[chrome-os:chromeos-5.10 121/124] arch/arm64/kvm/../../../virt/kvm/kvm_main.c:571:13: warning: no previous prototype for 'kvm_arch_mmu_clear_young_walk'

[kernel test robot <lkp@intel.com>]

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tree:   https://chromium.googlesource.com/chromiumos/third_party/kernel chromeos-5.10
head:   8afd29eb63c85f421c2fd28ae3e25d0041b8d61b
commit: 096a432b5e0916c1bb47e322d9a3316416a6154c [121/124] CHROMIUM: mm: multigenerational lru: scan kvm mmu pages
config: arm64-allyesconfig (attached as .config)
compiler: aarch64-linux-gcc (GCC) 9.3.0
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
        git remote add chrome-os https://chromium.googlesource.com/chromiumos/third_party/kernel
        git fetch --no-tags chrome-os chromeos-5.10
        git checkout 096a432b5e0916c1bb47e322d9a3316416a6154c
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 

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

All warnings (new ones prefixed by >>):

>> arch/arm64/kvm/../../../virt/kvm/kvm_main.c:571:13: warning: no previous prototype for 'kvm_arch_mmu_clear_young_walk' [-Wmissing-prototypes]
     571 | __weak void kvm_arch_mmu_clear_young_walk(struct kvm *kvm,
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/kvm_arch_mmu_clear_young_walk +571 arch/arm64/kvm/../../../virt/kvm/kvm_main.c

   570	
 > 571	__weak void kvm_arch_mmu_clear_young_walk(struct kvm *kvm,
   572						  struct mmu_notifier_walk *walk)
   573	{
   574	}
   575	

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

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