[arm-platforms:kvm-arm64/pmu-undef-NV 1/3] arch/arm64/kvm/perf.c:58:6: error: implicit declaration of function 'perf_num_counters'; did you mean

[arm-platforms:kvm-arm64/pmu-undef-NV 1/3] arch/arm64/kvm/perf.c:58:6: error: implicit declaration of function 'perf_num_counters'; did you mean

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git kvm-arm64/pmu-undef-NV
head:   5893d9ecf13a260bf087d01ba16fdaad72261c61
commit: 7e2acc92692ec8d98a6c08f80d5d0c66c8c590fd [1/3] KVM: arm64: Turn kvm_arm_support_pmu_v3() into a static key
config: arm64-randconfig-r024-20210202 (attached as .config)
compiler: aarch64-linux-gcc (GCC) 9.3.0
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/maz/arm-platforms.git/commit/?id=7e2acc92692ec8d98a6c08f80d5d0c66c8c590fd
        git remote add arm-platforms https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git
        git fetch --no-tags arm-platforms kvm-arm64/pmu-undef-NV
        git checkout 7e2acc92692ec8d98a6c08f80d5d0c66c8c590fd
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 

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

All errors (new ones prefixed by >>):

   arch/arm64/kvm/perf.c: In function 'kvm_perf_init':
>> arch/arm64/kvm/perf.c:58:6: error: implicit declaration of function 'perf_num_counters'; did you mean 'dec_mm_counter'? [-Werror=implicit-function-declaration]
      58 |  if (perf_num_counters() > 0)
         |      ^~~~~~~~~~~~~~~~~
         |      dec_mm_counter
   cc1: some warnings being treated as errors


vim +58 arch/arm64/kvm/perf.c

    50	
    51	int kvm_perf_init(void)
    52	{
    53		/*
    54		 * Check if HW_PERF_EVENTS are supported by checking the number of
    55		 * hardware performance counters. This could ensure the presence of
    56		 * a physical PMU and CONFIG_PERF_EVENT is selected.
    57		 */
  > 58		if (perf_num_counters() > 0)
    59			static_branch_enable(&kvm_arm_pmu_available);
    60	
    61		return perf_register_guest_info_callbacks(&kvm_guest_cbs);
    62	}
    63	

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

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