reproduce:
        # https://github.com/AsahiLinux/linux/commit/e58fcf1783e145ebf6a5e11dd9e7a4f26d2fb88b
        git remote add asahilinux https://github.com/AsahiLinux/linux
        git fetch --no-tags asahilinux bits/005-maintainers
        git checkout e58fcf1783e145ebf6a5e11dd9e7a4f26d2fb88b
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # install Sphinx 2.4.4
        make htmldocs