reproduce:
        git checkout 9bdbf7eb25b3121ef19533df4fb70f2c39fc0d6a
        b4 shazam https://lore.kernel.org/r/20260402-drm-drm-atomic-update-v3-2-b826f51ac511@kernel.org
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # pip install -r Documentation/sphinx/requirements.txt
        make htmldocs