linux-kernel - Re: [PATCH] mptcp: MPTCP_IPV6 should depend on IPV6 instead of selecting it

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Message-ID: <CAMuHMdXUs_2DodcYva8bP+Df979TMrmRD=+LUiVVzdH0zmxK1Q@mail.gmail.com>
Date:   Wed, 21 Oct 2020 11:52:21 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Matthieu Baerts <matthieu.baerts@...sares.net>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        "David S . Miller" <davem@...emloft.net>,
        Florian Westphal <fw@...len.de>,
        Peter Krystad <peter.krystad@...ux.intel.com>,
        netdev <netdev@...r.kernel.org>, mptcp@...ts.01.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mptcp: MPTCP_IPV6 should depend on IPV6 instead of
 selecting it

Hi Matthieu,

On Wed, Oct 21, 2020 at 11:47 AM Matthieu Baerts
<matthieu.baerts@...sares.net> wrote:
> On 21/10/2020 11:43, Geert Uytterhoeven wrote:
> > On Wed, Oct 21, 2020 at 5:56 AM Jakub Kicinski <kuba@...nel.org> wrote:
> >> On Tue, 20 Oct 2020 11:26:34 +0200 Matthieu Baerts wrote:
> >>> On 20/10/2020 09:38, Geert Uytterhoeven wrote:
> >>>> MPTCP_IPV6 selects IPV6, thus enabling an optional feature the user may
> >>>> not want to enable.  Fix this by making MPTCP_IPV6 depend on IPV6, like
> >>>> is done for all other IPv6 features.
> >>>
> >>> Here again, the intension was to select IPv6 from MPTCP but I understand
> >>> the issue: if we enable MPTCP, we will select IPV6 as well by default.
> >>> Maybe not what we want on some embedded devices with very limited memory
> >>> where IPV6 is already off. We should instead enable MPTCP_IPV6 only if
> >>> IPV6=y. LGTM then!
> >>>
> >>> Reviewed-by: Matthieu Baerts <matthieu.baerts@...sares.net>
> >>
> >> Applied, thanks!
> >
> > My apologies, this fails for the CONFIG_IPV6=m and CONFIG_MPTCP=y
> > case:
>
> Good point, MPTCP cannot be compiled as a module (like TCP). It should
> then depends on IPV6=y. I thought it would be the case.
>
> Do you want me to send a patch or do you already have one?

I don't have a patch yet, so feel free to send one.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds