[PATCH] Verify Gamma & Degamma LUT sizes in amdgpu_dm_atomic_check

kernel test robot lkp at intel.com
Sat Jun 5 03:28:06 UTC 2021

Hi Mark,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on tegra-drm/drm/tegra/for-next]
[also build test WARNING on linus/master v5.13-rc4 next-20210604]
[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

url:    https://github.com/0day-ci/linux/commits/Mark-Yacoub/Verify-Gamma-Degamma-LUT-sizes-in-amdgpu_dm_atomic_check/20210605-010052
base:   git://anongit.freedesktop.org/tegra/linux.git drm/tegra/for-next
config: x86_64-randconfig-a014-20210604 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 5c0d1b2f902aa6a9cf47cc7e42c5b83bb2217cf9)
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 x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://github.com/0day-ci/linux/commit/69d2510b404de1ebb3ee54e37daff71f1df02a29
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Mark-Yacoub/Verify-Gamma-Degamma-LUT-sizes-in-amdgpu_dm_atomic_check/20210605-010052
        git checkout 69d2510b404de1ebb3ee54e37daff71f1df02a29
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp at intel.com>

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_color.c:288: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
    * Verifies that the Degamma and Gamma LUTs attached to the |crtc_state| are of

vim +288 drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_color.c

   287	/**
 > 288	 * Verifies that the Degamma and Gamma LUTs attached to the |crtc_state| are of
   289	 * the expected size.
   290	 * Returns 0 on success.
   291	 */
   292	int amdgpu_dm_verify_lut_sizes(const struct drm_crtc_state *crtc_state)
   293	{
   294		const struct drm_color_lut *lut = NULL;
   295		uint32_t size = 0;
   297		lut = __extract_blob_lut(crtc_state->degamma_lut, &size);
   298		if (lut && size != MAX_COLOR_LUT_ENTRIES) {
   300				"Invalid Degamma LUT size. Should be %u but got %u.\n",
   301				MAX_COLOR_LUT_ENTRIES, size);
   302			return -EINVAL;
   303		}
   305		lut = __extract_blob_lut(crtc_state->gamma_lut, &size);
   306		if (lut && size != MAX_COLOR_LUT_ENTRIES &&
   307		    size != MAX_COLOR_LEGACY_LUT_ENTRIES) {
   309				"Invalid Gamma LUT size. Should be %u (or %u for legacy) but got %u.\n",
   311				size);
   312			return -EINVAL;
   313		}
   315		return 0;
   316	}

0-DAY CI Kernel Test Service, Intel Corporation
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