Merge branch 'soreuseport-mixed-v4-v6-fixes'

Craig Gallek says:

====================
Fixes for SO_REUSEPORT and mixed v4/v6 sockets

Recent changes to the datastructures associated with SO_REUSEPORT broke
an existing behavior when equivalent SO_REUSEPORT sockets are created
using both AF_INET and AF_INET6.  This patch series restores the previous
behavior and includes a test to validate it.

This series should be a trivial merge to stable kernels (if deemed
necessary), but will have conflicts in net-next.  The following patches
recently replaced the use of hlist_nulls with hlists for UDP and TCP
socket lists:
ca065d0cf80f ("udp: no longer use SLAB_DESTROY_BY_RCU")
3b24d854cb35 ("tcp/dccp: do not touch listener sk_refcnt under synflood")

If this series is accepted, I will send an RFC for the net-next change
to assist with the merge.
====================

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