Merge branch 'rtnetlink-reduce-rtnl-pressure'

Eric Dumazet says:

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rtnetlink: reduce RTNL pressure for dumps

This series restarts the conversion of rtnl dump operations
to RCU protection, instead of requiring RTNL.

In this new attempt (prior one failed in 2011), I chose to
allow a gradual conversion of selected operations.

After this series, "ip -6 addr" and "ip -4 ro" no longer
need to acquire RTNL.

I refrained from changing inet_dump_ifaddr() and inet6_dump_addr()
to avoid merge conflicts because of two fixes in net tree.

I also started the work for "ip link" future conversion.

v2: rtnl_fill_link_ifmap() always emit IFLA_MAP (Jiri Pirko)
    Added "nexthop: allow nexthop_mpath_fill_node()
           to be called without RTNL" to avoid a lockdep splat (Ido Schimmel)
====================

Signed-off-by: David S. Miller <davem@davemloft.net>