reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # install s390 cross compiling tool for clang build
        # apt-get install binutils-s390x-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e452872b40e3f1fb92adf0d573a0a6a7c9f6ce22
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout e452872b40e3f1fb92adf0d573a0a6a7c9f6ce22
        # 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 arch/s390/appldata/ drivers/iio/light/ drivers/infiniband/core/ drivers/net/ethernet/intel/i40e/ drivers/net/ethernet/qlogic/qede/ drivers/net/ethernet/stmicro/stmmac/ drivers/of/ drivers/perf/ drivers/s390/block/ drivers/scsi/be2iscsi/ drivers/scsi/mpi3mr/ drivers/staging/fbtft/ drivers/target/ drivers/video/fbdev/matrox/ lib/crypto/ net/tls/