reproduce:
        git checkout 9d4f8e54cef2c42e23ef258833dbd06a1eaff89b
        b4 shazam https://lore.kernel.org/r/20250206-dthe-v2-aes-v1-1-1e86cf683928@ti.com
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # install Sphinx 2.4.4
        make htmldocs