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[IPV4]: Avoid common branch misprediction while checking csum in ip_rcv()
author
Thomas Graf
<tgraf@suug.ch>
Sun, 21 Aug 2005 00:25:52 +0000
(17:25 -0700)
committer
David S. Miller
<davem@sunset.davemloft.net>
Mon, 29 Aug 2005 23:02:57 +0000
(16:02 -0700)
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv4/ip_input.c
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diff --git
a/net/ipv4/ip_input.c
b/net/ipv4/ip_input.c
index
322b082
..
6a06e15
100644
(file)
--- 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);