reproduce:
        git checkout f0b9d8eb98dfee8d00419aa07543bdc2c1a44fb1
        b4 shazam https://lore.kernel.org/r/20260108-documents_gendwarfksyms-v1-1-52b1f9c38c70@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