reproduce:
        # https://github.com/Xilinx/linux-xlnx/commit/1dfb4885eaa39fb3269b13eee7d97481c409b8bb
        git remote add xilinx-xlnx https://github.com/Xilinx/linux-xlnx
        git fetch --no-tags xilinx-xlnx xlnx_rebase_v6.6_LTS_2024.1_update
        git checkout 1dfb4885eaa39fb3269b13eee7d97481c409b8bb
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # install Sphinx 2.4.4
        make htmldocs