[trace:trace/core 21/22] include/linux/ftrace.h:47:47: warning: declaration of 'struct fgraph_ret_regs' will not be visible outside of this function

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

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace trace/core
head:   46b77ea28faeed56f1d1b63f9049c40b9eb3cbf5
commit: 55803539764e831c4e642de1c6634f8f645a10aa [21/22] tracing: arm64: Avoid missing-prototype warnings
config: i386-randconfig-i012-20230710 (https://download.01.org/0day-ci/archive/20230712/202307120418.wmSazUy7-lkp@intel.com/config)
compiler: clang version 15.0.7 (https://github.com/llvm/llvm-project.git 8dfdcc7b7bf66834a761bd8de445840ef68e4d1a)
reproduce: (https://download.01.org/0day-ci/archive/20230712/202307120418.wmSazUy7-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/202307120418.wmSazUy7-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from kernel/power/process.c:15:
   In file included from include/linux/syscalls.h:88:
   In file included from include/trace/syscall.h:7:
   In file included from include/linux/trace_events.h:10:
   In file included from include/linux/perf_event.h:52:
>> include/linux/ftrace.h:47:47: warning: declaration of 'struct fgraph_ret_regs' will not be visible outside of this function [-Wvisibility]
   unsigned long ftrace_return_to_handler(struct fgraph_ret_regs *ret_regs);
                                                 ^
   1 warning generated.


vim +47 include/linux/ftrace.h

    45	
    46	#ifdef CONFIG_HAVE_FUNCTION_GRAPH_RETVAL
  > 47	unsigned long ftrace_return_to_handler(struct fgraph_ret_regs *ret_regs);
    48	#else
    49	unsigned long ftrace_return_to_handler(unsigned long frame_pointer);
    50	#endif
    51	

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