reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/dakr/linux.git/commit/?id=7144511c6614967b4c16b716a9674b12c4e7f2b9
        git remote add dakr https://git.kernel.org/pub/scm/linux/kernel/git/dakr/linux.git
        git fetch --no-tags dakr driver_override
        git checkout 7144511c6614967b4c16b716a9674b12c4e7f2b9

        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=$HOME/0day COMPILER=gcc-15.2.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=s390 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-15.2.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash