Hi David, [FYI, it's a private test report for your RFC patch.] [auto build test ERROR on driver-core/driver-core-testing] [also build test ERROR on linux/master linus/master v5.8-rc6 next-20200722] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/David-Gow/platform-ioremap-Build... base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git 6bdb486c5a628f7a927c2658166e3a5ef1f883e7 config: s390-allnoconfig (attached as .config) compiler: s390-linux-gcc (GCC) 9.3.0 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 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 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 >>): s390-linux-ld: lib/devres.o: in function `devm_ioremap_release': s390-linux-ld: lib/devres.o: in function `__devm_ioremap': s390-linux-ld: lib/devres.o: in function `devm_iounmap': devres.c:(.text+0x284): undefined reference to `iounmap' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org