[xilinx-xlnx:xlnx_rebase_v5.10 223/1964] drivers/media/i2c/adv7511-v4l2.c:2251:21: warning: no previous prototype for 'adv7511_subdev'

[kernel test robot]

tree:   https://github.com/Xilinx/linux-xlnx xlnx_rebase_v5.10
head:   0a6e9d56f285540e5ca6c69c7fad2c3520b79c50
commit: c879ca1c486ba6c809ca48c82c0c8a289d97ce15 [223/1964] drivers: media: Customized adv7511 for Xylon LogiCVC (deprecated)
config: openrisc-randconfig-r023-20210930 (attached as .config)
compiler: or1k-linux-gcc (GCC) 11.2.0
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/Xilinx/linux-xlnx/commit/c879ca1c486ba6c809ca48c82c0c8a289d97ce15
        git remote add xilinx-xlnx https://github.com/Xilinx/linux-xlnx
        git fetch --no-tags xilinx-xlnx xlnx_rebase_v5.10
        git checkout c879ca1c486ba6c809ca48c82c0c8a289d97ce15
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=openrisc 

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

All warnings (new ones prefixed by >>):

   drivers/media/i2c/adv7511-v4l2.c: In function 'adv7511_set_rgb_quantization_mode':
   drivers/media/i2c/adv7511-v4l2.c:427:16: error: 'return' with a value, in function returning void [-Werror=return-type]
     427 |         return 0;
         |                ^
   drivers/media/i2c/adv7511-v4l2.c:422:13: note: declared here
     422 | static void adv7511_set_rgb_quantization_mode(struct v4l2_subdev *sd, struct v4l2_ctrl *ctrl)
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/media/i2c/adv7511-v4l2.c: At top level:
>> drivers/media/i2c/adv7511-v4l2.c:2251:21: warning: no previous prototype for 'adv7511_subdev' [-Wmissing-prototypes]
    2251 | struct v4l2_subdev *adv7511_subdev(struct v4l2_subdev *sd)
         |                     ^~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/adv7511_subdev +2251 drivers/media/i2c/adv7511-v4l2.c

  2250	
> 2251	struct v4l2_subdev *adv7511_subdev(struct v4l2_subdev *sd)
  2252	{
  2253		static struct v4l2_subdev *subdev;
  2254	
  2255		if (sd)
  2256			subdev = sd;
  2257	
  2258		return subdev;
  2259	}
  2260	EXPORT_SYMBOL(adv7511_subdev);
  2261	

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