Hi Andrzej,

[FYI, it's a private test report for your RFC patch.]
[auto build test ERROR on next-20191122]
[also build test ERROR on v5.4-rc8]
[cannot apply to rockchip/for-next drm-exynos/exynos-drm-next linus/master v5.4-rc8 v5.4-rc7 v5.4-rc6]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Andrzej-Pietrasiewicz/AFBC-rework-and-support-for-Rockchip/20191124-080522
base:    b9d3d01405061bb42358fe53f824e894a1922ced
config: x86_64-randconfig-a001-20191124 (attached as .config)
compiler: gcc-7 (Debian 7.4.0-14) 7.4.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   ld: drivers/gpu/drm/drm_fourcc.o: in function `drm_get_format_info':
>> drivers/gpu/drm/drm_fourcc.c:327: undefined reference to `drm_is_afbc'
   ld: drivers/gpu/drm/drm_framebuffer.o: in function `framebuffer_check':
>> drivers/gpu/drm/drm_framebuffer.c:271: undefined reference to `drm_is_afbc'
   ld: drivers/gpu/drm/drm_framebuffer.o: in function `modifier_check':
   drivers/gpu/drm/drm_framebuffer.c:228: undefined reference to `drm_is_afbc'
   ld: drivers/gpu/drm/drm_framebuffer.o: in function `afbc_check':
>> drivers/gpu/drm/drm_framebuffer.c:190: undefined reference to `drm_afbc_get_superblk_wh'

vim +327 drivers/gpu/drm/drm_fourcc.c

   310	
   311	/**
   312	 * drm_get_format_info - query information for a given framebuffer configuration
   313	 * @dev: DRM device
   314	 * @mode_cmd: metadata from the userspace fb creation request
   315	 *
   316	 * Returns:
   317	 * The instance of struct drm_format_info that describes the pixel format, or
   318	 * NULL if the format is unsupported.
   319	 */
   320	const struct drm_format_info *
   321	drm_get_format_info(struct drm_device *dev,
   322			    const struct drm_mode_fb_cmd2 *mode_cmd)
   323	{
   324		const struct drm_format_info *info = NULL;
   325	
   326		/* bypass driver callback if afbc */
 > 327		if (!drm_is_afbc(mode_cmd->modifier[0]))
   328			if (dev->mode_config.funcs->get_format_info) {
   329				const struct drm_mode_config_funcs *funcs;
   330	
   331				funcs = dev->mode_config.funcs;
   332				info = funcs->get_format_info(mode_cmd);
   333			}
   334	
   335		if (!info)
   336			info = drm_format_info(mode_cmd->pixel_format);
   337	
   338		return info;
   339	}
   340	EXPORT_SYMBOL(drm_get_format_info);
   341	

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0-DAY kernel test infrastructure                 Open Source Technology Center
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