Re: [PATCH v3 -next 2/5] spi: mockup: Add writeable tracepoint for spi transfer

[kernel test robot <lkp@intel.com>]

Hi Zhang,

kernel test robot noticed the following build warnings:

[auto build test WARNING on next-20231103]

url:    https://github.com/intel-lab-lkp/linux/commits/Zhang-Xiaoxu/spi-mockup-Add-SPI-controller-testing-driver/20231104-144859
base:   next-20231103
patch link:    https://lore.kernel.org/r/20231104064650.972687-3-zhangxiaoxu%40huaweicloud.com
patch subject: [PATCH v3 -next 2/5] spi: mockup: Add writeable tracepoint for spi transfer
config: mips-allyesconfig (https://download.01.org/0day-ci/archive/20231104/202311041825.n8iCJiNe-lkp@intel.com/config)
compiler: mips-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231104/202311041825.n8iCJiNe-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311041825.n8iCJiNe-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 include/trace/events/spi_mockup.h:31,
                    from drivers/spi/spi-mockup.c:17:
>> include/trace/stages/init.h:2:23: warning: 'str__spi_mockup__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__spi_mockup__trace_system_name +2 include/trace/stages/init.h

af6b9668e85ffd Steven Rostedt (Google  2022-03-03 @2) #define __app__(x, y) str__##x##y
af6b9668e85ffd Steven Rostedt (Google  2022-03-03  3) #define __app(x, y) __app__(x, y)
af6b9668e85ffd Steven Rostedt (Google  2022-03-03  4) 

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