Re: [PATCH v6 29/44] drm/amd/display: Add support for sRGB EOTF in BLND block

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

Hi Harry,

kernel test robot noticed the following build warnings:

[auto build test WARNING on drm/drm-next]
[also build test WARNING on drm-exynos/exynos-drm-next drm-misc/drm-misc-next linus/master v6.12-rc1 next-20241004]
[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/Harry-Wentland/drm-Add-helper-for-conversion-from-signed-magnitude/20241004-040629
base:   git://anongit.freedesktop.org/drm/drm drm-next
patch link:    https://lore.kernel.org/r/20241003200129.1732122-30-harry.wentland%40amd.com
patch subject: [PATCH v6 29/44] drm/amd/display: Add support for sRGB EOTF in BLND block
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20241005/202410052046.3g21jba1-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241005/202410052046.3g21jba1-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/202410052046.3g21jba1-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_color.c:1296:46: warning: variable 'blend_size' is uninitialized when used here [-Wuninitialized]
    1296 |                 return __set_input_tf(NULL, tf, blend_lut, blend_size);
         |                                                            ^~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_color.c:1278:21: note: initialize the variable 'blend_size' to silence this warning
    1278 |         uint32_t blend_size;
         |                            ^
         |                             = 0
   1 warning generated.

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for MODVERSIONS
   Depends on [n]: MODULES [=y] && !COMPILE_TEST [=y]
   Selected by [y]:
   - RANDSTRUCT_FULL [=y] && (CC_HAS_RANDSTRUCT [=y] || GCC_PLUGINS [=n]) && MODULES [=y]


vim +/blend_size +1296 drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_color.c

  1273	
  1274		struct dc_transfer_func *tf = &dc_plane_state->blend_tf;
  1275		struct drm_colorop *colorop = colorop_state->colorop;
  1276		struct drm_device *drm = colorop->dev;
  1277		const struct drm_color_lut *blend_lut;
  1278		uint32_t blend_size;
  1279	
  1280		if (colorop->type != DRM_COLOROP_1D_CURVE &&
  1281		    colorop_state->curve_1d_type != DRM_COLOROP_1D_CURVE_SRGB_EOTF)
  1282			return -EINVAL;
  1283	
  1284		if (colorop_state->bypass) {
  1285			tf->type = TF_TYPE_BYPASS;
  1286			tf->tf = TRANSFER_FUNCTION_LINEAR;
  1287			return 0;
  1288		}
  1289	
  1290		drm_dbg(drm, "Blend colorop with ID: %d\n", colorop->base.id);
  1291	
  1292		if (colorop->type == DRM_COLOROP_1D_CURVE) {
  1293			tf->type = TF_TYPE_DISTRIBUTED_POINTS;
  1294			tf->tf = amdgpu_colorop_tf_to_dc_tf(colorop_state->curve_1d_type);
  1295			tf->sdr_ref_white_level = SDR_WHITE_LEVEL_INIT_VALUE;
> 1296			return __set_input_tf(NULL, tf, blend_lut, blend_size);
  1297		}
  1298	
  1299		return -EINVAL;
  1300	}
  1301	

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