[drm-misc:for-linux-next 5/9] drivers/gpu/drm/drm_fb_dma_helper.c:164:5: warning: no previous prototype for function 'drm_fb_dma_get_scanout_buffer'

[kernel test robot <lkp@intel.com>]

tree:   git://anongit.freedesktop.org/drm/drm-misc for-linux-next
head:   7b0062036c3b71b4a69e244ecf0502c06c4cf5f0
commit: 879b3b6511fe92b1b93dfc543961347289a8aeaa [5/9] drm/fb_dma: Add generic get_scanout_buffer() for drm_panic
config: riscv-defconfig (https://download.01.org/0day-ci/archive/20240416/202404160702.2kFuK6Qq-lkp@intel.com/config)
compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project 7089c359a3845323f6f30c44a47dd901f2edfe63)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240416/202404160702.2kFuK6Qq-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202404160702.2kFuK6Qq-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/gpu/drm/drm_fb_dma_helper.c:12:
   In file included from include/drm/drm_damage_helper.h:35:
   In file included from include/drm/drm_atomic_helper.h:31:
   In file included from include/drm/drm_crtc.h:32:
   In file included from include/drm/drm_modes.h:33:
   In file included from include/drm/drm_connector.h:32:
   In file included from include/drm/drm_util.h:35:
   In file included from include/linux/interrupt.h:21:
   In file included from arch/riscv/include/asm/sections.h:9:
   In file included from include/linux/mm.h:2208:
   include/linux/vmstat.h:522:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     522 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
>> drivers/gpu/drm/drm_fb_dma_helper.c:164:5: warning: no previous prototype for function 'drm_fb_dma_get_scanout_buffer' [-Wmissing-prototypes]
     164 | int drm_fb_dma_get_scanout_buffer(struct drm_plane *plane,
         |     ^
   drivers/gpu/drm/drm_fb_dma_helper.c:164:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
     164 | int drm_fb_dma_get_scanout_buffer(struct drm_plane *plane,
         | ^
         | static 
   2 warnings generated.
--
>> drivers/gpu/drm/drm_fb_dma_helper.c:166: warning: Function parameter or struct member 'sb' not described in 'drm_fb_dma_get_scanout_buffer'
>> drivers/gpu/drm/drm_fb_dma_helper.c:166: warning: Excess function parameter 'drm_scanout_buffer' description in 'drm_fb_dma_get_scanout_buffer'


vim +/drm_fb_dma_get_scanout_buffer +164 drivers/gpu/drm/drm_fb_dma_helper.c

   152	
   153	/**
   154	 * drm_fb_dma_get_scanout_buffer - Provide a scanout buffer in case of panic
   155	 * @plane: DRM primary plane
   156	 * @drm_scanout_buffer: scanout buffer for the panic handler
   157	 * Returns: 0 or negative error code
   158	 *
   159	 * Generic get_scanout_buffer() implementation, for drivers that uses the
   160	 * drm_fb_dma_helper. It won't call vmap in the panic context, so the driver
   161	 * should make sure the primary plane is vmapped, otherwise the panic screen
   162	 * won't get displayed.
   163	 */
 > 164	int drm_fb_dma_get_scanout_buffer(struct drm_plane *plane,
   165					  struct drm_scanout_buffer *sb)
 > 166	{

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