reproduce:
        git checkout f74d204baf9febf96237af6c1d7eff57fba7de36
        b4 shazam https://lore.kernel.org/r/20260303104215.1324243-1-tommaso.cucinotta@santannapisa.it
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # pip install -r Documentation/sphinx/requirements.txt
        make htmldocs