drivers/gpu/drm/vkms/vkms_configfs.c:625:5: warning: 'vkms_configfs_parse_next_format' defined but not used

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

tree:   https://github.com/intel-lab-lkp/linux/commits/Louis-Chauvet/drm-drm_mode_config-Add-helper-to-get-plane-type-name/20260807-092508
head:   c4c09a7274b7bb12e10957fc5da78e52e5bbf54d
commit: d799e044e269193685079d3260b0b0b33d17a237 drm/vkms: Introduce configfs for plane format
date:   7 days ago
config: x86_64-rhel-9.4-bpf (https://download.01.org/0day-ci/archive/20260814/202608141459.lTWy7nlR-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260814/202608141459.lTWy7nlR-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/202608141459.lTWy7nlR-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/vkms/vkms_configfs.c:625:5: warning: 'vkms_configfs_parse_next_format' defined but not used [-Wunused-function]
     625 | int vkms_configfs_parse_next_format(const char *page, const char *page_end, char **out)
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/vkms_configfs_parse_next_format +625 drivers/gpu/drm/vkms/vkms_configfs.c

   614	
   615	/**
   616	 * vkms_configfs_parse_next_format() - Parse the next format in page,
   617	 *				       skipping all non fourcc-related characters
   618	 * @page: page to search into
   619	 * @page_end: last character of the page
   620	 * @out: Output pointer, will point inside page
   621	 *
   622	 * Returns: size of the matched format, @out will point to the + or -
   623	 */
   624	VISIBLE_IF_KUNIT
 > 625	int vkms_configfs_parse_next_format(const char *page, const char *page_end, char **out)
   626	{
   627		int count = page - page_end;
   628		char *tmp_plus = strnchr(page, count, '+');
   629		char *tmp_minus = strnchr(page, count, '-');
   630	
   631		if (!tmp_plus && !tmp_minus)
   632			return 0;
   633		if (!tmp_plus)
   634			*out = tmp_minus;
   635		else if (!tmp_minus)
   636			*out = tmp_plus;
   637		else
   638			*out = min(tmp_plus, tmp_minus);
   639	
   640		char *end = *out + 1;
   641	
   642		while (end < page_end) {
   643			if (!isalnum(*end) && *end != '*')
   644				break;
   645			end++;
   646		}
   647	
   648		return end - *out;
   649	}
   650	EXPORT_SYMBOL_IF_KUNIT(vkms_configfs_parse_next_format);
   651	

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