From: Johannes Berg <johannes@sipsolutions.net>
Date: Fri, 10 Jul 2009 09:51:32 +0000 (+0000)
Subject: netlink: use call_rcu for netlink_change_ngroups
X-Git-Tag: v2.6.32-rc1~703^2~639
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6c04bb18ddd633b7feac2c8fe2ae0bf61d20ca7a;p=pandora-kernel.git

netlink: use call_rcu for netlink_change_ngroups

For the network namespace work in generic netlink I need
to be able to call this function under rcu_read_lock(),
otherwise the locking becomes a nightmare and more locks
would be needed. Instead, just embed a struct rcu_head
(actually a struct listeners_rcu_head that also carries
the pointer to the memory block) into the listeners
memory so we can use call_rcu() instead of synchronising
and then freeing. No rcu_barrier() is needed since this
code cannot be modular.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
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