reproduce:
        git checkout 8f0b4cce4481fb22653697cced8d0d04027cb1e8
        b4 shazam https://lore.kernel.org/r/20251215141603.6749-2-linux.amoon@gmail.com
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # pip install -r Documentation/sphinx/requirements.txt
        make htmldocs