[intel-linux-intel-lts:5.4/yocto 8380/8941] drivers/gpu/drm/kmb/kmb_plane.c:126:25: warning: no previous prototype for 'kmb_plane_duplicate_state'

[intel-linux-intel-lts:5.4/yocto 8380/8941] drivers/gpu/drm/kmb/kmb_plane.c:126:25: warning: no previous prototype for 'kmb_plane_duplicate_state'

[kernel test robot]

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tree:   https://github.com/intel/linux-intel-lts.git 5.4/yocto
head:   0194b1072920957ee8a7abdfb3ddebee69c1d485
commit: 776ba618de297ec68dc793e07376b2fcaa9cc80b [8380/8941] 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
        git checkout 776ba618de297ec68dc793e07376b2fcaa9cc80b
        # 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@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/kmb/kmb_plane.c:126:25: warning: no previous prototype for 'kmb_plane_duplicate_state' [-Wmissing-prototypes]
     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	
 > 126	struct drm_plane_state *kmb_plane_duplicate_state(struct drm_plane *plane)
   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(a)lists.01.org

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