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/qcom/linux.git/commit/?id=21b5d5a4a3114607a27653371c0332f2080e3c05
        git remote add qcom https://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux
        git fetch --no-tags qcom clk-for-6.13
        git checkout 21b5d5a4a3114607a27653371c0332f2080e3c05
        # 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/clk/qcom/