reproduce:
        git remote add rafael-pm https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git
        git fetch rafael-pm linux-next
        git checkout rafael-pm/linux-next
        b4 shazam https://lore.kernel.org/r/20230905015116.2268926-7-li.meng@amd.com
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # install Sphinx 2.4.4
        make htmldocs