[openeuler:OLK-6.6 1540/1540] arch/arm64/kvm/../../../virt/kvm/vfio.c:535:6: warning: no previous prototype for 'find_arm_smmu_domain'

[openeuler:OLK-6.6 1540/1540] arch/arm64/kvm/../../../virt/kvm/vfio.c:535:6: warning: no previous prototype for 'find_arm_smmu_domain'

[kernel test robot]

tree:   https://gitee.com/openeuler/kernel.git OLK-6.6
head:   321262d8251f07d9439cae39851f2bf2658d8813
commit: c57a5a1f767336eff9721cb833c067657ade31de [1540/1540] virtcca feature: activate confidential vm to set security device s_s2ttbr
config: arm64-randconfig-002-20241128 (https://download.01.org/0day-ci/archive/20241128/202411281809.d4MBGHxN-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241128/202411281809.d4MBGHxN-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202411281809.d4MBGHxN-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> arch/arm64/kvm/../../../virt/kvm/vfio.c:535:6: warning: no previous prototype for 'find_arm_smmu_domain' [-Wmissing-prototypes]
     535 | void find_arm_smmu_domain(struct kvm_vfio_file *kvf, struct list_head *smmu_domain_group_list)
         |      ^~~~~~~~~~~~~~~~~~~~


vim +/find_arm_smmu_domain +535 arch/arm64/kvm/../../../virt/kvm/vfio.c

   529	
   530	/**
   531	 * find_arm_smmu_domain - Find smmu domain list from kvm vfio file
   532	 * @kvf: Kvm vfio file
   533	 * @smmu_domain_group_list: List of smmu domain group
   534	 */
 > 535	void find_arm_smmu_domain(struct kvm_vfio_file *kvf, struct list_head *smmu_domain_group_list)
   536	{
   537		struct iommu_group *iommu_group;
   538		int ret = 0;
   539		struct arm_smmu_domain *arm_smmu_domain = NULL;
   540		struct arm_smmu_domain *arm_smmu_domain_node = NULL;
   541	
   542		iommu_group = cvm_vfio_file_iommu_group(kvf->file);
   543		arm_smmu_domain = to_smmu_domain(virtcca_iommu_group_get_domain(iommu_group));
   544		list_for_each_entry(arm_smmu_domain_node,
   545			smmu_domain_group_list, node) {
   546			if (arm_smmu_domain_node == arm_smmu_domain) {
   547				ret = -1;
   548				break;
   549			}
   550		}
   551		if (!ret)
   552			list_add_tail(&arm_smmu_domain->node, smmu_domain_group_list);
   553	}
   554	

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https://github.com/intel/lkp-tests/wiki