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Often the code for example in drivers is interested in getting notifier call only from certain network namespace. In addition to the existing global netdevice notifier chain introduce per-netns chains and allow users to register to that. Eventually this would eliminate unnecessary overhead in case there are many netdevices in many network namespaces. Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>