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=ce3297eef13a5e5c03f99dc81fa4948340938b36
        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 ce3297eef13a5e5c03f99dc81fa4948340938b36
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-19 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=s390 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-19 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash crypto/ drivers/auxdisplay/ drivers/block/zram/ drivers/char/hw_random/ drivers/char/ipmi/ drivers/crypto/amlogic/ drivers/devfreq/ drivers/fpga/ drivers/hwtracing/stm/ drivers/input/ drivers/media/v4l2-core/ drivers/misc/ drivers/mux/ drivers/pps/ drivers/rapidio/ drivers/s390/char/ drivers/slimbus/ drivers/vfio/mdev/ drivers/w1/slaves/ drivers/watchdog/ fs/btrfs/ fs/cachefiles/ fs/ecryptfs/ fs/f2fs/ fs/pstore/ kernel/locking/ kernel/rcu/ lib/