[trace:trace/urgent 13/13] kernel/trace/trace_events.c:158:5: warning: no previous prototype for 'trace_define_field_ext'

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

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace trace/urgent
head:   b6c7abd1c28a63ad633433d037ee15a1bc3023ba
commit: b6c7abd1c28a63ad633433d037ee15a1bc3023ba [13/13] tracing: Fix TASK_COMM_LEN in trace event format file
config: sh-allmodconfig (https://download.01.org/0day-ci/archive/20230213/202302130750.679RaRog-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace.git/commit/?id=b6c7abd1c28a63ad633433d037ee15a1bc3023ba
        git remote add trace git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
        git fetch --no-tags trace trace/urgent
        git checkout b6c7abd1c28a63ad633433d037ee15a1bc3023ba
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=sh olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=sh SHELL=/bin/bash kernel/trace/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202302130750.679RaRog-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> kernel/trace/trace_events.c:158:5: warning: no previous prototype for 'trace_define_field_ext' [-Wmissing-prototypes]
     158 | int trace_define_field_ext(struct trace_event_call *call, const char *type,
         |     ^~~~~~~~~~~~~~~~~~~~~~


vim +/trace_define_field_ext +158 kernel/trace/trace_events.c

   157	
 > 158	int trace_define_field_ext(struct trace_event_call *call, const char *type,
   159			       const char *name, int offset, int size, int is_signed,
   160			       int filter_type, int len)
   161	{
   162		struct list_head *head;
   163	
   164		if (WARN_ON(!call->class))
   165			return 0;
   166	
   167		head = trace_get_fields(call);
   168		return __trace_define_field(head, type, name, offset, size,
   169					    is_signed, filter_type, len);
   170	}
   171	

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