tree: https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git modules/WIP head: f5c11619431a2710b5d96883d3aeff708b7e8557 commit: b07aec8a443f228fe79cd4dbeae1c69ab406336e [22/23] ftrace: Merge ftrace_module_{init,enable}() config: x86_64-rhel (attached as .config) compiler: gcc-9 (Debian 9.3.0-13) 9.3.0 reproduce (this is a W=1 build): git checkout b07aec8a443f228fe79cd4dbeae1c69ab406336e # save the attached .config to linux build tree make W=1 ARCH=x86_64 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 >>, old ones prefixed by <<): ld: kernel/module.o: in function `__do_sys_delete_module': kernel/module.c:1036: undefined reference to `ftrace_module_release' ld: kernel/module.o: in function `do_init_module': kernel/module.c:3648: undefined reference to `ftrace_module_release' ld: kernel/module.o: in function `load_module': kernel/module.c:3943: undefined reference to `ftrace_module_release' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org