[xilinx-xlnx:xlnx_rebase_v5.10 223/1981] drivers/media/i2c/adv7511-v4l2.c:2251:21: warning: no previous prototype for function 'adv7511_subdev'

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

Hi Radhey,

FYI, the error/warning still remains.

tree:   https://github.com/Xilinx/linux-xlnx xlnx_rebase_v5.10
head:   87ec9a2d98a7a7dfc98b57348a0ec310fd170e4b
commit: c879ca1c486ba6c809ca48c82c0c8a289d97ce15 [223/1981] drivers: media: Customized adv7511 for Xylon LogiCVC (deprecated)
config: riscv-randconfig-r042-20211214 (https://download.01.org/0day-ci/archive/20211215/202112150131.smFBwCJv-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project b6a2ddb6c8ac29412b1361810972e15221fa021c)
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
        # install riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # 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 config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash drivers/input/misc/ drivers/media/i2c/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@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
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