[ammarfaizi2-block:google/android/kernel/common/android12-5.10-2022-03 199/9999] arch/arm64/kvm/perf.c:58:36: error: implicit declaration of function 'perf_num_counters'

From: kernel test robot
Date: Fri Apr 01 2022 - 23:47:45 EST

Hi Marc,

FYI, the error/warning still remains.

tree: https://github.com/ammarfaizi2/linux-block google/android/kernel/common/android12-5.10-2022-03
head: 64099431c232d4a95f621411747a3972cc1c8061
commit: 13dbdc0759fd4b89417f64d399ffa6a86fdc7caf [199/9999] FROMGIT: KVM: arm64: Turn kvm_arm_support_pmu_v3() into a static key
config: arm64-randconfig-r024-20220331 (https://download.01.org/0day-ci/archive/20220402/202204021112.ErKMELRr-lkp@xxxxxxxxx/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project cc2e2b80a1f36a28fa7c96c38c2674b10868f09f)
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 arm64 cross compiling tool for clang build
# apt-get install binutils-aarch64-linux-gnu
# https://github.com/ammarfaizi2/linux-block/commit/13dbdc0759fd4b89417f64d399ffa6a86fdc7caf
git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
git fetch --no-tags ammarfaizi2-block google/android/kernel/common/android12-5.10-2022-03
git checkout 13dbdc0759fd4b89417f64d399ffa6a86fdc7caf
# save the config file to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash arch/arm64/

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

All errors (new ones prefixed by >>):

>> arch/arm64/kvm/perf.c:58:36: error: implicit declaration of function 'perf_num_counters' [-Werror,-Wimplicit-function-declaration]
if (IS_ENABLED(CONFIG_ARM_PMU) && perf_num_counters() > 0)
1 error generated.

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

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 (IS_ENABLED(CONFIG_ARM_PMU) && perf_num_counters() > 0)
59 static_branch_enable(&kvm_arm_pmu_available);
61 return perf_register_guest_info_callbacks(&kvm_guest_cbs);
62 }

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