Re: [PATCH 2/7] fbdev: Do not include <linux/backlight.h> in header

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

Hi Thomas,

kernel test robot noticed the following build warnings:

[auto build test WARNING on drm-misc/drm-misc-next]
[also build test WARNING on linus/master v6.8-rc4 next-20240212]
[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/Thomas-Zimmermann/drm-nouveau-Include-linux-backlight-h/20240212-181930
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link:    https://lore.kernel.org/r/20240212101712.23675-3-tzimmermann%40suse.de
patch subject: [PATCH 2/7] fbdev: Do not include <linux/backlight.h> in header
config: powerpc-ppc6xx_defconfig (https://download.01.org/0day-ci/archive/20240213/202402131349.eg8DJ3MB-lkp@intel.com/config)
compiler: powerpc-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240213/202402131349.eg8DJ3MB-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/202402131349.eg8DJ3MB-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/macintosh/via-pmu-backlight.c: In function '__pmu_backlight_update_status':
   drivers/macintosh/via-pmu-backlight.c:74:21: error: implicit declaration of function 'backlight_get_brightness'; did you mean 'pmu_backlight_get_level_brightness'? [-Werror=implicit-function-declaration]
      74 |         int level = backlight_get_brightness(bd);
         |                     ^~~~~~~~~~~~~~~~~~~~~~~~
         |                     pmu_backlight_get_level_brightness
   drivers/macintosh/via-pmu-backlight.c: At top level:
   drivers/macintosh/via-pmu-backlight.c:108:21: error: variable 'pmu_backlight_data' has initializer but incomplete type
     108 | static const struct backlight_ops pmu_backlight_data = {
         |                     ^~~~~~~~~~~~~
   drivers/macintosh/via-pmu-backlight.c:109:10: error: 'const struct backlight_ops' has no member named 'update_status'
     109 |         .update_status  = pmu_backlight_update_status,
         |          ^~~~~~~~~~~~~
>> drivers/macintosh/via-pmu-backlight.c:109:27: warning: excess elements in struct initializer
     109 |         .update_status  = pmu_backlight_update_status,
         |                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/macintosh/via-pmu-backlight.c:109:27: note: (near initialization for 'pmu_backlight_data')
   drivers/macintosh/via-pmu-backlight.c: In function 'pmu_backlight_init':
   drivers/macintosh/via-pmu-backlight.c:136:37: error: storage size of 'props' isn't known
     136 |         struct backlight_properties props;
         |                                     ^~~~~
   drivers/macintosh/via-pmu-backlight.c:154:34: error: invalid application of 'sizeof' to incomplete type 'struct backlight_properties'
     154 |         memset(&props, 0, sizeof(struct backlight_properties));
         |                                  ^~~~~~
   drivers/macintosh/via-pmu-backlight.c:155:22: error: 'BACKLIGHT_PLATFORM' undeclared (first use in this function)
     155 |         props.type = BACKLIGHT_PLATFORM;
         |                      ^~~~~~~~~~~~~~~~~~
   drivers/macintosh/via-pmu-backlight.c:155:22: note: each undeclared identifier is reported only once for each function it appears in
   drivers/macintosh/via-pmu-backlight.c:157:14: error: implicit declaration of function 'backlight_device_register'; did you mean 'root_device_register'? [-Werror=implicit-function-declaration]
     157 |         bd = backlight_device_register(name, NULL, NULL, &pmu_backlight_data,
         |              ^~~~~~~~~~~~~~~~~~~~~~~~~
         |              root_device_register
   drivers/macintosh/via-pmu-backlight.c:166:19: error: invalid use of undefined type 'struct backlight_device'
     166 |         level = bd->props.max_brightness;
         |                   ^~
   drivers/macintosh/via-pmu-backlight.c:176:35: error: invalid use of undefined type 'struct backlight_device'
     176 |                                 bd->props.max_brightness / 15);
         |                                   ^~
   drivers/macintosh/via-pmu-backlight.c:179:11: error: invalid use of undefined type 'struct backlight_device'
     179 |         bd->props.brightness = level;
         |           ^~
   drivers/macintosh/via-pmu-backlight.c:180:11: error: invalid use of undefined type 'struct backlight_device'
     180 |         bd->props.power = FB_BLANK_UNBLANK;
         |           ^~
   drivers/macintosh/via-pmu-backlight.c:181:9: error: implicit declaration of function 'backlight_update_status'; did you mean 'pmu_backlight_update_status'? [-Werror=implicit-function-declaration]
     181 |         backlight_update_status(bd);
         |         ^~~~~~~~~~~~~~~~~~~~~~~
         |         pmu_backlight_update_status
>> drivers/macintosh/via-pmu-backlight.c:136:37: warning: unused variable 'props' [-Wunused-variable]
     136 |         struct backlight_properties props;
         |                                     ^~~~~
   drivers/macintosh/via-pmu-backlight.c: At top level:
   drivers/macintosh/via-pmu-backlight.c:108:35: error: storage size of 'pmu_backlight_data' isn't known
     108 | static const struct backlight_ops pmu_backlight_data = {
         |                                   ^~~~~~~~~~~~~~~~~~
   drivers/macintosh/via-pmu-backlight.c:108:35: error: storage size of 'pmu_backlight_data' isn't known
   cc1: some warnings being treated as errors


vim +109 drivers/macintosh/via-pmu-backlight.c

0094f2cdcfb6f2 Benjamin Herrenschmidt 2007-12-20  106  
0094f2cdcfb6f2 Benjamin Herrenschmidt 2007-12-20  107  
acc2472ed33fc5 Lionel Debroux         2010-11-16  108  static const struct backlight_ops pmu_backlight_data = {
5474c120aafe78 Michael Hanselmann     2006-06-25 @109  	.update_status	= pmu_backlight_update_status,
599a52d1262939 Richard Purdie         2007-02-10  110  
5474c120aafe78 Michael Hanselmann     2006-06-25  111  };
5474c120aafe78 Michael Hanselmann     2006-06-25  112  
4b755999d6e0c1 Michael Hanselmann     2006-07-30  113  #ifdef CONFIG_PM
d565dd3b0824b6 Benjamin Herrenschmidt 2006-08-31  114  void pmu_backlight_set_sleep(int sleep)
4b755999d6e0c1 Michael Hanselmann     2006-07-30  115  {
4b755999d6e0c1 Michael Hanselmann     2006-07-30  116  	unsigned long flags;
4b755999d6e0c1 Michael Hanselmann     2006-07-30  117  
4b755999d6e0c1 Michael Hanselmann     2006-07-30  118  	spin_lock_irqsave(&pmu_backlight_lock, flags);
d565dd3b0824b6 Benjamin Herrenschmidt 2006-08-31  119  	sleeping = sleep;
fa19d63488bd10 Benjamin Herrenschmidt 2008-03-03  120  	if (pmac_backlight && uses_pmu_bl) {
0094f2cdcfb6f2 Benjamin Herrenschmidt 2007-12-20  121  		if (sleep) {
0094f2cdcfb6f2 Benjamin Herrenschmidt 2007-12-20  122  			struct adb_request req;
0094f2cdcfb6f2 Benjamin Herrenschmidt 2007-12-20  123  
0094f2cdcfb6f2 Benjamin Herrenschmidt 2007-12-20  124  			pmu_request(&req, NULL, 2, PMU_POWER_CTRL,
0094f2cdcfb6f2 Benjamin Herrenschmidt 2007-12-20  125  				    PMU_POW_BACKLIGHT | PMU_POW_OFF);
0094f2cdcfb6f2 Benjamin Herrenschmidt 2007-12-20  126  			pmu_wait_complete(&req);
0094f2cdcfb6f2 Benjamin Herrenschmidt 2007-12-20  127  		} else
0094f2cdcfb6f2 Benjamin Herrenschmidt 2007-12-20  128  			__pmu_backlight_update_status(pmac_backlight);
0094f2cdcfb6f2 Benjamin Herrenschmidt 2007-12-20  129  	}
4b755999d6e0c1 Michael Hanselmann     2006-07-30  130  	spin_unlock_irqrestore(&pmu_backlight_lock, flags);
4b755999d6e0c1 Michael Hanselmann     2006-07-30  131  }
d565dd3b0824b6 Benjamin Herrenschmidt 2006-08-31  132  #endif /* CONFIG_PM */
4b755999d6e0c1 Michael Hanselmann     2006-07-30  133  
00f7b29f6e9b8a Mathieu Malaterre      2017-12-26  134  void __init pmu_backlight_init(void)
5474c120aafe78 Michael Hanselmann     2006-06-25  135  {
a19a6ee6cad2b2 Matthew Garrett        2010-02-17 @136  	struct backlight_properties props;

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