reproduce (this is a W=1 build):
        git checkout 4d17b37b670795954fd7a70c8ec83fb705a5e2ad
        b4 shazam https://lore.kernel.org/r/20250117151033.1517882-5-Dave.Martin@arm.com
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/kernel/cpu/resctrl/