reproduce:
        git checkout c2012263047689e495e81c96d7d5b0586299578d
        b4 shazam https://lore.kernel.org/r/20260303000207.1836586-9-dan.j.williams@intel.com
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # pip install -r Documentation/sphinx/requirements.txt
        make htmldocs