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

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Message-ID: <619601b2-40c1-9257-ef2a-2c667361aa75@tessares.net>
Date:   Wed, 21 Oct 2020 11:47:09 +0200
From:   Matthieu Baerts <matthieu.baerts@...sares.net>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     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 Geert,

On 21/10/2020 11:43, Geert Uytterhoeven wrote:
> Hi Jakub,
> 
> 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?

Cheers,
Matt
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