reproduce (this is a W=1 build):
        git remote add drm-tip https://gitlab.freedesktop.org/drm/tip.git
        git fetch --no-tags drm-tip drm-tip
        git checkout 443d3c62afbe3786b074bbb40f7449823c898738

        # 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