linux-kernel - Re: [PATCH] KVM: fix overflow of zero page refcount ksm use_zero

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Date:   Mon, 14 Oct 2019 20:03:41 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Zhuang Yanying <ann.zhuangyanying@...wei.com>
Cc:     kbuild-all@...ts.01.org, ann.zhuangyanying@...wei.com,
        linfeng23@...wei.com, pbonzini@...hat.com,
        linux-kernel@...r.kernel.org, weiqi4@...wei.com,
        weidong.huang@...wei.com
Subject: Re: [PATCH] KVM: fix overflow of zero page refcount  ksm
 use_zero_pages

Hi Zhuang,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on kvm/linux-next]
[cannot apply to v5.4-rc3 next-20191011]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Zhuang-Yanying/KVM-fix-overflow-of-zero-page-refcount-ksm-use_zero_pages/20191014-020341
base:   https://git.kernel.org/pub/scm/virt/kvm/kvm.git linux-next
config: x86_64-lkp (attached as .config)
compiler: gcc-7 (Debian 7.4.0-13) 7.4.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

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

All errors (new ones prefixed by >>):

   arch/x86/kvm/../../../virt/kvm/kvm_main.c: In function 'kvm_is_reserved_pfn':
>> arch/x86/kvm/../../../virt/kvm/kvm_main.c:155:23: error: 'page' undeclared (first use in this function)
      return PageReserved(page) && !is_zero_pfn(pfn);
                          ^~~~
   arch/x86/kvm/../../../virt/kvm/kvm_main.c:155:23: note: each undeclared identifier is reported only once for each function it appears in

vim +/page +155 arch/x86/kvm/../../../virt/kvm/kvm_main.c

   151	
   152	bool kvm_is_reserved_pfn(kvm_pfn_t pfn)
   153	{
   154		if (pfn_valid(pfn))
 > 155			return PageReserved(page) && !is_zero_pfn(pfn);
   156	
   157		return true;
   158	}
   159	

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