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/Freescale/linux-fslc/commit/c899829bffffaf0b645ec5d7194aaceb500f8ce9
        git remote add freescale-fslc https://github.com/Freescale/linux-fslc
        git fetch --no-tags freescale-fslc 5.15-2.2.x-imx
        git checkout c899829bffffaf0b645ec5d7194aaceb500f8ce9
        # 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 arch/s390/kernel/ drivers/firmware/imx/ drivers/gpu/drm/imx/ drivers/iio/imu/ drivers/input/touchscreen/ drivers/irqchip/ drivers/media/platform/ drivers/net/ethernet/freescale/enetc/ drivers/net/phy/ drivers/pci/controller/mobiveil/ drivers/soc/imx/ drivers/staging/ drivers/video/fbdev/ net/ sound/soc/sof/