reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git/commit/?id=f498eb811e7dd7b968743a9bba20710a5070c0be
        git remote add linusw-gpio https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git
        git fetch --no-tags linusw-gpio b4/descriptors-wireless
        git checkout f498eb811e7dd7b968743a9bba20710a5070c0be

        # install s390 cross compiling tool for clang build
        # apt-get install binutils-s390x-linux-gnu
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-18 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=s390 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-18 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash drivers/gpio/