From: Eric Dumazet <edumazet@google.com>
Date: Fri, 27 Jun 2014 15:36:16 +0000 (-0700)
Subject: inet: move ipv6only in sock_common
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~149^2~240
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9fe516ba3fb29b6f6a752ffd93342fdee500ec01;p=pandora-kernel.git

inet: move ipv6only in sock_common

When an UDP application switches from AF_INET to AF_INET6 sockets, we
have a small performance degradation for IPv4 communications because of
extra cache line misses to access ipv6only information.

This can also be noticed for TCP listeners, as ipv6_only_sock() is also
used from __inet_lookup_listener()->compute_score()

This is magnified when SO_REUSEPORT is used.

Move ipv6only into struct sock_common so that it is available at
no extra cost in lookups.

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