Hi Jonathan, [FYI, it's a private test report for your RFC patch.] [auto build test ERROR on net/master] [also build test ERROR on linus/master v5.8-rc1 next-20200618] [cannot apply to char-misc/char-misc-testing net-next/master ipvs/master] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Jonathan-Lemon/netgpu-networking... base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git ef7232da6bcd4294cbb2d424bc35885721570f01 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/iov_iter.o: in function `iov_iter_sk_get_pages': iov_iter.c:(.text+0x33fa): undefined reference to `fn_netgpu_get_pages' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org