[PATCH 2/4] drm/i915/display: add intel_display_snapshot abstraction

[kernel test robot]

Hi Jani,

kernel test robot noticed the following build errors:

[auto build test ERROR on drm-intel/for-linux-next]
[also build test ERROR on next-20240904]
[cannot apply to drm-intel/for-linux-next-fixes drm-tip/drm-tip linus/master v6.11-rc6]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Jani-Nikula/drm-i915-dump-display-parameters-captured-in-error-state-not-current/20240903-220614
base:   git://anongit.freedesktop.org/drm-intel for-linux-next
patch link:    https://lore.kernel.org/r/f2cc41111504e062c3ecb287daee6967078b73cc.1725372032.git.jani.nikula%40intel.com
patch subject: [PATCH 2/4] drm/i915/display: add intel_display_snapshot abstraction
config: i386-randconfig-005-20240904 (https://download.01.org/0day-ci/archive/20240904/202409042024.IZDvOogv-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240904/202409042024.IZDvOogv-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202409042024.IZDvOogv-lkp@intel.com/

All errors (new ones prefixed by >>):

   ld: drivers/gpu/drm/i915/display/intel_display_snapshot.o: in function `intel_display_snapshot_capture':
>> drivers/gpu/drm/i915/display/intel_display_snapshot.c:21: undefined reference to `intel_overlay_snapshot_capture'
   ld: drivers/gpu/drm/i915/display/intel_display_snapshot.o: in function `intel_display_snapshot_print':
>> drivers/gpu/drm/i915/display/intel_display_snapshot.c:32: undefined reference to `intel_overlay_snapshot_print'


vim +21 drivers/gpu/drm/i915/display/intel_display_snapshot.c

    12	
    13	struct intel_display_snapshot *intel_display_snapshot_capture(struct intel_display *display)
    14	{
    15		struct intel_display_snapshot *snapshot;
    16	
    17		snapshot = kzalloc(sizeof(*snapshot), GFP_ATOMIC);
    18		if (!snapshot)
    19			return NULL;
    20	
  > 21		snapshot->overlay = intel_overlay_snapshot_capture(display);
    22	
    23		return snapshot;
    24	}
    25	
    26	void intel_display_snapshot_print(const struct intel_display_snapshot *snapshot,
    27					  struct drm_printer *p)
    28	{
    29		if (!snapshot)
    30			return;
    31	
  > 32		intel_overlay_snapshot_print(snapshot->overlay, p);
    33	}
    34	

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