reproduce:
        # https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git/commit/?id=1c58b89b79f03fd9013a8a2da78f87424fbcb97f
        git remote add morse https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git
        git fetch --no-tags morse mpam/snapshot/v6.11-rc1
        git checkout 1c58b89b79f03fd9013a8a2da78f87424fbcb97f
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # install Sphinx 2.4.4
        make htmldocs