linux-kernel - include/trace/stages/init.h:2:23: warning: 'str__irq_vectors__trace_system

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Date: Thu, 11 Jan 2024 01:20:18 +0800
From: kernel test robot <lkp@...el.com>
To: "Steven Rostedt (Google)" <rostedt@...dmis.org>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: include/trace/stages/init.h:2:23: warning:
 'str__irq_vectors__trace_system_name' defined but not used

Hi Steven,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   ab27740f76654ed58dd32ac0ba0031c18a6dea3b
commit: af6b9668e85ffd1502aada8036ccbf4dbd481708 tracing: Move the defines to create TRACE_EVENTS into their own files
date:   1 year, 10 months ago
config: i386-buildonly-randconfig-003-20240106 (https://download.01.org/0day-ci/archive/20240111/202401110124.FXHxWlN9-lkp@intel.com/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240111/202401110124.FXHxWlN9-lkp@intel.com/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 <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202401110124.FXHxWlN9-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/trace/trace_events.h:27,
                    from include/trace/define_trace.h:102,
                    from arch/x86/include/asm/trace/irq_vectors.h:383,
                    from arch/x86/kernel/irq.c:27:
>> include/trace/stages/init.h:2:23: warning: 'str__irq_vectors__trace_system_name' defined but not used [-Wunused-const-variable=]
       2 | #define __app__(x, y) str__##x##y
         |                       ^~~~~
   include/trace/stages/init.h:3:21: note: in expansion of macro '__app__'
       3 | #define __app(x, y) __app__(x, y)
         |                     ^~~~~~~
   include/trace/stages/init.h:5:29: note: in expansion of macro '__app'
       5 | #define TRACE_SYSTEM_STRING __app(TRACE_SYSTEM_VAR,__trace_system_name)
         |                             ^~~~~
   include/trace/stages/init.h:8:20: note: in expansion of macro 'TRACE_SYSTEM_STRING'
       8 |  static const char TRACE_SYSTEM_STRING[] = \
         |                    ^~~~~~~~~~~~~~~~~~~
   include/trace/stages/init.h:11:1: note: in expansion of macro 'TRACE_MAKE_SYSTEM_STR'
      11 | TRACE_MAKE_SYSTEM_STR();
         | ^~~~~~~~~~~~~~~~~~~~~


vim +/str__irq_vectors__trace_system_name +2 include/trace/stages/init.h

   > 2	#define __app__(x, y) str__##x##y
     3	#define __app(x, y) __app__(x, y)
     4	

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https://github.com/intel/lkp-tests/wiki