reproduce (this is a W=1 build):
        # https://github.com/xinli-intel/linux-fred-public/commit/8545a8c57be37b958b3d0f22aa32590d4b0f32d5
        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 8545a8c57be37b958b3d0f22aa32590d4b0f32d5
        # 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/kvm/