tree: git://people.freedesktop.org/~agd5f/linux.git amd-staging-drm-next head: 4589b6459d145ea133422b91be2f55a40fe74463 commit: cf3da8ea14f50741d6ddd3bee410459703036c4c [357/442] drm/amd/display: Update idle optimization handling config: x86_64-randconfig-a002-20200919 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project ed79827aea444e6995fb3d36abc2bfd36331773c) 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 git checkout cf3da8ea14f50741d6ddd3bee410459703036c4c # 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(a)intel.com&gt; All warnings (new ones prefixed by >>): drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc.c:777:6: warning: no previous prototype for function 'apply_ctx_interdependent_lock' [-Wmissing-prototypes] void apply_ctx_interdependent_lock(struct dc *dc, struct dc_state *context, struct dc_stream_state *stream, bool lock) ^ drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc.c:777:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void apply_ctx_interdependent_lock(struct dc *dc, struct dc_state *context, struct dc_stream_state *stream, bool lock) ^ static bool dc_is_plane_eligible_for_idle_optimizaitons(struct dc *dc, ^ drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc.c:3043:1: note: declare 'static' if the function is not intended to be used outside of this translation unit bool dc_is_plane_eligible_for_idle_optimizaitons(struct dc *dc, ^ static 2 warnings generated. git remote add radeon-alex git://people.freedesktop.org/~agd5f/linux.git git fetch --no-tags radeon-alex amd-staging-drm-next git checkout cf3da8ea14f50741d6ddd3bee410459703036c4c vim +/dc_is_plane_eligible_for_idle_optimizaitons +3043 drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc.c 3042 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org