linux-kernel - Re: [PATCH] KVM: remove buggy vcpu id check on vcpu creation

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Message-ID: <201604202337.R8FSzUrr%fengguang.wu@intel.com>
Date:	Wed, 20 Apr 2016 23:21:06 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Greg Kurz <gkurz@...ux.vnet.ibm.com>
Cc:	kbuild-all@...org, Paolo Bonzini <pbonzini@...hat.com>,
	james.hogan@...tec.com, mingo@...hat.com,
	linux-mips@...ux-mips.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, qemu-ppc@...gnu.org,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Paul Mackerras <paulus@...ba.org>,
	David Gibson <david@...son.dropbear.id.au>
Subject: Re: [PATCH] KVM: remove buggy vcpu id check on vcpu creation

Hi,

[auto build test WARNING on kvm/linux-next]
[also build test WARNING on v4.6-rc4 next-20160420]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Greg-Kurz/KVM-remove-buggy-vcpu-id-check-on-vcpu-creation/20160420-231233
base:   https://git.kernel.org/pub/scm/virt/kvm/kvm.git linux-next
config: x86_64-randconfig-x017-201616 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   arch/x86/kvm/x86.c: In function 'kvm_arch_vcpu_create':
>> arch/x86/kvm/x86.c:7362:10: warning: return makes pointer from integer without a cast [-Wint-conversion]
      return -EINVAL;
             ^

vim +7362 arch/x86/kvm/x86.c

  7346	}
  7347	
  7348	void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
  7349	{
  7350		kvmclock_reset(vcpu);
  7351	
  7352		free_cpumask_var(vcpu->arch.wbinvd_dirty_mask);
  7353		kvm_x86_ops->vcpu_free(vcpu);
  7354	}
  7355	
  7356	struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
  7357							unsigned int id)
  7358	{
  7359		struct kvm_vcpu *vcpu;
  7360	
  7361		if (id >= KVM_MAX_VCPUS)
> 7362			return -EINVAL;
  7363	
  7364		if (check_tsc_unstable() && atomic_read(&kvm->online_vcpus) != 0)
  7365			printk_once(KERN_WARNING
  7366			"kvm: SMP vm created on host with unstable TSC; "
  7367			"guest TSC will not be reliable\n");
  7368	
  7369		vcpu = kvm_x86_ops->vcpu_create(kvm, id);
  7370	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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