reproduce:
        # https://github.com/gourryinverse/linux/commit/0d092fc9475c8714f7b235ef04a0f86c04406f7f
        git remote add gourryinverse https://github.com/gourryinverse/linux
        git fetch --no-tags gourryinverse djhacks
        git checkout 0d092fc9475c8714f7b235ef04a0f86c04406f7f
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # pip install -r Documentation/sphinx/requirements.txt
        make htmldocs