Hi Alexander, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: c8c109546a19613d323a319d0c921cb1f317e629 commit: ef019c5daf032dce0b95ed4d45bfec93c4fbcb9f PHY: Ingenic: fix unconditional build of phy-ingenic-usb date: 11 months ago config: s390-randconfig-m031-20211113 (attached as .config) compiler: s390-linux-gcc (GCC) 11.2.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout ef019c5daf032dce0b95ed4d45bfec93c4fbcb9f # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=s390 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>, old ones prefixed by <<): ERROR: modpost: "ioremap" [drivers/pcmcia/pcmcia.ko] undefined! ERROR: modpost: "iounmap" [drivers/pcmcia/pcmcia.ko] undefined! ERROR: modpost: "iounmap" [drivers/net/arcnet/arc-rimi.ko] undefined! ERROR: modpost: "ioremap" [drivers/net/arcnet/arc-rimi.ko] undefined! ERROR: modpost: "iounmap" [drivers/net/arcnet/com90xx.ko] undefined! ERROR: modpost: "ioremap" [drivers/net/arcnet/com90xx.ko] undefined! ERROR: modpost: "devm_ioremap" [drivers/net/ethernet/altera/altera_tse.ko] undefined! --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org