Re: [PATCH] KVM: arm64: Properly restore PMU state during live-migration

[kernel test robot <lkp@intel.com>]

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Hi Jinank,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on kvmarm/next]
[also build test WARNING on arm/for-next soc/for-next arm64/for-next/core v5.13-rc4 next-20210603]
[cannot apply to xlnx/master]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Jinank-Jain/KVM-arm64-Properly-restore-PMU-state-during-live-migration/20210603-190755
base:   https://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm.git next
config: arm64-allyesconfig (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://github.com/0day-ci/linux/commit/08cb3fc07cb1a68f15eb4a3e68e886c40732e699
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Jinank-Jain/KVM-arm64-Properly-restore-PMU-state-during-live-migration/20210603-190755
        git checkout 08cb3fc07cb1a68f15eb4a3e68e886c40732e699
        # 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 warnings (new ones prefixed by >>):

   arch/arm64/kvm/pmu.c: In function 'kvm_vcpu_pmu_restore':
>> arch/arm64/kvm/pmu.c:172:2: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
     172 |  u64 val = __vcpu_sys_reg(vcpu, PMCR_EL0);
         |  ^~~


vim +172 arch/arm64/kvm/pmu.c

   163	
   164	/*
   165	 * Restore PMU events on first vcpu load.
   166	 */
   167	void kvm_vcpu_pmu_restore(struct kvm_vcpu *vcpu)
   168	{
   169		if (kvm_arm_pmu_v3_restored(vcpu))
   170			return;
   171	 
 > 172		u64 val = __vcpu_sys_reg(vcpu, PMCR_EL0);
   173	 
   174		kvm_pmu_handle_pmcr(vcpu, val);
   175	 
   176		vcpu->arch.pmu.restored = true;
   177	}
   178	

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

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