reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/reinette/linux.git/commit/?id=fbed64f80515241bc6da124585328fd5047a4a13
        git remote add reinette https://git.kernel.org/pub/scm/linux/kernel/git/reinette/linux.git
        git fetch --no-tags reinette resctrl/controls_rfc_v2
        git checkout fbed64f80515241bc6da124585328fd5047a4a13

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 olddefconfig
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash arch/x86/kernel/cpu/resctrl/