)		((r)->colour == RB_RED)
-#define rb_is_black(r)		((r)->colour == RB_BLACK)
-#define rb_set_red(r)		do { (r)->colour = RB_RED; } while (0)
-#define rb_set_black(r)		do { (r)->colour = RB_BLACK; } while (0)
-#define rb_set_colour(r,c)	do { (r)->colour = (c); } while (0)
+} __attribute__((aligned(sizeof(long))));
+    /* The alignment might seem pointless, but allegedly CRIS needs it */
 
 struct rb_root
 {
 	struct rb_node *rb_node;
 };
 
+
+#define rb_parent(r)   ((struct rb_node *)((r)->rb_parent_color & ~3))
+#define rb_color(r)   ((r)->rb_parent_color & 1)
+#define rb_is_red(r)   (!rb_color(r))
+#define rb_is_black(r) rb_color(r)
+#define rb_set_red(r)  do { (r)->rb_parent_color &= ~1; } while (0)
+#define rb_set_black(r)  do { (r)->rb_parent_color |= 1; } while (0)
+
+static inline void rb_set_parent(struct rb_node *rb, struct rb_node *p)
+{
+	rb->rb_parent_color = (rb->rb_parent_color & 3) | (unsigned long)p;
+}
+static inline void rb_set_color(struct rb_node *rb, int color)
+{
+	rb->rb_parent_color = (rb->rb_parent_color & ~1) | 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 *);
 
@@ -140,8 +152,7 @@ extern void rb_replace_node(struct rb_node *victim, struct rb_node *new,
 static inline void rb_link_node(struct rb_node * node, struct rb_node * parent,
 				struct rb_node ** rb_link)
 {
-	node->rb_parent = parent;
-	node->rb_color = RB_RED;
+	node->rb_parent_color = (unsigned long )parent;
 	node->rb_left = node->rb_right = NULL;
 
 	*rb_link = node;