reproduce (this is a W=1 build):
        # https://github.com/xinli-intel/linux-fred-public/commit/027fda52cb9f7f1c6eabf9620adcf63d0a8918e8
        git remote add xinli-intel-fred-public https://github.com/xinli-intel/linux-fred-public.git
        git fetch --no-tags xinli-intel-fred-public fix_sp_calculation
        git checkout 027fda52cb9f7f1c6eabf9620adcf63d0a8918e8
        # save the config file
        make W=1 ARCH=x86_64 olddefconfig
        make W=1 ARCH=x86_64