From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Mon, 18 Jul 2011 03:16:33 +0000 (+0000)
Subject: ipv4: save cpu cycles from check_leaf()
X-Git-Tag: v3.1-rc1~316^2~107
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5c74501f76360ce6f410730b9b5e5976f38e8504;p=pandora-kernel.git

ipv4: save cpu cycles from check_leaf()

Compiler is not smart enough to avoid double BSWAP instructions in
ntohl(inet_make_mask(plen)).

Lets cache this value in struct leaf_info, (fill a hole on 64bit arches)

With route cache disabled, this saves ~2% of cpu in udpflood bench on
x86_64 machine.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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