From mboxrd@z Thu Jan  1 00:00:00 1970
From: Cong Wang <xiyou.wangcong@gmail.com>
Subject: Re: [PATCH v5 2/2] sock: Move the socket inuse to namespace.
Date: Fri, 8 Dec 2017 14:09:12 -0800
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Cc: Eric Dumazet <eric.dumazet@gmail.com>,
        David Miller <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Willem de Bruijn <willemb@google.com>,
        Linux Kernel Network Developers <netdev@vger.kernel.org>
To: Tonghao Zhang <xiangxia.m.yue@gmail.com>
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On Thu, Dec 7, 2017 at 9:28 PM, Tonghao Zhang <xiangxia.m.yue@gmail.com> wrote:
>
> Release the netlink sock created in kernel(not hold the _net_ namespace):
>

You can avoid counting kernel sock by testing 'kern' in sk_alloc()
and testing 'sk->sk_net_refcnt' in __sk_free().