reproduce (this is a W=1 build):
        # https://github.com/xinli-intel/linux-fred-public/commit/fa4845cf524d2905493e299e4650dc943be4dfe4
        git remote add xinli-intel-fred-public https://github.com/xinli-intel/linux-fred-public.git
        git fetch --no-tags xinli-intel-fred-public log_dr6_changes
        git checkout fa4845cf524d2905493e299e4650dc943be4dfe4
        # 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/