tree:   https://gitlab.freedesktop.org/agd5f/linux.git drm-next
head:   eaae0714f4a82df81a60c6aae74c568e8974a716
commit: 9c0dc981c97dc7a439469dff76bacf6415514496 [49/92] drm/amd/display: Reduce dmesg error to a debug print
config: riscv-randconfig-r004-20211118 (attached as .config)
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 riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        git remote add agd5f https://gitlab.freedesktop.org/agd5f/linux.git
        git fetch --no-tags agd5f drm-next
        git checkout 9c0dc981c97dc7a439469dff76bacf6415514496
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=riscv 

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

All errors (new ones prefixed by >>):

   In file included from drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link_dp.c:37:
   In file included from drivers/gpu/drm/amd/amdgpu/../display/dc/dc_dmub_srv.h:30:
   In file included from drivers/gpu/drm/amd/amdgpu/../display/dmub/dmub_srv.h:67:
   drivers/gpu/drm/amd/amdgpu/../display/dmub/inc/dmub_cmd.h:2892:12: warning: variable 'temp' set but not used [-Wunused-but-set-variable]
                   uint64_t temp;
                            ^
>> drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link_dp.c:4457:4: error: implicit declaration of function 'DC_LOG_DP2' [-Werror,-Wimplicit-function-declaration]
                           DC_LOG_DP2("%s: Read LTTPR caps data failed.\n", __func__);
                           ^
   1 warning and 1 error generated.


vim +/DC_LOG_DP2 +4457 drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link_dp.c

  4446	
  4447		if (link->lttpr_mode == LTTPR_MODE_NON_TRANSPARENT || link->lttpr_mode == LTTPR_MODE_TRANSPARENT) {
  4448			/* By reading LTTPR capability, RX assumes that we will enable
  4449			 * LTTPR extended aux timeout if LTTPR is present.
  4450			 */
  4451			status = core_link_read_dpcd(
  4452					link,
  4453					DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV,
  4454					lttpr_dpcd_data,
  4455					sizeof(lttpr_dpcd_data));
  4456			if (status != DC_OK) {
> 4457				DC_LOG_DP2("%s: Read LTTPR caps data failed.\n", __func__);
  4458				return false;
  4459			}
  4460	
  4461			link->dpcd_caps.lttpr_caps.revision.raw =
  4462					lttpr_dpcd_data[DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV -
  4463									DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV];
  4464	
  4465			link->dpcd_caps.lttpr_caps.max_link_rate =
  4466					lttpr_dpcd_data[DP_MAX_LINK_RATE_PHY_REPEATER -
  4467									DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV];
  4468	
  4469			link->dpcd_caps.lttpr_caps.phy_repeater_cnt =
  4470					lttpr_dpcd_data[DP_PHY_REPEATER_CNT -
  4471									DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV];
  4472	
  4473			link->dpcd_caps.lttpr_caps.max_lane_count =
  4474					lttpr_dpcd_data[DP_MAX_LANE_COUNT_PHY_REPEATER -
  4475									DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV];
  4476	
  4477			link->dpcd_caps.lttpr_caps.mode =
  4478					lttpr_dpcd_data[DP_PHY_REPEATER_MODE -
  4479									DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV];
  4480	
  4481			link->dpcd_caps.lttpr_caps.max_ext_timeout =
  4482					lttpr_dpcd_data[DP_PHY_REPEATER_EXTENDED_WAIT_TIMEOUT -
  4483									DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV];
  4484	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org