Hi Donglin, kernel test robot noticed the following build warnings:
[auto build test WARNING on v6.18-rc5] [also build test WARNING on linus/master] [cannot apply to trace/for-next next-20251113] [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#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Donglin-Peng/function_graph-Enable-funcgraph-args-and-funcgraph-retaddr-to-work-simultaneously/20251113-153332 base: v6.18-rc5 patch link: https://lore.kernel.org/r/20251113072938.333657-1-dolinux.peng%40gmail.com patch subject: [PATCH v5] function_graph: Enable funcgraph-args and funcgraph-retaddr to work simultaneously config: x86_64-kexec (https://download.01.org/0day-ci/archive/20251114/[email protected]/config) compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251114/[email protected]/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <[email protected]> | Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/ All warnings (new ones prefixed by >>): >> kernel/trace/trace_functions_graph.c:169:20: warning: variable 'retaddr' is >> uninitialized when used here [-Wuninitialized] 169 | entry->args[0] = retaddr; | ^~~~~~~ kernel/trace/trace_functions_graph.c:143:23: note: initialize the variable 'retaddr' to silence this warning 143 | unsigned long retaddr; | ^ | = 0 1 warning generated. vim +/retaddr +169 kernel/trace/trace_functions_graph.c 132 133 static void 134 print_graph_duration(struct trace_array *tr, unsigned long long duration, 135 struct trace_seq *s, u32 flags); 136 137 static int __graph_entry(struct trace_array *tr, struct ftrace_graph_ent *trace, 138 unsigned int trace_ctx, struct ftrace_regs *fregs) 139 { 140 struct ring_buffer_event *event; 141 struct trace_buffer *buffer = tr->array_buffer.buffer; 142 struct ftrace_graph_ent_entry *entry; 143 unsigned long retaddr; 144 int size = sizeof(*entry); 145 int type = TRACE_GRAPH_ENT; 146 int nr_args = 0, args_offs = 0; 147 148 if (IS_ENABLED(CONFIG_FUNCTION_GRAPH_RETADDR) && 149 tracer_flags_is_set(TRACE_GRAPH_PRINT_RETADDR)) { 150 retaddr = ftrace_graph_top_ret_addr(current); 151 type = TRACE_GRAPH_RETADDR_ENT; 152 nr_args += 1; 153 } 154 155 /* If fregs is defined, add FTRACE_REGS_MAX_ARGS long size words */ 156 if (!!fregs) 157 nr_args += FTRACE_REGS_MAX_ARGS; 158 159 size += nr_args * sizeof(long); 160 event = trace_buffer_lock_reserve(buffer, type, size, trace_ctx); 161 if (!event) 162 return 0; 163 164 entry = ring_buffer_event_data(event); 165 entry->graph_ent = *trace; 166 167 /* Store the retaddr in args[0] */ 168 if (type == TRACE_GRAPH_RETADDR_ENT) { > 169 entry->args[0] = retaddr; 170 args_offs += 1; 171 } 172 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
