reproduce:
        # https://github.com/intel-lab-lkp/linux/commit/745e2c3a79e2e0369ee5dbd1e650b1fddbed477f
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review David-equinox-Lamparter/net-ipv6-fix-lookup-for-0-non-subtree-route/20260714-174919
        git checkout 745e2c3a79e2e0369ee5dbd1e650b1fddbed477f
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # pip install -r Documentation/sphinx/requirements.txt
        make htmldocs