netdev - [PATCH net-next] ipv4: use unlikely to optimise in ip

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Message-Id: <1394428209-9919-1-git-send-email-roy.qing.li@gmail.com>
Date:	Mon, 10 Mar 2014 13:10:09 +0800
From:	roy.qing.li@...il.com
To:	netdev@...r.kernel.org
Subject: [PATCH net-next] ipv4: use unlikely to optimise in ip_forward

From: Li RongQing <roy.qing.li@...il.com>

The condition that skb->pkt_type is not PACKET_HOST in ip_forward, should never
happen, so use unlikely to optimise this check

Signed-off-by: Li RongQing <roy.qing.li@...il.com>
---
 net/ipv4/ip_forward.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/ip_forward.c b/net/ipv4/ip_forward.c
index be8abe7..b82833a 100644
--- a/net/ipv4/ip_forward.c
+++ b/net/ipv4/ip_forward.c
@@ -128,7 +128,7 @@ int ip_forward(struct sk_buff *skb)
 	struct ip_options *opt	= &(IPCB(skb)->opt);
 
 	/* that should never happen */
-	if (skb->pkt_type != PACKET_HOST)
+	if (unlikely(skb->pkt_type != PACKET_HOST))
 		goto drop;
 
 	if (skb_warn_if_lro(skb))
-- 
1.7.10.4

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