linux-kernel - Re: [PATCH v3] KVM: kvmclock: Fix vCPUs

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Message-ID: <202102020128.gPbbbp1J-lkp@intel.com>
Date:   Tue, 2 Feb 2021 01:31:43 +0800
From:   kernel test robot <lkp@...el.com>
To:     Wanpeng Li <kernellwp@...il.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Brijesh Singh <brijesh.singh@....com>
Subject: Re: [PATCH v3] KVM: kvmclock: Fix vCPUs > 64 can't be
 online/hotpluged

Hi Wanpeng,

I love your patch! Perhaps something to improve:

[auto build test WARNING on kvm/linux-next]
[also build test WARNING on linux/master vhost/linux-next next-20210125]
[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/Wanpeng-Li/KVM-kvmclock-Fix-vCPUs-64-can-t-be-online-hotpluged/20210201-163927
base:   https://git.kernel.org/pub/scm/virt/kvm/kvm.git linux-next
config: x86_64-randconfig-a013-20210201 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 275c6af7d7f1ed63a03d05b4484413e447133269)
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 x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://github.com/0day-ci/linux/commit/132ae1cea476666dff619b5a7c5675011edd7fe7
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Wanpeng-Li/KVM-kvmclock-Fix-vCPUs-64-can-t-be-online-hotpluged/20210201-163927
        git checkout 132ae1cea476666dff619b5a7c5675011edd7fe7
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

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

All warnings (new ones prefixed by >>):

>> arch/x86/kernel/kvmclock.c:274:5: warning: ISO C90 forbids mixing declarations and code [-Wdeclaration-after-statement]
           u8 flags;
              ^
   1 warning generated.


vim +274 arch/x86/kernel/kvmclock.c

6a1cac56f41f9e Brijesh Singh   2018-09-14  268  
e499a9b6dc488a Thomas Gleixner 2018-07-19  269  static int __init kvm_setup_vsyscall_timeinfo(void)
e499a9b6dc488a Thomas Gleixner 2018-07-19  270  {
132ae1cea47666 Wanpeng Li      2021-02-01  271  	kvmclock_init_mem();
132ae1cea47666 Wanpeng Li      2021-02-01  272  
e499a9b6dc488a Thomas Gleixner 2018-07-19  273  #ifdef CONFIG_X86_64
e499a9b6dc488a Thomas Gleixner 2018-07-19 @274  	u8 flags;
e499a9b6dc488a Thomas Gleixner 2018-07-19  275  
95a3d4454bb1cf Thomas Gleixner 2018-07-19  276  	if (!per_cpu(hv_clock_per_cpu, 0) || !kvmclock_vsyscall)
e499a9b6dc488a Thomas Gleixner 2018-07-19  277  		return 0;
e499a9b6dc488a Thomas Gleixner 2018-07-19  278  
95a3d4454bb1cf Thomas Gleixner 2018-07-19  279  	flags = pvclock_read_flags(&hv_clock_boot[0].pvti);
e499a9b6dc488a Thomas Gleixner 2018-07-19  280  	if (!(flags & PVCLOCK_TSC_STABLE_BIT))
95a3d4454bb1cf Thomas Gleixner 2018-07-19  281  		return 0;
e499a9b6dc488a Thomas Gleixner 2018-07-19  282  
b95a8a27c300d1 Thomas Gleixner 2020-02-07  283  	kvm_clock.vdso_clock_mode = VDSO_CLOCKMODE_PVCLOCK;
e499a9b6dc488a Thomas Gleixner 2018-07-19  284  #endif
6a1cac56f41f9e Brijesh Singh   2018-09-14  285  
e499a9b6dc488a Thomas Gleixner 2018-07-19  286  	return 0;
e499a9b6dc488a Thomas Gleixner 2018-07-19  287  }
e499a9b6dc488a Thomas Gleixner 2018-07-19  288  early_initcall(kvm_setup_vsyscall_timeinfo);
e499a9b6dc488a Thomas Gleixner 2018-07-19  289  

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

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