linux-kernel - Re: [PATCH v9 05/14] KVM: X86: Implement ring-based dirty memory tracking

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Date:   Mon, 25 May 2020 11:33:47 -0400
From:   Peter Xu <peterx@...hat.com>
To:     kbuild test robot <lkp@...el.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        kbuild-all@...ts.01.org, Vitaly Kuznetsov <vkuznets@...hat.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        Christophe de Dinechin <dinechin@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Kevin Tian <kevin.tian@...el.com>
Subject: Re: [PATCH v9 05/14] KVM: X86: Implement ring-based dirty memory
 tracking

On Mon, May 25, 2020 at 10:54:58PM +0800, kbuild test robot wrote:
> Hi Peter,
> 
> Thank you for the patch! Perhaps something to improve:
> 
> [auto build test WARNING on vhost/linux-next]
> [also build test WARNING on linus/master v5.7-rc7]
> [cannot apply to kvm/linux-next tip/auto-latest linux/master next-20200522]
> [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/Peter-Xu/KVM-Dirty-ring-interface/20200524-070926
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next
> config: x86_64-allyesconfig (attached as .config)
> compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
> reproduce (this is a W=1 build):
>         # save the attached .config to linux build tree
>         make W=1 ARCH=x86_64 
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kbuild test robot <lkp@...el.com>
> 
> All warnings (new ones prefixed by >>, old ones prefixed by <<):
> 
> >> arch/x86/kvm/../../../virt/kvm/dirty_ring.c:33:6: warning: no previous prototype for 'kvm_dirty_ring_full' [-Wmissing-prototypes]
> bool kvm_dirty_ring_full(struct kvm_dirty_ring *ring)
> ^~~~~~~~~~~~~~~~~~~

I'll add a "static" to quiesce this..

> --
> arch/x86/kvm/vmx/vmx.c: In function 'init_rmode_identity_map':
> >> arch/x86/kvm/vmx/vmx.c:3472:12: warning: variable 'identity_map_pfn' set but not used [-Wunused-but-set-variable]
> kvm_pfn_t identity_map_pfn;
> ^~~~~~~~~~~~~~~~

Hmm, this seems to be true but not related to this series afaict...  but sure I
can add another patch to remove it.

> 
> vim +/kvm_dirty_ring_full +33 arch/x86/kvm/../../../virt/kvm/dirty_ring.c
> 
>     32	
>   > 33	bool kvm_dirty_ring_full(struct kvm_dirty_ring *ring)
>     34	{
>     35		return kvm_dirty_ring_used(ring) >= ring->size;
>     36	}
>     37	
> 
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org



-- 
Peter Xu