linux-kernel - Re: [PATCH v6 08/19] KVM: arm64: Define access helpers for PMUSERENR and PMSELR

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Message-ID: <aYrAMRRwGwCuRONi@rli9-mobl>
Date: Tue, 10 Feb 2026 13:20:49 +0800
From: kernel test robot <lkp@...el.com>
To: Colton Lewis <coltonlewis@...gle.com>, <kvm@...r.kernel.org>
CC: <oe-kbuild-all@...ts.linux.dev>, Alexandru Elisei
	<alexandru.elisei@....com>, Paolo Bonzini <pbonzini@...hat.com>, "Jonathan
 Corbet" <corbet@....net>, Russell King <linux@...linux.org.uk>, "Catalin
 Marinas" <catalin.marinas@....com>, Will Deacon <will@...nel.org>, "Marc
 Zyngier" <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>, "Mingwei
 Zhang" <mizhang@...gle.com>, Joey Gouly <joey.gouly@....com>, Suzuki K
 Poulose <suzuki.poulose@....com>, Zenghui Yu <yuzenghui@...wei.com>, Mark
 Rutland <mark.rutland@....com>, Shuah Khan <skhan@...uxfoundation.org>,
	"Ganapatrao Kulkarni" <gankulkarni@...amperecomputing.com>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <kvmarm@...ts.linux.dev>,
	<linux-perf-users@...r.kernel.org>, <linux-kselftest@...r.kernel.org>, Colton
 Lewis <coltonlewis@...gle.com>
Subject: Re: [PATCH v6 08/19] KVM: arm64: Define access helpers for PMUSERENR
 and PMSELR

Hi Colton,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 63804fed149a6750ffd28610c5c1c98cce6bd377]

url:    https://github.com/intel-lab-lkp/linux/commits/Colton-Lewis/arm64-cpufeature-Add-cpucap-for-HPMN0/20260210-064939
base:   63804fed149a6750ffd28610c5c1c98cce6bd377
patch link:    https://lore.kernel.org/r/20260209221414.2169465-9-coltonlewis%40google.com
patch subject: [PATCH v6 08/19] KVM: arm64: Define access helpers for PMUSERENR and PMSELR
config: arm64-allnoconfig-bpf (https://download.01.org/0day-ci/archive/20260210/202602100555.etWxDEB0-lkp@intel.com/config)
compiler: aarch64-linux-gnu-gcc (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260210/202602100555.etWxDEB0-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/r/202602100555.etWxDEB0-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from ./arch/arm64/include/asm/kvm_host.h:38,
                    from ./include/linux/kvm_host.h:45,
                    from arch/arm64/kernel/asm-offsets.c:16:
>> ./include/kvm/arm_pmu.h:260:12: warning: 'kvm_vcpu_read_pmuserenr' defined but not used [-Wunused-function]
     260 | static u64 kvm_vcpu_read_pmuserenr(struct kvm_vcpu *vcpu)
         |            ^~~~~~~~~~~~~~~~~~~~~~~


vim +/kvm_vcpu_read_pmuserenr +260 ./include/kvm/arm_pmu.h

2d3f843993bdd5 Colton Lewis 2026-02-09  259  
2d3f843993bdd5 Colton Lewis 2026-02-09 @260  static u64 kvm_vcpu_read_pmuserenr(struct kvm_vcpu *vcpu)
2d3f843993bdd5 Colton Lewis 2026-02-09  261  {
2d3f843993bdd5 Colton Lewis 2026-02-09  262  	return 0;
2d3f843993bdd5 Colton Lewis 2026-02-09  263  }
2d3f843993bdd5 Colton Lewis 2026-02-09  264  

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki