From: Eric Dumazet <edumazet@google.com>
Date: Fri, 3 Aug 2012 21:27:25 +0000 (+0000)
Subject: ipv4: Introduce IN_DEV_NET_ROUTE_LOCALNET
X-Git-Tag: omap-for-v3.7-rc1/fixes-cpufreq-signed~47^2~363
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9eb43e765368f835d92c93844ebce30da7efeb84;p=pandora-kernel.git

ipv4: Introduce IN_DEV_NET_ROUTE_LOCALNET

performance profiles show a high cost in the IN_DEV_ROUTE_LOCALNET()
call done in ip_route_input_slow(), because of multiple dereferences,
even if cache lines are clean and available in cpu caches.

Since we already have the 'net' pointer, introduce
IN_DEV_NET_ROUTE_LOCALNET() macro avoiding two dereferences
(dev_net(in_dev->dev))

Also change the tests to use IN_DEV_NET_ROUTE_LOCALNET() only if saddr
or/and daddr are loopback addresse.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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