linux-kernel - [PATCH 3/3] Further optimization of function rb

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Message-ID: <20090410102404.247130@gmx.net>
Date:	Fri, 10 Apr 2009 12:24:04 +0200
From:	"Wolfram Strepp" <wstrepp@....de>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org, peterz@...radead.org, lowdanie@...il.com
Subject: [PATCH 3/3] Further optimization of function rb_erase() in
 lib/rbtree.c

Furthermore, notice that the initial checks:

	if (!node->rb_left)
		child = node->rb_right;
	else if (!node->rb_right)
		child = node->rb_left;
	else
	{
		...
	}
guarantee that old->rb_right is set in the final else branch, therefore
we can omit checking that again.

Signed-off-by: Wolfram Strepp <wstrepp@....de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
---
 lib/rbtree.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
Index: linux-2.6/lib/rbtree.c
===================================================================
--- linux-2.6.orig/lib/rbtree.c
+++ linux-2.6/lib/rbtree.c
@@ -257,15 +257,15 @@ void rb_erase(struct rb_node *node, stru
 			if (child)
 				rb_set_parent(child, parent);
 			parent->rb_left = child;
+
+			node->rb_right = old->rb_right;
+			rb_set_parent(old->rb_right, node);
 		}
 
 		node->rb_parent_color = old->rb_parent_color;
-		node->rb_right = old->rb_right;
 		node->rb_left = old->rb_left;
-
 		rb_set_parent(old->rb_left, node);
-		if (old->rb_right)
-			rb_set_parent(old->rb_right, node);
+
 		goto color;
 	}
 
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