reproduce:
        git checkout 8ffd015db85fea3e15a77027fda6c02ced4d2444
        b4 shazam https://lore.kernel.org/r/20250414-tdx-rtmr-v4-5-7edfa8d98716@intel.com
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # install Sphinx 2.4.4
        make htmldocs