[intel-lts:6.6/preempt-rt 3/3] drivers/gpu/drm/i915/display/intel_color.c:2820:6: warning: variable 'index' set but not used

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

tree:   https://github.com/intel/linux-intel-lts.git 6.6/preempt-rt
head:   7f064b9d8937d880fb64d1df8d1e8b8115a1c128
commit: c12115088f707bd8090f94bb1bdc607afad810df [3/3] drm/i915/xelpd: Add support for Logarithmic gamma mode
config: i386-defconfig (https://download.01.org/0day-ci/archive/20241228/202412280207.sfxQ8fLf-lkp@intel.com/config)
compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241228/202412280207.sfxQ8fLf-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202412280207.sfxQ8fLf-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/gpu/drm/i915/display/intel_color.c:28:
   In file included from drivers/gpu/drm/i915/display/intel_de.h:9:
   In file included from drivers/gpu/drm/i915/i915_drv.h:40:
   In file included from drivers/gpu/drm/i915/display/intel_display_core.h:16:
   In file included from include/drm/drm_connector.h:32:
   In file included from include/drm/drm_util.h:36:
   In file included from include/linux/kgdb.h:19:
   In file included from include/linux/kprobes.h:28:
   In file included from include/linux/ftrace.h:13:
   In file included from include/linux/kallsyms.h:13:
   In file included from include/linux/mm.h:2168:
   include/linux/vmstat.h:522:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     522 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
>> drivers/gpu/drm/i915/display/intel_color.c:2820:6: warning: variable 'index' set but not used [-Wunused-but-set-variable]
    2820 |         u32 index = 0;
         |             ^
   2 warnings generated.


vim +/index +2820 drivers/gpu/drm/i915/display/intel_color.c

  2813	
  2814	static int icl_color_check(struct intel_crtc_state *crtc_state)
  2815	{
  2816		struct drm_device *dev = crtc_state->uapi.crtc->dev;
  2817		struct drm_i915_private *dev_priv = to_i915(dev);
  2818		struct drm_property *property = crtc_state->uapi.crtc->gamma_mode_property;
  2819		struct drm_property_enum *prop_enum;
> 2820		u32 index = 0;
  2821		int ret;
  2822	
  2823		ret = check_luts(crtc_state);
  2824		if (ret)
  2825			return ret;
  2826	
  2827		if (DISPLAY_VER(dev_priv) >= 13) {
  2828			list_for_each_entry(prop_enum, &property->enum_list, head) {
  2829				if (prop_enum->value == crtc_state->uapi.gamma_mode) {
  2830					if (!strcmp(prop_enum->name,
  2831						    "logarithmic gamma")) {
  2832						crtc_state->uapi.gamma_mode_type =
  2833							GAMMA_MODE_LOGARITHMIC_12BIT;
  2834						drm_dbg_kms(dev,
  2835							    "logarithmic gamma enabled\n");
  2836					}
  2837					break;
  2838				}
  2839				index++;
  2840			}
  2841		}
  2842	
  2843		crtc_state->gamma_mode = icl_gamma_mode(crtc_state);
  2844	
  2845		crtc_state->csc_mode = icl_csc_mode(crtc_state);
  2846	
  2847		intel_assign_luts(crtc_state);
  2848	
  2849		icl_assign_csc(crtc_state);
  2850	
  2851		crtc_state->preload_luts = intel_can_preload_luts(crtc_state);
  2852	
  2853		return 0;
  2854	}
  2855	

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