reproduce:
        # https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git/commit/?id=a2273d13b7e6bd18935bcb8c1f67d67b92cb44c6
        git remote add morse https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git
        git fetch --no-tags morse mpam/snapshot/v6.12-rc1
        git checkout a2273d13b7e6bd18935bcb8c1f67d67b92cb44c6
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        # install Sphinx 2.4.4
        make htmldocs