Re: [PATCH] iommu/vt-d: Introduce a rb_tree for looking up device

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

Hi Huang,

kernel test robot noticed the following build warnings:

[auto build test WARNING on v6.5-rc7]
[also build test WARNING on linus/master]
[cannot apply to joro-iommu/next next-20230822]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Huang-Jiaqing/iommu-vt-d-Introduce-a-rb_tree-for-looking-up-device/20230821-151945
base:   v6.5-rc7
patch link:    https://lore.kernel.org/r/20230821071659.123981-1-jiaqing.huang%40intel.com
patch subject: [PATCH] iommu/vt-d: Introduce a rb_tree for looking up device
config: x86_64-defconfig (https://download.01.org/0day-ci/archive/20230823/202308230922.9PKf5JkV-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-12) 11.3.0
reproduce: (https://download.01.org/0day-ci/archive/20230823/202308230922.9PKf5JkV-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/202308230922.9PKf5JkV-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/iommu/intel/iommu.c:239:28: warning: no previous prototype for 'device_rbtree_find' [-Wmissing-prototypes]
     239 | struct device_domain_info *device_rbtree_find(struct intel_iommu *iommu, u8 bus, u8 devfn)
         |                            ^~~~~~~~~~~~~~~~~~


vim +/device_rbtree_find +239 drivers/iommu/intel/iommu.c

   237	
   238	
 > 239	struct device_domain_info *device_rbtree_find(struct intel_iommu *iommu, u8 bus, u8 devfn)
   240	{
   241		struct device_domain_info *data = NULL;
   242		struct rb_node *node;
   243	
   244		down_read(&iommu->iopf_device_sem);
   245	
   246		node = iommu->iopf_device_rbtree.rb_node;
   247		while (node) {
   248			data = container_of(node, struct device_domain_info, node);
   249			s16 result = RB_NODE_CMP(bus, devfn, data->bus, data->devfn);
   250	
   251			if (result < 0)
   252				node = node->rb_left;
   253			else if (result > 0)
   254				node = node->rb_right;
   255			else
   256				break;
   257		}
   258		up_read(&iommu->iopf_device_sem);
   259	
   260		return node ? data : NULL;
   261	}
   262	

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