netdev - Re: [PATCH net] tipc: not enable tipc when ipv6 works as a module

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Date:   Mon, 17 Aug 2020 12:26:03 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Randy Dunlap <rdunlap@...radead.org>
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 Mon, Aug 17, 2020 at 12:00 PM Randy Dunlap <rdunlap@...radead.org> wrote:
>
> 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.

Please give it a try. I do not see how it allows IPV6=m and TIPC=m
but disallows IPV6=m and TIPC=y.

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

True, we rely on request_module(). But I do not see TIPC calls
request_module() to request IPV6 module to load "ipv6_dev_find".

Thanks.