[xilinx-xlnx:xlnx_rebase_v5.10 223/1963] drivers/media/i2c/adv7511-v4l2.c:2251:21: warning: no previous prototype for function 'adv7511_subdev'

[kernel test robot]

tree:   https://github.com/Xilinx/linux-xlnx xlnx_rebase_v5.10
head:   9533b527bd9799dc64feddba388e19f0efe27bde
commit: c879ca1c486ba6c809ca48c82c0c8a289d97ce15 [223/1963] drivers: media: Customized adv7511 for Xylon LogiCVC (deprecated)
config: x86_64-randconfig-a014-20210929 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project dc6e8dfdfe7efecfda318d43a06fae18b40eb498)
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=clang make.cross W=1 ARCH=x86_64 

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:427:2: error: void function 'adv7511_set_rgb_quantization_mode' should not return a value [-Wreturn-type]
           return 0;
           ^      ~
>> drivers/media/i2c/adv7511-v4l2.c:2251:21: warning: no previous prototype for function 'adv7511_subdev' [-Wmissing-prototypes]
   struct v4l2_subdev *adv7511_subdev(struct v4l2_subdev *sd)
                       ^
   drivers/media/i2c/adv7511-v4l2.c:2251:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   struct v4l2_subdev *adv7511_subdev(struct v4l2_subdev *sd)
   ^
   static 
   1 warning and 1 error generated.


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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