Hi Wang, FYI, the error/warning still remains. tree: https://gitee.com/openeuler/kernel.git OLK-5.10 head: 26e6aab08db562ec2a74b2125bddcc9a68cb6d5c commit: d60758b0ffcd28339b899dcd5dc7416019a69b53 [3218/3218] net/oenetcls: introduce oenetcls for network optimization config: x86_64-buildonly-randconfig-004-20250926 (https://download.01.org/0day-ci/archive/20250926/202509260246.HUm8BhfP-lkp@i...) compiler: gcc-14 (Debian 14.2.0-19) 14.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250926/202509260246.HUm8BhfP-lkp@i...) 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 <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202509260246.HUm8BhfP-lkp@intel.com/ All warnings (new ones prefixed by >>): In file included from include/trace/define_trace.h:102, from include/trace/hooks/oenetcls.h:41, from drivers/hooks/vendor_hooks.c:12:

...

include/trace/trace_events.h:27:23: warning: 'str__oenetcls__trace_system_name' defined but not used [-Wunused-const-variable=] 27 | #define __app__(x, y) str__##x##y | ^~~~~ include/trace/trace_events.h:28:21: note: in expansion of macro '__app__' 28 | #define __app(x, y) __app__(x, y) | ^~~~~~~ include/trace/trace_events.h:30:29: note: in expansion of macro '__app' 30 | #define TRACE_SYSTEM_STRING __app(TRACE_SYSTEM_VAR,__trace_system_name) | ^~~~~ include/trace/trace_events.h:33:27: note: in expansion of macro 'TRACE_SYSTEM_STRING' 33 | static const char TRACE_SYSTEM_STRING[] = \ | ^~~~~~~~~~~~~~~~~~~ include/trace/trace_events.h:36:1: note: in expansion of macro 'TRACE_MAKE_SYSTEM_STR' 36 | TRACE_MAKE_SYSTEM_STR(); | ^~~~~~~~~~~~~~~~~~~~~

vim +/str__oenetcls__trace_system_name +27 include/trace/trace_events.h acd388fd3af350 include/trace/ftrace.h Steven Rostedt (Red Hat 2015-03-31 26) acd388fd3af350 include/trace/ftrace.h Steven Rostedt (Red Hat 2015-03-31 @27) #define __app__(x, y) str__##x##y acd388fd3af350 include/trace/ftrace.h Steven Rostedt (Red Hat 2015-03-31 28) #define __app(x, y) __app__(x, y) acd388fd3af350 include/trace/ftrace.h Steven Rostedt (Red Hat 2015-03-31 29) :::::: The code at line 27 was first introduced by commit :::::: acd388fd3af350ab24c6ab6f19b83fc4a4f3aa60 tracing: Give system name a pointer :::::: TO: Steven Rostedt (Red Hat) <rostedt@goodmis.org> :::::: CC: Steven Rostedt <rostedt@goodmis.org> -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki