Hi Yunke,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on next-20220929]
[cannot apply to media-tree/master linus/master v6.0-rc7 v6.0-rc6 v6.0-rc5 v6.0-rc7]
[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/Yunke-Cao/media-Implement-UVC-v1-5-ROI/20220930-144303
base:    1c6c4f42b3de4f18ea96d62950d0e266ca35a055
config: m68k-allyesconfig
compiler: m68k-linux-gcc (GCC) 12.1.0
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
        # https://github.com/intel-lab-lkp/linux/commit/2f3439f034d65c9f00a14f64d8e94e824e140a20
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Yunke-Cao/media-Implement-UVC-v1-5-ROI/20220930-144303
        git checkout 2f3439f034d65c9f00a14f64d8e94e824e140a20
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=m68k SHELL=/bin/bash drivers/media/

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

All warnings (new ones prefixed by >>):

   drivers/media/usb/uvc/uvc_ctrl.c:1847:5: warning: no previous prototype for '__uvc_ctrl_get_boundary_std' [-Wmissing-prototypes]
    1847 | int __uvc_ctrl_get_boundary_std(struct uvc_video_chain *chain,
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/media/usb/uvc/uvc_ctrl.c:1909:5: warning: no previous prototype for '__uvc_ctrl_set_compound' [-Wmissing-prototypes]
    1909 | int __uvc_ctrl_set_compound(struct uvc_control_mapping *mapping,
         |     ^~~~~~~~~~~~~~~~~~~~~~~


vim +/__uvc_ctrl_set_compound +1909 drivers/media/usb/uvc/uvc_ctrl.c

  1908	
> 1909	int __uvc_ctrl_set_compound(struct uvc_control_mapping *mapping,
  1910				    struct v4l2_ext_control *xctrl,
  1911				    struct uvc_control *ctrl)
  1912	{
  1913		u8 *data;
  1914		int ret;
  1915	
  1916		if (xctrl->size != mapping->v4l2_size / 8)
  1917			return -EINVAL;
  1918	
  1919		data = kmalloc(xctrl->size, GFP_KERNEL);
  1920		if (!data)
  1921			return -ENOMEM;
  1922	
  1923		ret = copy_from_user(data, xctrl->ptr, xctrl->size);
  1924		if (ret < 0)
  1925			goto out;
  1926	
  1927		ret = mapping->set_compound(mapping, data,
  1928				uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT));
  1929	
  1930		__uvc_ctrl_get_compound(mapping, ctrl, UVC_CTRL_DATA_CURRENT, xctrl);
  1931	
  1932	out:
  1933		kfree(data);
  1934		return ret;
  1935	}
  1936	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp