reproduce (this is a W=1 build):
        # https://github.com/xinli-intel/linux-fred-public/commit/fe26083e06e9c7508dbdf6a9d06586ecd53a34fe
        git remote add xinli-intel-fred-public https://github.com/xinli-intel/linux-fred-public.git
        git fetch --no-tags xinli-intel-fred-public intel-lkp
        git checkout fe26083e06e9c7508dbdf6a9d06586ecd53a34fe
        # 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/mm/