reproduce:
        # https://github.com/LinuxSecurityModule/kernel/commit/fac1e95155f2b940a514438e0b25c0fd543207d7
        git remote add linuxsecuritymodule https://github.com/LinuxSecurityModule/kernel
        git fetch --no-tags linuxsecuritymodule main
        git checkout fac1e95155f2b940a514438e0b25c0fd543207d7
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # pip install -r Documentation/sphinx/requirements.txt
        make htmldocs