Hi Wenjing, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 3e029760e6f8ce90c122c267a039ae73b3f1f5a4 commit: 3df212576e8b6fb94f8e4b856d39853557d22005 [5440/5886] drm/amd/display: add exit training mode and update channel coding in LT config: powerpc-randconfig-r023-20210528 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 6505c630407c5feec818f0bb1c284f9eeebf2071) 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 powerpc cross compiling tool for clang build # apt-get install binutils-powerpc-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=3df212576e8b6fb94f8e4b856d39853557d22005 git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout 3df212576e8b6fb94f8e4b856d39853557d22005 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link_dp.c:1370:16: warning: no previous prototype for function 'configure_lttpr_mode_transparent' [-Wmissing-prototypes] enum dc_status configure_lttpr_mode_transparent(struct dc_link *link) ^ drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link_dp.c:1370:1: note: declare 'static' if the function is not intended to be used outside of this translation unit enum dc_status configure_lttpr_mode_transparent(struct dc_link *link) ^ static drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link_dp.c:1381:16: warning: no previous prototype for function 'configure_lttpr_mode_non_transparent' [-Wmissing-prototypes] enum dc_status configure_lttpr_mode_non_transparent( ^ drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link_dp.c:1381:1: note: declare 'static' if the function is not intended to be used outside of this translation unit enum dc_status configure_lttpr_mode_non_transparent( ^ static >> drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link_dp.c:1638:16: warning: no previous prototype for function 'dpcd_configure_channel_coding' [-Wmissing-prototypes] enum dc_status dpcd_configure_channel_coding(struct dc_link *link, ^ drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link_dp.c:1638:1: note: declare 'static' if the function is not intended to be used outside of this translation unit enum dc_status dpcd_configure_channel_coding(struct dc_link *link, ^ static 3 warnings generated. vim +/dpcd_configure_channel_coding +1638 drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link_dp.c 1637 > 1638 enum dc_status dpcd_configure_channel_coding(struct dc_link *link, 1639 struct link_training_settings *lt_settings) 1640 { 1641 enum dp_link_encoding encoding = 1642 dp_get_link_encoding_format( 1643 <_settings->link_settings); 1644 enum dc_status status; 1645 1646 status = core_link_write_dpcd( 1647 link, 1648 DP_MAIN_LINK_CHANNEL_CODING_SET, 1649 (uint8_t *) &encoding, 1650 1); 1651 DC_LOG_HW_LINK_TRAINING("%s:\n 0x%X MAIN_LINK_CHANNEL_CODING_SET = %x\n", 1652 __func__, 1653 DP_MAIN_LINK_CHANNEL_CODING_SET, 1654 encoding); 1655 1656 return status; 1657 } 1658 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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