Merge branch 'tcp_get_info-locking'

Eric Dumazet says:

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tcp: tcp_get_info() locking changes

This short series prepares tcp_get_info() for more detailed infos.

In order to not slow down fast path, our goal is to use the normal
socket spinlock instead of custom synchronization.

All we need to ensure is that tcp_get_info() is not called with
ehash lock, which might dead lock, since packet processing would acquire
the spinlocks in reverse way.
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Signed-off-by: David S. Miller <davem@davemloft.net>

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