Merge branch 'ipv6-addrconf-hash-improvements-and-cleanups'

Eric Dumazet says:

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ipv6: addrconf: hash improvements and cleanups

Remove unecessary BH blocking, and bring IPv6 addrconf to modern world,
with per netns hash perturbation and decent hash size.
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Signed-off-by: David S. Miller <davem@davemloft.net>