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Date:   Mon, 17 Aug 2020 12:00:23 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     Xin Long <lucien.xin@...il.com>,
        network dev <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Jon Maloy <jmaloy@...hat.com>,
        Ying Xue <ying.xue@...driver.com>,
        tipc-discussion@...ts.sourceforge.net
Subject: Re: [PATCH net] tipc: not enable tipc when ipv6 works as a module

On 8/17/20 11:55 AM, Cong Wang wrote:
> On Mon, Aug 17, 2020 at 11:49 AM Randy Dunlap <rdunlap@...radead.org> wrote:
>>
>> On 8/17/20 11:31 AM, Cong Wang wrote:
>>> On Sun, Aug 16, 2020 at 11:37 PM Xin Long <lucien.xin@...il.com> wrote:
>>>>
>>>> On Mon, Aug 17, 2020 at 2:29 AM Cong Wang <xiyou.wangcong@...il.com> wrote:
>>>>>
>>>>> Or put it into struct ipv6_stub?
>>>> Hi Cong,
>>>>
>>>> That could be one way. We may do it when this new function becomes more common.
>>>> By now, I think it's okay to make TIPC depend on IPV6 || IPV6=n.
>>>
>>> I am not a fan of IPV6=m, but disallowing it for one symbol seems
>>> too harsh.
>>
>> Hi,
>>
>> Maybe I'm not following you, but this doesn't disallow IPV6=m.
> 
> Well, by "disallowing IPV6=m" I meant "disallowing IPV6=m when
> enabling TIPC" for sure... Sorry that it misleads you to believe
> completely disallowing IPV6=m globally.
> 
>>
>> It just restricts how TIPC can be built, so that
>> TIPC=y and IPV6=m cannot happen together, which causes
>> a build error.
> 
> It also disallows TIPC=m and IPV6=m, right? In short, it disalows
> IPV6=m when TIPC is enabled. And this is exactly what I complain,
> as it looks too harsh.

I haven't tested that specifically, but that should work.
This patch won't prevent that from working.

We have loadable modules calling other loadable modules
all over the kernel.

-- 
~Randy

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