reproduce (this is a W=1 build):
        # https://github.com/jsarha/linux/commit/e97c9a30072a51c17c54b6c23614fbdeeff33e47
        git remote add jsarha https://github.com/jsarha/linux
        git fetch --no-tags jsarha topic/chromeos-4.19-s0ix
        git checkout e97c9a30072a51c17c54b6c23614fbdeeff33e47
        # 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 kernel/