reproduce:
        git checkout linus/master
        b4 shazam https://lore.kernel.org/r/20260125071501.12616-1-qby140326@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