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://github.com/weiny2/linux-kernel/commit/58493e004c58388f618fa6b193eb9f1acdf24009
        git remote add weiny2 https://github.com/weiny2/linux-kernel.git
        git fetch --no-tags weiny2 dcd-v4-2024-10-29
        git checkout 58493e004c58388f618fa6b193eb9f1acdf24009
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-20 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=s390 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-20 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash drivers/cxl/ net/ipv4/