reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git/commit/?id=84cd8de2b92a1ccf493c43da8b31bb983d320ca7
        git remote add akpm-mm https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git
        git fetch --no-tags akpm-mm mm-new
        git checkout 84cd8de2b92a1ccf493c43da8b31bb983d320ca7

        # save the config file
        make W=1 ARCH=x86_64 olddefconfig
        make W=1 headers_install
        make W=1 -C tools/thermal/lib
        make W=1 -C tools/lib/api
        make W=1 tools/all