From: Thomas Graf <tgraf@suug.ch>
Date: Sun, 21 Aug 2005 00:25:52 +0000 (-0700)
Subject: [IPV4]: Avoid common branch misprediction while checking csum in ip_rcv()
X-Git-Tag: firefly_0821_release~42189^2~55
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=e9c604227391308b185aa6b14c7f93b0a0c2e51b;p=firefly-linux-kernel-4.4.55.git

[IPV4]: Avoid common branch misprediction while checking csum in ip_rcv()

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index 322b082ede1e..6a06e15694dc 100644
--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -400,7 +400,7 @@ int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
 
 	iph = skb->nh.iph;
 
-	if (ip_fast_csum((u8 *)iph, iph->ihl) != 0)
+	if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
 		goto inhdr_error;
 
 	len = ntohs(iph->tot_len);