reproduce:
        git checkout 18ba6034468e7949a9e2c2cf28e2e123b4fe7a50
        b4 shazam https://lore.kernel.org/r/20241013-upstream_s32cc_gmac-v3-15-d84b5a67b930@oss.nxp.com
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # install Sphinx 2.4.4
        make htmldocs