netdev - Re: [PATCH 2/3] netns: add dummy struct inside "struct net

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Date:   Thu, 1 Dec 2016 21:42:23 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Alexey Dobriyan <adobriyan@...il.com>
Cc:     David Miller <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Pavel Emelyanov <xemul@...nvz.org>
Subject: Re: [PATCH 2/3] netns: add dummy struct inside "struct net_generic"

On Thu, Dec 1, 2016 at 5:12 PM, Alexey Dobriyan <adobriyan@...il.com> wrote:
>  struct net_generic {
> -       unsigned int len;
> -       struct rcu_head rcu;
> +       struct {
> +               unsigned int len;
> +               struct rcu_head rcu;
> +       } s;
>
>         void *ptr[0];
>  };

I think you can put them in a union, since rcu is only used
for kfree_rcu() where len is not needed and rcu_head doesn't
need to be initialized by callers.