[trace:trace/core 21/22] include/linux/ftrace.h:47:47: warning: 'struct fgraph_ret_regs' declared inside parameter list will not be visible outside of this definition or declaration

[trace:trace/core 21/22] include/linux/ftrace.h:47:47: warning: 'struct fgraph_ret_regs' declared inside parameter list will not be visible outside of this definition or declaration

[kernel test robot]

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-defconfig (https://download.01.org/0day-ci/archive/20230712/202307120334.Fn8EEmph-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce: (https://download.01.org/0day-ci/archive/20230712/202307120334.Fn8EEmph-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/202307120334.Fn8EEmph-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/perf_event.h:52,
                    from include/linux/trace_events.h:10,
                    from include/trace/syscall.h:7,
                    from include/linux/syscalls.h:88,
                    from arch/x86/entry/syscall_32.c:7:
>> include/linux/ftrace.h:47:47: warning: 'struct fgraph_ret_regs' declared inside parameter list will not be visible outside of this definition or declaration
      47 | unsigned long ftrace_return_to_handler(struct fgraph_ret_regs *ret_regs);
         |                                               ^~~~~~~~~~~~~~~
--
   In file included from include/linux/perf_event.h:52,
                    from include/linux/trace_events.h:10,
                    from include/trace/syscall.h:7,
                    from include/linux/syscalls.h:88,
                    from include/linux/entry-common.h:7,
                    from arch/x86/entry/common.c:13:
>> include/linux/ftrace.h:47:47: warning: 'struct fgraph_ret_regs' declared inside parameter list will not be visible outside of this definition or declaration
      47 | unsigned long ftrace_return_to_handler(struct fgraph_ret_regs *ret_regs);
         |                                               ^~~~~~~~~~~~~~~
   arch/x86/entry/common.c:119:24: warning: no previous prototype for 'do_int80_syscall_32' [-Wmissing-prototypes]
     119 | __visible noinstr void do_int80_syscall_32(struct pt_regs *regs)
         |                        ^~~~~~~~~~~~~~~~~~~
   arch/x86/entry/common.c:186:24: warning: no previous prototype for 'do_fast_syscall_32' [-Wmissing-prototypes]
     186 | __visible noinstr long do_fast_syscall_32(struct pt_regs *regs)
         |                        ^~~~~~~~~~~~~~~~~~
   arch/x86/entry/common.c:238:24: warning: no previous prototype for 'do_SYSENTER_32' [-Wmissing-prototypes]
     238 | __visible noinstr long do_SYSENTER_32(struct pt_regs *regs)
         |                        ^~~~~~~~~~~~~~


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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