Re: [PATCH RFV v2 08/13] perf/core: Add new function perf_event_topdown_metrics()

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

Hi Dapeng,

kernel test robot noticed the following build warnings:

[auto build test WARNING on next-20230808]
[cannot apply to kvm/queue acme/perf/core tip/perf/core kvm/linux-next v6.5-rc5 v6.5-rc4 v6.5-rc3 linus/master v6.5-rc5]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Dapeng-Mi/KVM-x86-pmu-Support-PMU-fixed-counter-3/20230809-030457
base:   next-20230808
patch link:    https://lore.kernel.org/r/20230808063111.1870070-9-dapeng1.mi%40linux.intel.com
patch subject: [PATCH RFV v2 08/13] perf/core: Add new function perf_event_topdown_metrics()
config: loongarch-allnoconfig (https://download.01.org/0day-ci/archive/20230809/202308090447.HY139um6-lkp@intel.com/config)
compiler: loongarch64-linux-gcc (GCC) 12.3.0
reproduce: (https://download.01.org/0day-ci/archive/20230809/202308090447.HY139um6-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/202308090447.HY139um6-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/trace_events.h:10,
                    from include/trace/syscall.h:7,
                    from include/linux/syscalls.h:90,
                    from arch/loongarch/mm/cache.c:17:
>> include/linux/perf_event.h:1793:53: warning: 'struct td_metrics' declared inside parameter list will not be visible outside of this definition or declaration
    1793 |                                              struct td_metrics *value)
         |                                                     ^~~~~~~~~~
--
   In file included from include/linux/trace_events.h:10,
                    from include/trace/syscall.h:7,
                    from include/linux/syscalls.h:90,
                    from include/linux/entry-common.h:7,
                    from arch/loongarch/mm/fault.c:13:
>> include/linux/perf_event.h:1793:53: warning: 'struct td_metrics' declared inside parameter list will not be visible outside of this definition or declaration
    1793 |                                              struct td_metrics *value)
         |                                                     ^~~~~~~~~~
   arch/loongarch/mm/fault.c:256:27: warning: no previous prototype for 'do_page_fault' [-Wmissing-prototypes]
     256 | asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
         |                           ^~~~~~~~~~~~~


vim +1793 include/linux/perf_event.h

  1791	
  1792	static inline int perf_event_topdown_metrics(struct perf_event *event,
> 1793						     struct td_metrics *value)
  1794	{
  1795		return 0;
  1796	}
  1797	#endif
  1798	

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