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

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Date:   Tue, 10 May 2022 02:09:01 +0800
From:   kernel test robot <lkp@...el.com>
To:     "Steven Rostedt (Google)" <rostedt@...dmis.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: include/trace/stages/init.h:2:23: warning:
 'str__irq_vectors__trace_system_name' defined but not used

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   9be9ed2612b5aedb52a2c240edb1630b6b743cb6
commit: af6b9668e85ffd1502aada8036ccbf4dbd481708 tracing: Move the defines to create TRACE_EVENTS into their own files
date:   8 weeks ago
config: i386-randconfig-s002-20220509 (https://download.01.org/0day-ci/archive/20220510/202205100242.TCazrhkS-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.2.0-20) 11.2.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=af6b9668e85ffd1502aada8036ccbf4dbd481708
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout af6b9668e85ffd1502aada8036ccbf4dbd481708
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 SHELL=/bin/bash arch/x86/kernel/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.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:8:27: 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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