From: Julian Anastasov <ja@ssi.bg>
Date: Thu, 21 Mar 2013 09:58:08 +0000 (+0200)
Subject: ipvs: remove rs_lock by using RCU
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~65^2~235^2~38
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=276472eae063d717b775fdfc87529937402d0e08;p=pandora-kernel.git

ipvs: remove rs_lock by using RCU

rs_lock was used to protect rs_table (hash table)
from updaters (under global mutex) and readers (packet handlers).
We can remove rs_lock by using RCU lock for readers. Reclaiming
dest only with kfree_rcu is enough because the readers access
only fields from the ip_vs_dest structure.

Use hlist for rs_table.

As we are now using hlist_del_rcu, introduce in_rs_table
flag as replacement for the list_empty checks which do not
work with RCU. It is needed because only NAT dests are in
the rs_table.

Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off by: Hans Schillstrom <hans@schillstrom.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
---

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