reproduce (this is a W=1 build):
        # https://github.com/gdamjan/linux/commit/89f00ee2600546cc930a1fbad7d401bc134d54e4
        git remote add gdamjan https://github.com/gdamjan/linux
        git fetch --no-tags gdamjan v6.19/thinkpad-x9-14
        git checkout 89f00ee2600546cc930a1fbad7d401bc134d54e4

        # 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/media/i2c/