reproduce:
        # https://github.com/LinuxSecurityModule/kernel/commit/0b9bc2a3c36b742f372ce72d6bd3049841a48dc1
        git remote add linuxsecuritymodule https://github.com/LinuxSecurityModule/kernel
        git fetch --no-tags linuxsecuritymodule main
        git checkout 0b9bc2a3c36b742f372ce72d6bd3049841a48dc1
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # pip install -r Documentation/sphinx/requirements.txt
        make htmldocs