Hi Florian,

kernel test robot noticed the following build errors:

[auto build test ERROR on drm-misc/drm-misc-next]
[also build test ERROR on drm-tip/drm-tip linus/master v6.9-rc6 next-20240503]
[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/Florian-Fainelli/fbdev-Have-CONFIG_FB_NOTIFY-be-tristate/20240504-033139
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link:    
https://lore.kernel.org/r/20240503192858.103640-1-florian.fainelli%40broadcom.com
patch subject: [PATCH] fbdev: Have CONFIG_FB_NOTIFY be tristate
config: i386-randconfig-015-20240504 
(https://download.01.org/0day-ci/archive/20240504/202405042242.ixldu4xj-...@intel.com/config)
compiler: gcc-13 (Ubuntu 13.2.0-4ubuntu3) 13.2.0
reproduce (this is a W=1 build): 
(https://download.01.org/0day-ci/archive/20240504/202405042242.ixldu4xj-...@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 <l...@intel.com>
| Closes: 
https://lore.kernel.org/oe-kbuild-all/202405042242.ixldu4xj-...@intel.com/

All errors (new ones prefixed by >>):

   ld: drivers/leds/trigger/ledtrig-backlight.o: in function 
`bl_trig_deactivate':
>> drivers/leds/trigger/ledtrig-backlight.c:128:(.text+0x136): undefined 
>> reference to `fb_unregister_client'
   ld: drivers/leds/trigger/ledtrig-backlight.o: in function `bl_trig_activate':
>> drivers/leds/trigger/ledtrig-backlight.c:117:(.text+0x1aa): undefined 
>> reference to `fb_register_client'


vim +128 drivers/leds/trigger/ledtrig-backlight.c

e4786ba0db7b11 drivers/leds/trigger/ledtrig-backlight.c Uwe Kleine-König   
2018-07-02  100  
2282e125a406e0 drivers/leds/trigger/ledtrig-backlight.c Uwe Kleine-König   
2018-07-02  101  static int bl_trig_activate(struct led_classdev *led)
132e9306beedd0 drivers/leds/ledtrig-backlight.c         Rodolfo Giometti   
2008-10-13  102  {
132e9306beedd0 drivers/leds/ledtrig-backlight.c         Rodolfo Giometti   
2008-10-13  103      int ret;
132e9306beedd0 drivers/leds/ledtrig-backlight.c         Rodolfo Giometti   
2008-10-13  104  
132e9306beedd0 drivers/leds/ledtrig-backlight.c         Rodolfo Giometti   
2008-10-13  105      struct bl_trig_notifier *n;
132e9306beedd0 drivers/leds/ledtrig-backlight.c         Rodolfo Giometti   
2008-10-13  106  
132e9306beedd0 drivers/leds/ledtrig-backlight.c         Rodolfo Giometti   
2008-10-13  107      n = kzalloc(sizeof(struct bl_trig_notifier), GFP_KERNEL);
e4786ba0db7b11 drivers/leds/trigger/ledtrig-backlight.c Uwe Kleine-König   
2018-07-02  108      if (!n)
e4786ba0db7b11 drivers/leds/trigger/ledtrig-backlight.c Uwe Kleine-König   
2018-07-02  109              return -ENOMEM;
e4786ba0db7b11 drivers/leds/trigger/ledtrig-backlight.c Uwe Kleine-König   
2018-07-02  110      led_set_trigger_data(led, n);
9f9455ae710786 drivers/leds/ledtrig-backlight.c         Janusz Krzysztofik 
2011-01-12  111  
132e9306beedd0 drivers/leds/ledtrig-backlight.c         Rodolfo Giometti   
2008-10-13  112      n->led = led;
132e9306beedd0 drivers/leds/ledtrig-backlight.c         Rodolfo Giometti   
2008-10-13  113      n->brightness = led->brightness;
132e9306beedd0 drivers/leds/ledtrig-backlight.c         Rodolfo Giometti   
2008-10-13  114      n->old_status = UNBLANK;
132e9306beedd0 drivers/leds/ledtrig-backlight.c         Rodolfo Giometti   
2008-10-13  115      n->notifier.notifier_call = fb_notifier_callback;
132e9306beedd0 drivers/leds/ledtrig-backlight.c         Rodolfo Giometti   
2008-10-13  116  
132e9306beedd0 drivers/leds/ledtrig-backlight.c         Rodolfo Giometti   
2008-10-13 @117      ret = fb_register_client(&n->notifier);
132e9306beedd0 drivers/leds/ledtrig-backlight.c         Rodolfo Giometti   
2008-10-13  118      if (ret)
132e9306beedd0 drivers/leds/ledtrig-backlight.c         Rodolfo Giometti   
2008-10-13  119              dev_err(led->dev, "unable to register backlight 
trigger\n");
2282e125a406e0 drivers/leds/trigger/ledtrig-backlight.c Uwe Kleine-König   
2018-07-02  120  
2282e125a406e0 drivers/leds/trigger/ledtrig-backlight.c Uwe Kleine-König   
2018-07-02  121      return 0;
132e9306beedd0 drivers/leds/ledtrig-backlight.c         Rodolfo Giometti   
2008-10-13  122  }
132e9306beedd0 drivers/leds/ledtrig-backlight.c         Rodolfo Giometti   
2008-10-13  123  
132e9306beedd0 drivers/leds/ledtrig-backlight.c         Rodolfo Giometti   
2008-10-13  124  static void bl_trig_deactivate(struct led_classdev *led)
132e9306beedd0 drivers/leds/ledtrig-backlight.c         Rodolfo Giometti   
2008-10-13  125  {
e4786ba0db7b11 drivers/leds/trigger/ledtrig-backlight.c Uwe Kleine-König   
2018-07-02  126      struct bl_trig_notifier *n = led_get_trigger_data(led);
132e9306beedd0 drivers/leds/ledtrig-backlight.c         Rodolfo Giometti   
2008-10-13  127  
132e9306beedd0 drivers/leds/ledtrig-backlight.c         Rodolfo Giometti   
2008-10-13 @128      fb_unregister_client(&n->notifier);
132e9306beedd0 drivers/leds/ledtrig-backlight.c         Rodolfo Giometti   
2008-10-13  129      kfree(n);
132e9306beedd0 drivers/leds/ledtrig-backlight.c         Rodolfo Giometti   
2008-10-13  130  }
132e9306beedd0 drivers/leds/ledtrig-backlight.c         Rodolfo Giometti   
2008-10-13  131  

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0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

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