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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 commit0ed37ac586("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/merge_config.sh -m .config \ ./tools/testing/selftests/net/mptcp/config Fixes:010b430d5d("mptcp: MPTCP_IPV6 should depend on IPV6 instead of selecting it") Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net> Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Link: https://lore.kernel.org/r/20201021155549.933731-1-matthieu.baerts@tessares.net Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.