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/smfrench/smb3-kernel/commit/d867a30d3782ec84dab9abc3eeca3530a0c05912
        git remote add smfrench-smb3 https://github.com/smfrench/smb3-kernel.git
        git fetch --no-tags smfrench-smb3 6.5-full-backport
        git checkout d867a30d3782ec84dab9abc3eeca3530a0c05912
        # 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 fs/smb/client/