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Date:   Wed, 21 Oct 2020 17:35:32 -0700 (PDT)
From:   Mat Martineau <>
To:     Matthieu Baerts <>
cc:     "David S. Miller" <>,
        Jakub Kicinski <>,
        Shuah Khan <>,
        Geert Uytterhoeven <>,,,,
Subject: Re: [PATCH net] selftests: mptcp: depends on built-in IPv6

On Wed, 21 Oct 2020, Matthieu Baerts wrote:

> Recently, CONFIG_MPTCP_IPV6 no longer selects CONFIG_IPV6. As a
> consequence, if CONFIG_MPTCP_IPV6=y is added to the kconfig, it will no
> longer ensure CONFIG_IPV6=y. If it is not enabled, CONFIG_MPTCP_IPV6
> will stay disabled and selftests will fail.
> We also need CONFIG_IPV6 to be built-in. For more details, please see
> commit 0ed37ac586c0 ("mptcp: depends on IPV6 but not as a module").
> Note that 'make kselftest-merge' will take all 'config' files found in
> 'tools/testsing/selftests'. Because some of them already set
> CONFIG_IPV6=y, MPTCP selftests were still passing. But they will fail if
> MPTCP selftests are launched manually after having executed this command
> to prepare the kernel config:
>  ./scripts/kconfig/ -m .config \
>      ./tools/testing/selftests/net/mptcp/config
> Fixes: 010b430d5df5 ("mptcp: MPTCP_IPV6 should depend on IPV6 instead of selecting it")
> Signed-off-by: Matthieu Baerts <>
> ---
> tools/testing/selftests/net/mptcp/config | 1 +
> 1 file changed, 1 insertion(+)

Reviewed-by: Mat Martineau <>

Mat Martineau

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