linux-kernel - Re: [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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Date:   Sat, 02 Apr 2022 10:38:21 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     kernel test robot <lkp@...el.com>
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: Re: [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 Robot,

On Sat, 02 Apr 2022 04:47:04 +0100,
kernel test robot <lkp@...el.com> wrote:
> 
> Hi Marc,
> 
> FYI, the error/warning still remains.
> 
> tree:   https://github.com/ammarfaizi2/linux-block google/android/kernel/common/android12-5.10-2022-03

Oh look, a random Android tree based on ... 5.10.

> 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.

$ ls -l arch/arm64/kvm/perf.c
ls: cannot access 'arch/arm64/kvm/perf.c': No such file or directory

What is the point of testing trees that have no resemblance with
upstream?

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.