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