Hi Hans,

kernel test robot noticed the following build warnings:

[auto build test WARNING on media-tree/master]
[also build test WARNING on linus/master sailus-media-tree/streams v6.4-rc2 next-20230518]
[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/Hans-de-Goede/media-v4l-Add-v4l2_acpi_parse_sensor_gpios-helper-function/20230518-233727
base:   git://linuxtv.org/media_tree.git master
patch link:    https://lore.kernel.org/r/20230518153214.194976-2-hdegoede%40redhat.com
patch subject: [PATCH 1/9] media: v4l: Add v4l2_acpi_parse_sensor_gpios() helper function
config: ia64-buildonly-randconfig-r004-20230517
compiler: ia64-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/f25b51366af07f398d93a8ab49d51668cad2e258
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Hans-de-Goede/media-v4l-Add-v4l2_acpi_parse_sensor_gpios-helper-function/20230518-233727
        git checkout f25b51366af07f398d93a8ab49d51668cad2e258
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=ia64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=ia64 SHELL=/bin/bash drivers/media/v4l2-core/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202305190321.6Dq9id9F-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/media/v4l2-core/v4l2-acpi.c:140:6: warning: no previous prototype for 'v4l2_acpi_parse_sensor_gpios' [-Wmissing-prototypes]
     140 | void v4l2_acpi_parse_sensor_gpios(struct device *dev)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/v4l2_acpi_parse_sensor_gpios +140 drivers/media/v4l2-core/v4l2-acpi.c

   123	
   124	/*
   125	 * Helper function to create an ACPI GPIO lookup table for sensor reset and
   126	 * powerdown signals on Intel Bay Trail (BYT) and Cherry Trail (CHT) devices,
   127	 * including setting the correct polarity for the GPIO.
   128	 *
   129	 * This uses the "79234640-9e10-4fea-a5c1-b5aa8b19756f" DSM method directly
   130	 * on the sensor device's ACPI node. This is different from later Intel
   131	 * hardware which has a separate INT3472 with this info. Since there is
   132	 * no separate firmware-node to which we can bind to register the GPIO lookups
   133	 * this unfortunately means that all sensor drivers which may be used on
   134	 * BYT or CHT hw need to call this function.
   135	 *
   136	 * Note this code uses the same DSM GUID as the INT3472 discrete.c code
   137	 * and there is some overlap, but there are enough differences that it is
   138	 * difficult to share the code.
   139	 */
 > 140	void v4l2_acpi_parse_sensor_gpios(struct device *dev)

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki