[kbuild-all] [intel-linux-intel-lts:5.4/yocto 42/1142] drivers/gpu/drm/kmb/kmb_plane.c:126:25: warning: no previous prototype for 'kmb_plane_duplicate_state'

tree: https://github.com/intel/linux-intel-lts.git 5.4/yocto head: eeb611e5394c56d45c5cc8f7dc484c9f19e93143 commit: 767c8610f6fcd7b765189fc01eff0131aa6c19d5 [42/1142] drm/kmb: Add support for KeemBay Display config: arm64-allyesconfig (attached as .config) compiler: aarch64-linux-gcc (GCC) 9.3.0 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 # https://github.com/intel/linux-intel-lts/commit/767c8610f6fcd7b765189fc01... git remote add intel-linux-intel-lts https://github.com/intel/linux-intel-lts.git git fetch --no-tags intel-linux-intel-lts 5.4/yocto git checkout 767c8610f6fcd7b765189fc01eff0131aa6c19d5 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 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 >>): 126 | struct drm_plane_state *kmb_plane_duplicate_state(struct drm_plane *plane) | ^~~~~~~~~~~~~~~~~~~~~~~~~ vim +/kmb_plane_duplicate_state +126 drivers/gpu/drm/kmb/kmb_plane.c 125 127 { 128 struct drm_plane_state *state; 129 struct kmb_plane_state *kmb_state; 130 131 kmb_state = kmemdup(plane->state, sizeof(*kmb_state), GFP_KERNEL); 132 133 if (!kmb_state) 134 return NULL; 135 136 state = &kmb_state->base_plane_state; 137 __drm_atomic_helper_plane_duplicate_state(plane, state); 138 139 return state; 140 } 141 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org