reproduce:
        git checkout 6381a729fa7dda43574d93ab9c61cec516dd885b
        b4 shazam https://lore.kernel.org/r/20260325175453.2523280-4-youngjun.park@lge.com
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # pip install -r Documentation/sphinx/requirements.txt
        make htmldocs