Hi Hans,

I love your patch! Perhaps something to improve:

[auto build test WARNING on drm-misc/drm-misc-next]
[cannot apply to linus/master v6.0-rc5 next-20220916]
[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/drm-gma500-Backlight-handling-changes/20220917-220535
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
config: x86_64-allmodconfig
compiler: gcc-11 (Debian 11.3.0-5) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/ff9adbc897036a56bb7c57aa407a489db1985400
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Hans-de-Goede/drm-gma500-Backlight-handling-changes/20220917-220535
        git checkout ff9adbc897036a56bb7c57aa407a489db1985400
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/gpu/drm/gma500/

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/gpu/drm/gma500/backlight.c: In function 'gma_backlight_init':
>> drivers/gpu/drm/gma500/backlight.c:73:37: warning: unused variable 'props' [-Wunused-variable]
      73 |         struct backlight_properties props = {};
         |                                     ^~~~~
   At top level:
>> drivers/gpu/drm/gma500/backlight.c:65:35: warning: 'gma_backlight_ops' defined but not used [-Wunused-const-variable=]
      65 | static const struct backlight_ops gma_backlight_ops = {
         |                                   ^~~~~~~~~~~~~~~~~


vim +/props +73 drivers/gpu/drm/gma500/backlight.c

    64	
  > 65	static const struct backlight_ops gma_backlight_ops = {
    66		.get_brightness = gma_backlight_get_brightness,
    67		.update_status  = gma_backlight_update_status,
    68	};
    69	
    70	int gma_backlight_init(struct drm_device *dev)
    71	{
    72		struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
  > 73		struct backlight_properties props = {};
    74		int ret;
    75	
    76		dev_priv->backlight_enabled = true;
    77		dev_priv->backlight_level = 100;
    78	
    79		ret = dev_priv->ops->backlight_init(dev);
    80		if (ret)
    81			return ret;
    82	

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