[S390] omit frame pointers on s390 when possible

[safe/jmp/linux-2.6] / lib / rbtree.c

diff --git a/lib/rbtree.c b/lib/rbtree.c
index 1e55ba1..f653659 100644 (file)
--- a/lib/rbtree.c
+++ b/lib/rbtree.c
@@ -163,17 +163,14 @@ static void __rb_erase_color(struct rb_node *node, struct rb_node *parent,
                        {
                                if (!other->rb_right || rb_is_black(other->rb_right))
                                {
-                                       struct rb_node *o_left;
-                                       if ((o_left = other->rb_left))
-                                               rb_set_black(o_left);
+                                       rb_set_black(other->rb_left);
                                        rb_set_red(other);
                                        __rb_rotate_right(other, root);
                                        other = parent->rb_right;
                                }
                                rb_set_color(other, rb_color(parent));
                                rb_set_black(parent);
-                               if (other->rb_right)
-                                       rb_set_black(other->rb_right);
+                               rb_set_black(other->rb_right);
                                __rb_rotate_left(parent, root);
                                node = root->rb_node;
                                break;
@@ -200,17 +197,14 @@ static void __rb_erase_color(struct rb_node *node, struct rb_node *parent,
                        {
                                if (!other->rb_left || rb_is_black(other->rb_left))
                                {
-                                       register struct rb_node *o_right;
-                                       if ((o_right = other->rb_right))
-                                               rb_set_black(o_right);
+                                       rb_set_black(other->rb_right);
                                        rb_set_red(other);
                                        __rb_rotate_left(other, root);
                                        other = parent->rb_left;
                                }
                                rb_set_color(other, rb_color(parent));
                                rb_set_black(parent);
-                               if (other->rb_left)
-                                       rb_set_black(other->rb_left);
+                               rb_set_black(other->rb_left);
                                __rb_rotate_right(parent, root);
                                node = root->rb_node;
                                break;
@@ -292,7 +286,7 @@ EXPORT_SYMBOL(rb_erase);
 /*
  * This function returns the first node (in sort order) of the tree.
  */
-struct rb_node *rb_first(struct rb_root *root)
+struct rb_node *rb_first(const struct rb_root *root)
 {
        struct rb_node  *n;
 
@@ -305,7 +299,7 @@ struct rb_node *rb_first(struct rb_root *root)
 }
 EXPORT_SYMBOL(rb_first);
 
-struct rb_node *rb_last(struct rb_root *root)
+struct rb_node *rb_last(const struct rb_root *root)
 {
        struct rb_node  *n;
 
@@ -318,17 +312,20 @@ struct rb_node *rb_last(struct rb_root *root)
 }
 EXPORT_SYMBOL(rb_last);
 
-struct rb_node *rb_next(struct rb_node *node)
+struct rb_node *rb_next(const struct rb_node *node)
 {
        struct rb_node *parent;
 
+       if (rb_parent(node) == node)
+               return NULL;
+
        /* If we have a right-hand child, go down and then left as far
           as we can. */
        if (node->rb_right) {
                node = node->rb_right; 
                while (node->rb_left)
                        node=node->rb_left;
-               return node;
+               return (struct rb_node *)node;
        }
 
        /* No right-hand children.  Everything down and left is
@@ -344,17 +341,20 @@ struct rb_node *rb_next(struct rb_node *node)
 }
 EXPORT_SYMBOL(rb_next);
 
-struct rb_node *rb_prev(struct rb_node *node)
+struct rb_node *rb_prev(const struct rb_node *node)
 {
        struct rb_node *parent;
 
+       if (rb_parent(node) == node)
+               return NULL;
+
        /* If we have a left-hand child, go down and then right as far
           as we can. */
        if (node->rb_left) {
                node = node->rb_left; 
                while (node->rb_right)
                        node=node->rb_right;
-               return node;
+               return (struct rb_node *)node;
        }
 
        /* No left-hand children. Go up till we find an ancestor which