From: Julian Anastasov <ja@ssi.bg>
Date: Wed, 18 Jul 2012 10:15:35 +0000 (+0000)
Subject: ipv4: use seqlock for nh_exceptions
X-Git-Tag: v3.6-rc1~125^2~80
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=aee06da6726d4981c51928c2d6d1e2cabeec7a10;p=pandora-kernel.git

ipv4: use seqlock for nh_exceptions

Use global seqlock for the nh_exceptions. Call
fnhe_oldest with the right hash chain. Correct the diff
value for dst_set_expires.

v2: after suggestions from Eric Dumazet:
* get rid of spin lock fnhe_lock, rearrange update_or_create_fnhe
* continue daddr search in rt_bind_exception

v3:
* remove the daddr check before seqlock in rt_bind_exception
* restart lookup in rt_bind_exception on detected seqlock change,
as suggested by David Miller

Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: David S. Miller <davem@davemloft.net>
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