Hi Heiko,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   dcd68326d29b62f3039e4f4d23d3e38f24d37360
commit: 334ef6ed06fa1a54e35296b77b693bcf6d63ee9e init/Kconfig: make COMPILE_TEST depend on !S390
date:   12 months ago
config: s390-randconfig-r021-20211103 (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/?id=334ef6ed06fa1a54e35296b77b693bcf6d63ee9e
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 334ef6ed06fa1a54e35296b77b693bcf6d63ee9e
        # 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@intel.com>

All errors (new ones prefixed by >>, old ones prefixed by <<):

ERROR: modpost: "devm_ioremap_resource" [drivers/media/rc/ir-hix5hd2.ko] undefined!
ERROR: modpost: "ioremap" [drivers/pcmcia/pcmcia.ko] undefined!
ERROR: modpost: "iounmap" [drivers/pcmcia/pcmcia.ko] undefined!
>> ERROR: modpost: "devm_platform_ioremap_resource" [drivers/char/xillybus/xillybus_of.ko] undefined!
ERROR: modpost: "devm_ioremap_resource" [drivers/dma/idma64.ko] undefined!
ERROR: modpost: "devm_ioremap_resource" [drivers/dma/fsl-edma.ko] undefined!
ERROR: modpost: "devm_ioremap_resource" [drivers/dma/qcom/hdma.ko] undefined!

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0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org