linux-kernel - [PATCH V2 net-next] fib_trie: avoid a redundant bit judgement in inflate

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Message-Id: <1380461518-10095-1-git-send-email-baker.kernel@gmail.com>
Date:	Sun, 29 Sep 2013 21:31:58 +0800
From:	baker.kernel@...il.com
To:	davem@...emloft.net
Cc:	kuznet@....inr.ac.ru, jmorris@...ei.org, yoshfuji@...ux-ipv6.org,
	kaber@...sh.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"baker.zhang" <baker.kernel@...il.com>
Subject: [PATCH V2 net-next] fib_trie: avoid a redundant bit judgement in inflate

From: "baker.zhang" <baker.kernel@...il.com>

Because 'node' is the i'st child of 'oldnode',
thus, here 'i' equals
tkey_extract_bits(node->key, oldtnode->pos, oldtnode->bits)

we just get 1 more bit,
and need not care the detail value of this bits.

Signed-off-by: baker.zhang <baker.kernel@...il.com>
---
 net/ipv4/fib_trie.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index 3df6d3e..45c74ba 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -762,12 +762,9 @@ static struct tnode *inflate(struct trie *t, struct tnode *tn)
 
 		if (IS_LEAF(node) || ((struct tnode *) node)->pos >
 		   tn->pos + tn->bits - 1) {
-			if (tkey_extract_bits(node->key,
-					      oldtnode->pos + oldtnode->bits,
-					      1) == 0)
-				put_child(tn, 2*i, node);
-			else
-				put_child(tn, 2*i+1, node);
+			put_child(tn,
+				tkey_extract_bits(node->key, oldtnode->pos, oldtnode->bits + 1),
+				node);
 			continue;
 		}
 
-- 
1.8.1.2

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