I do not have a local compilation environment for s390 (IBM Z) architecture. But I think
it can be fixed by the following patch.
With these kernel test robot mails the bot provides
instructions for reproducing with a cross toolchain from the 0day
project. See the line starting with "reproduce (this is a W=1 build):"
i.e. in this particular case it links the URL:
https://download.01.org/0day-ci/archive/20230920/202309201408.95QRxHEl-lkp@xxxxxxxxx/reproduce