reproduce (this is a W=1 build):
        # https://github.com/jsarha/linux/commit/872c91b9b3e71479285202070e518727735257e8
        git remote add jsarha https://github.com/jsarha/linux
        git fetch --no-tags jsarha topic/chromeos-4.19-s0ix
        git checkout 872c91b9b3e71479285202070e518727735257e8
        # 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 drivers/gpu/drm/