reproduce (this is a W=1 build):
        git checkout fe38a6fef0e5f4ba9c21d3e26381987519b7edc7
        # 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/