Re: [PATCH v2] x86/perf: Use static_call for x86_pmu.guest_get_msrs

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

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Hi Like,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on tip/perf/core]
[also build test WARNING on tip/master v5.11-rc4 next-20210121]
[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]

url:    https://github.com/0day-ci/linux/commits/Like-Xu/x86-perf-Use-static_call-for-x86_pmu-guest_get_msrs/20210122-112838
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 9a7832ce3d920426a36cdd78eda4b3568d4d09e3
config: x86_64-randconfig-a004-20210122 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project bd3a387ee76f58caa0d7901f3f84e9bb3d006f27)
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
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://github.com/0day-ci/linux/commit/8e16a2c508abb30462013fd0782d6dd1bf8aa7e2
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Like-Xu/x86-perf-Use-static_call-for-x86_pmu-guest_get_msrs/20210122-112838
        git checkout 8e16a2c508abb30462013fd0782d6dd1bf8aa7e2
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> arch/x86/events/core.c:670:31: warning: no previous prototype for function 'perf_guest_get_msrs' [-Wmissing-prototypes]
   struct perf_guest_switch_msr *perf_guest_get_msrs(int *nr)
                                 ^
   arch/x86/events/core.c:670:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   struct perf_guest_switch_msr *perf_guest_get_msrs(int *nr)
   ^
   static 
   1 warning generated.


vim +/perf_guest_get_msrs +670 arch/x86/events/core.c

   669	
 > 670	struct perf_guest_switch_msr *perf_guest_get_msrs(int *nr)
   671	{
   672		return static_call(x86_pmu_guest_get_msrs)(nr);
   673	}
   674	EXPORT_SYMBOL_GPL(perf_guest_get_msrs);
   675	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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