tree:   https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git modules/WIP
head:   6198899924a638c47cd8b7df67a9f30b32dd6c0f
commit: a78c13c458123e985c8dee40116ef67e5ef1e942 [22/23] ftrace: Merge ftrace_module_{init,enable}()
config: s390-defconfig (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
        git checkout a78c13c458123e985c8dee40116ef67e5ef1e942
        # 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@intel.com>

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

s390-linux-ld: kernel/module.o: in function `__s390_sys_delete_module':
>> module.c:(.text+0x4664): undefined reference to `ftrace_module_release'
s390-linux-ld: kernel/module.o: in function `__se_sys_delete_module':
module.c:(.text+0x489c): undefined reference to `ftrace_module_release'
s390-linux-ld: kernel/module.o: in function `do_init_module':
module.c:(.text+0x4b84): undefined reference to `ftrace_module_release'
s390-linux-ld: kernel/module.o: in function `load_module':
module.c:(.text+0x6258): undefined reference to `ftrace_module_release'

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