tree: https://git.kernel.org/pub/scm/linux/kernel/git/krisman/unicode.git for-next head: cfeb007a96b15cafe1b8cc7aa8d43da77a97b7ae commit: d269543a1dcb29d198f1e8f0dd0a249a563bc2ee [1/2] unicode: implement utf8 unit tests as a KUnit test suite. config: s390-allmodconfig (attached as .config) compiler: s390-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout d269543a1dcb29d198f1e8f0dd0a249a563bc2ee # 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: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>, old ones prefixed by <<): s390-linux-ld: fs/unicode/utf8-test.o: in function `kunit_test_suites_init': utf8-test.c:(.text+0x30): undefined reference to `__kunit_test_suites_init' s390-linux-ld: fs/unicode/utf8-test.o: in function `utf8_test_comparisons': utf8-test.c:(.text+0xf8): undefined reference to `kunit_ptr_not_err_assert_format' s390-linux-ld: utf8-test.c:(.text+0x2fa): undefined reference to `kunit_do_assertion' s390-linux-ld: utf8-test.c:(.text+0x442): undefined reference to `kunit_do_assertion' s390-linux-ld: fs/unicode/utf8-test.o: in function `utf8_test_nfdicf': utf8-test.c:(.text+0x560): undefined reference to `kunit_ptr_not_err_assert_format' s390-linux-ld: utf8-test.c:(.text+0x606): undefined reference to `kunit_do_assertion' s390-linux-ld: utf8-test.c:(.text+0x60c): undefined reference to `kunit_binary_assert_format' s390-linux-ld: utf8-test.c:(.text+0x706): undefined reference to `kunit_do_assertion' s390-linux-ld: utf8-test.c:(.text+0x7cc): undefined reference to `kunit_do_assertion' s390-linux-ld: utf8-test.c:(.text+0x88a): undefined reference to `kunit_do_assertion' s390-linux-ld: utf8-test.c:(.text+0x99c): undefined reference to `kunit_do_assertion' s390-linux-ld: utf8-test.c:(.text+0xa80): undefined reference to `kunit_do_assertion' s390-linux-ld: fs/unicode/utf8-test.o: in function `utf8_test_nfdi': utf8-test.c:(.text+0xbc8): undefined reference to `kunit_ptr_not_err_assert_format' s390-linux-ld: utf8-test.c:(.text+0xc6e): undefined reference to `kunit_do_assertion' s390-linux-ld: utf8-test.c:(.text+0xc74): undefined reference to `kunit_binary_assert_format' s390-linux-ld: utf8-test.c:(.text+0xd6e): undefined reference to `kunit_do_assertion' s390-linux-ld: utf8-test.c:(.text+0xe34): undefined reference to `kunit_do_assertion' s390-linux-ld: utf8-test.c:(.text+0xef2): undefined reference to `kunit_do_assertion' s390-linux-ld: utf8-test.c:(.text+0x1004): undefined reference to `kunit_do_assertion' s390-linux-ld: utf8-test.c:(.text+0x10e8): undefined reference to `kunit_do_assertion' s390-linux-ld: fs/unicode/utf8-test.o: in function `utf8_test_supported_versions': utf8-test.c:(.text+0x1216): undefined reference to `kunit_unary_assert_format' s390-linux-ld: utf8-test.c:(.text+0x1266): undefined reference to `kunit_do_assertion' s390-linux-ld: utf8-test.c:(.text+0x12e4): undefined reference to `kunit_do_assertion' s390-linux-ld: utf8-test.c:(.text+0x1362): undefined reference to `kunit_do_assertion' s390-linux-ld: utf8-test.c:(.text+0x13e4): undefined reference to `kunit_do_assertion' s390-linux-ld: utf8-test.c:(.text+0x1466): undefined reference to `kunit_do_assertion' s390-linux-ld: fs/unicode/utf8-test.o:utf8-test.c:(.text+0x14e8): more undefined references to `kunit_do_assertion' follow s390-linux-ld: fs/unicode/utf8-test.o: in function `kunit_test_suites_exit': utf8-test.c:(.exit.text+0x2a): undefined reference to `__kunit_test_suites_exit' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org