reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/620a5e651a016fb89fe1738e2f63a1e8521ece1e
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Anthony-Krowiak/s390-vfio-ap-Fix-leaks-of-pinned-NIB-and-registered-GISC/20260929-081832
        git checkout 620a5e651a016fb89fe1738e2f63a1e8521ece1e

        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=$HOME/0day COMPILER=gcc-9.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=s390 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash drivers/s390/crypto/