reproduce (this is a W=1 build):
        # https://github.com/xinli-intel/linux-fred-public/commit/688f8f5d716435f44712807ae801abfb1c1f5c50
        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 688f8f5d716435f44712807ae801abfb1c1f5c50
        # save the config file
        make W=1 ARCH=x86_64 olddefconfig
        make W=1 ARCH=x86_64