On Thu, Sep 02, 2021 at 06:22:29AM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   477f70cd2a67904e04c2c2b9bd0fa2e95222f2f6
> commit: fb04a1eddb1a65b6588a021bdc132270d5ae48bb KVM: X86: Implement ring-based dirty memory tracking
> date:   10 months ago
> config: i386-randconfig-r005-20210901 (attached as .config)
> compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 4b1fde8a2b681dad2ce0c082a5d6422caa06b0bc)
> 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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fb04a1eddb1a65b6588a021bdc132270d5ae48bb
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout fb04a1eddb1a65b6588a021bdc132270d5ae48bb
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=i386 
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@intel.com>
> 
> All errors (new ones prefixed by >>):
> 
> >> arch/x86/kvm/../../../virt/kvm/dirty_ring.c:94:20: error: unused function 'kvm_dirty_gfn_invalid' [-Werror,-Wunused-function]
>    static inline bool kvm_dirty_gfn_invalid(struct kvm_dirty_gfn *gfn)
>                       ^
>    1 error generated.
> 
> 
> vim +/kvm_dirty_gfn_invalid +94 arch/x86/kvm/../../../virt/kvm/dirty_ring.c
> 
>     93	
>   > 94	static inline bool kvm_dirty_gfn_invalid(struct kvm_dirty_gfn *gfn)
>     95	{
>     96		return gfn->flags == 0;
>     97	}
>     98	

https://lore.kernel.org/lkml/20210901230904.15164-1-peterx@redhat.com

Thanks,

-- 
Peter Xu