Hi Daniel, [FYI, it's a private test report for your RFC patch.] [auto build test ERROR on tip/perf/core] [also build test ERROR on linux/master linus/master v5.12-rc6] [cannot apply to trace/for-next next-20210408] [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/Daniel-Bristot-de-Oliveira/hwlat... base: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git cface0326a6c2ae5c8f47bd466f07624b3e348a7 config: s390-randconfig-c023-20210408 (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 # https://github.com/0day-ci/linux/commit/8fc23c7171dc536d3ce8c17fb66cfe6fc... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Daniel-Bristot-de-Oliveira/hwlat-improvements-and-osnoise-tracer/20210408-221655 git checkout 8fc23c7171dc536d3ce8c17fb66cfe6fcdbc5fb6 # 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: arch/s390/appldata/appldata_base.o: in function `appldata_generic_handler': appldata_base.c:(.text+0x1d0): undefined reference to `sysctl_vals' s390-linux-ld: kernel/trace/trace.o: in function `__update_max_tr': trace.c:(.text+0x6c0e): undefined reference to `latency_fsnotify' s390-linux-ld: kernel/trace/trace_hwlat.o: in function `kthread_fn': --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org