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/next/linux-next.git/commit/?id=a3fca4a1309219709b9e66964593d5abac13786c
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout a3fca4a1309219709b9e66964593d5abac13786c
        # 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 block/ drivers/clk/ drivers/gpu/drm/ drivers/infiniband/sw/rxe/ drivers/iommu/iommufd/ drivers/media/platform/renesas/vsp1/ drivers/mtd/devices/ drivers/net/ethernet/intel/libeth/ drivers/net/vxlan/ drivers/nvdimm/ drivers/pci/ drivers/pinctrl/ fs/ lib/ mm/ net/ethtool/ security/apparmor/ virt/lib/