From: "Denis V. Lunev" <den@openvz.org>
Date: Wed, 7 Nov 2007 15:00:07 +0300

> If CONFIG_NET_NS is not set, the only namespace is possible.
> 
> This patch removes list of pernet_operations and cleanups code a bit.
> This list is not needed if there are no namespaces. We should just call
> ->init method.
> 
> Additionally, the ->exit will be called on module unloading only. This
> case is safe - the code is not discarded. For the in/kernel code, ->exit
> should never be called.
> 
> Signed-off-by: Denis V. Lunev <den@openvz.org>

Applied.