linux-kernel - [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

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Message-ID: <202204021112.ErKMELRr-lkp@intel.com>
Date:   Sat, 2 Apr 2022 11:47:04 +0800
From:   kernel test robot <lkp@...el.com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
        linux-kernel@...r.kernel.org, Quentin Perret <qperret@...gle.com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Will Deacon <willdeacon@...gle.com>
Subject: [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'

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@intel.com/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@...el.com>

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

    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 (IS_ENABLED(CONFIG_ARM_PMU) && 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
https://01.org/lkp