reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=18ec6c5d7ec6c73ccff616041d75b6ea30a9a36e
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 18ec6c5d7ec6c73ccff616041d75b6ea30a9a36e

        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=$HOME/0day COMPILER=gcc-8.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=s390 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-8.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash drivers/dma/ drivers/md/ drivers/nvdimm/ drivers/scsi/bnx2fc/ drivers/scsi/fcoe/ drivers/scsi/libfc/ drivers/target/ fs/nfsd/ kernel/events/ kernel/futex/ kernel/trace/ net/can/ net/ipv4/ net/ipv6/ net/l2tp/ net/packet/ net/sctp/ net/smc/ net/sunrpc/