reproduce:
        git checkout 192c0159402e6bfbe13de6f8379546943297783d
        b4 shazam https://lore.kernel.org/r/20260507180646.40356-1-gbatra@linux.ibm.com
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # pip install -r Documentation/sphinx/requirements.txt
        make htmldocs