[PATCH] fbdev: udl: Make CONFIG_FB_DEVICE optional

[kernel test robot]

Hi Gonzalo,

kernel test robot noticed the following build warnings:

[auto build test WARNING on drm-misc/drm-misc-next]
[also build test WARNING on drm-tip/drm-tip linus/master v6.12-rc5 next-20241028]
[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/Gonzalo-Silvalde-Blanco/fbdev-udl-Make-CONFIG_FB_DEVICE-optional/20241025-172653
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link:    https://lore.kernel.org/r/20241025092538.38339-1-gonzalo.silvalde%40gmail.com
patch subject: [PATCH] fbdev: udl: Make CONFIG_FB_DEVICE optional
config: riscv-randconfig-r073-20241029 (https://download.01.org/0day-ci/archive/20241029/202410290452.XKXQkwp1-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 5886454669c3c9026f7f27eab13509dd0241f2d6)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241029/202410290452.XKXQkwp1-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/202410290452.XKXQkwp1-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/video/fbdev/udlfb.c:19:
   In file included from include/linux/usb.h:16:
   In file included from include/linux/interrupt.h:22:
   In file included from arch/riscv/include/asm/sections.h:9:
   In file included from include/linux/mm.h:2213:
   include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     518 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
>> drivers/video/fbdev/udlfb.c:1485:35: warning: unused variable 'edid_attr' [-Wunused-const-variable]
    1485 | static const struct bin_attribute edid_attr = {
         |                                   ^~~~~~~~~
>> drivers/video/fbdev/udlfb.c:1493:38: warning: unused variable 'fb_device_attrs' [-Wunused-const-variable]
    1493 | static const struct device_attribute fb_device_attrs[] = {
         |                                      ^~~~~~~~~~~~~~~
   3 warnings generated.

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for GET_FREE_REGION
   Depends on [n]: SPARSEMEM [=n]
   Selected by [m]:
   - RESOURCE_KUNIT_TEST [=m] && RUNTIME_TESTING_MENU [=y] && KUNIT [=m]


vim +/edid_attr +1485 drivers/video/fbdev/udlfb.c

7d9485e2c53caa drivers/staging/udlfb/udlfb.c Bernie Thompson    2010-02-15  1484  
598b2eedfc3fbe drivers/video/fbdev/udlfb.c   Bhumika Goyal      2017-08-18 @1485  static const struct bin_attribute edid_attr = {
7d9485e2c53caa drivers/staging/udlfb/udlfb.c Bernie Thompson    2010-02-15  1486  	.attr.name = "edid",
8ef8cc4fca4a92 drivers/staging/udlfb/udlfb.c Bernie Thompson    2010-09-05  1487  	.attr.mode = 0666,
b9f03a3cd06c6f drivers/video/udlfb.c         Paul Mundt         2011-01-06  1488  	.size = EDID_LENGTH,
7d9485e2c53caa drivers/staging/udlfb/udlfb.c Bernie Thompson    2010-02-15  1489  	.read = edid_show,
8ef8cc4fca4a92 drivers/staging/udlfb/udlfb.c Bernie Thompson    2010-09-05  1490  	.write = edid_store
7d9485e2c53caa drivers/staging/udlfb/udlfb.c Bernie Thompson    2010-02-15  1491  };
7d9485e2c53caa drivers/staging/udlfb/udlfb.c Bernie Thompson    2010-02-15  1492  
fa738a5c4b2a6b drivers/video/fbdev/udlfb.c   Ladislav Michl     2018-01-16 @1493  static const struct device_attribute fb_device_attrs[] = {
7d9485e2c53caa drivers/staging/udlfb/udlfb.c Bernie Thompson    2010-02-15  1494  	__ATTR_RO(metrics_bytes_rendered),
7d9485e2c53caa drivers/staging/udlfb/udlfb.c Bernie Thompson    2010-02-15  1495  	__ATTR_RO(metrics_bytes_identical),
7d9485e2c53caa drivers/staging/udlfb/udlfb.c Bernie Thompson    2010-02-15  1496  	__ATTR_RO(metrics_bytes_sent),
7d9485e2c53caa drivers/staging/udlfb/udlfb.c Bernie Thompson    2010-02-15  1497  	__ATTR_RO(metrics_cpu_kcycles_used),
926c11151e3b82 drivers/staging/udlfb/udlfb.c Greg Kroah-Hartman 2010-11-18  1498  	__ATTR(metrics_reset, S_IWUSR, NULL, metrics_reset_store),
7d9485e2c53caa drivers/staging/udlfb/udlfb.c Bernie Thompson    2010-02-15  1499  };
7d9485e2c53caa drivers/staging/udlfb/udlfb.c Bernie Thompson    2010-02-15  1500  

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