reproduce:
        # https://git.kernel.org/pub/scm/linux/kernel/git/cris/linux.git/commit/?id=c4f3df624c05557c708df87efde36b341fabff01
        git remote add cris https://git.kernel.org/pub/scm/linux/kernel/git/cris/linux.git
        git fetch --no-tags cris scmi_telemetry_unified_fs_V4
        git checkout c4f3df624c05557c708df87efde36b341fabff01
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # pip install -r Documentation/sphinx/requirements.txt
        make htmldocs