Hi Johannes, kernel test robot noticed the following build warnings:
[auto build test WARNING on mcgrof/modules-next] [also build test WARNING on arnd-asm-generic/master tip/timers/core net/main net-next/main linus/master horms-ipvs/master v6.10-rc2 next-20240607] [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/Johannes-Berg/tracing-add-__print_sym-to-replace-__print_symbolic/20240608-000918 base: https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux.git modules-next patch link: https://lore.kernel.org/r/20240607160527.23624-7-johannes%40sipsolutions.net patch subject: [PATCH v4 1/4] tracing: add __print_sym() to replace __print_symbolic() config: i386-buildonly-randconfig-005-20240608 (https://download.01.org/0day-ci/archive/20240608/[email protected]/config) compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240608/[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_events.c:1583:6: warning: variable 'n_sym_defs' is used >> uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized] 1583 | if ((call->flags & TRACE_EVENT_FL_DYNAMIC) || !call->module) { | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/trace_events.c:1595:18: note: uninitialized use occurs here 1595 | for (i = 0; i < n_sym_defs; i++) { | ^~~~~~~~~~ kernel/trace/trace_events.c:1583:2: note: remove the 'if' if its condition is always true 1583 | if ((call->flags & TRACE_EVENT_FL_DYNAMIC) || !call->module) { | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/trace_events.c:1581:25: note: initialize the variable 'n_sym_defs' to silence this warning 1581 | unsigned int n_sym_defs, i; | ^ | = 0 1 warning generated. vim +1583 kernel/trace/trace_events.c 1575 1576 /* note: @name is not NUL-terminated */ 1577 static void show_sym_list(struct seq_file *m, struct trace_event_call *call, 1578 const char *name, unsigned int name_len) 1579 { 1580 struct trace_sym_def **sym_defs; 1581 unsigned int n_sym_defs, i; 1582 > 1583 if ((call->flags & TRACE_EVENT_FL_DYNAMIC) || !call->module) { 1584 sym_defs = __start_ftrace_sym_defs; 1585 n_sym_defs = __stop_ftrace_sym_defs - __start_ftrace_sym_defs; 1586 #ifdef CONFIG_MODULES 1587 } else { 1588 struct module *mod = call->module; 1589 1590 sym_defs = mod->trace_sym_defs; 1591 n_sym_defs = mod->num_trace_sym_defs; 1592 #endif /* CONFIG_MODULES */ 1593 } 1594 1595 for (i = 0; i < n_sym_defs; i++) { 1596 unsigned int sym_len; 1597 1598 if (!sym_defs[i]) 1599 continue; 1600 if (sym_defs[i]->system != call->class->system) 1601 continue; 1602 sym_len = strlen(sym_defs[i]->symbol_id); 1603 if (name_len != sym_len) 1604 continue; 1605 if (strncmp(sym_defs[i]->symbol_id, name, sym_len)) 1606 continue; 1607 if (sym_defs[i]->show) 1608 sym_defs[i]->show(m); 1609 break; 1610 } 1611 } 1612 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
