From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Sun, 8 Nov 2009 10:17:58 +0000 (+0000)
Subject: udp: secondary hash on (local port, local address)
X-Git-Tag: v2.6.33-rc1~388^2~459
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=512615b6b843ff3ff5ad583f34c39b3f302f5f26;p=pandora-kernel.git

udp: secondary hash on (local port, local address)

Extends udp_table to contain a secondary hash table.

socket anchor for this second hash is free, because UDP
doesnt use skc_bind_node : We define an union to hold
both skc_bind_node & a new hlist_nulls_node udp_portaddr_node

udp_lib_get_port() inserts sockets into second hash chain
(additional cost of one atomic op)

udp_lib_unhash() deletes socket from second hash chain
(additional cost of one atomic op)

Note : No spinlock lockdep annotation is needed, because
lock for the secondary hash chain is always get after
lock for primary hash chain.

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