tree: https://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git ftrace/fgraph-multi head: 978dc256bd4d08df876d58b4fa01ba4cb3926242 commit: 0f2f776e0e938471ac0edd75576b5b5a77603750 [32/40] ftrace: Allow function_graph tracer to be enabled in instances config: i386-randconfig-r035-20210416 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git/c... git remote add trace https://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git git fetch --no-tags trace ftrace/fgraph-multi git checkout 0f2f776e0e938471ac0edd75576b5b5a77603750 # save the attached .config to linux build tree make W=1 W=1 ARCH=i386 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 >>): kernel/trace/trace_functions.c: In function 'ftrace_create_function_files': 78 | ret = allocate_fgraph_ops(tr); | ^~~ | net kernel/trace/trace_functions.c:78:2: note: each undeclared identifier is reported only once for each function it appears in vim +78 kernel/trace/trace_functions.c 64 65 int ftrace_create_function_files(struct trace_array *tr, 66 struct dentry *parent) 67 { 68 /* 69 * The top level array uses the "global_ops", and the files are 70 * created on boot up. 71 */ 72 if (tr->flags & TRACE_ARRAY_FL_GLOBAL) 73 return 0; 74 75 if (!tr->ops) 76 return -EINVAL; 77 79 if (ret) { 80 kfree(tr->ops); 81 return ret; 82 } 83 84 ftrace_create_filter_files(tr->ops, parent); 85 86 return 0; 87 } 88 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org