[linux-next:master 12500/13075] drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm.c:138:15: warning: variable 'feature_support' set but not used

[linux-next:master 12500/13075] drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm.c:138:15: warning: variable 'feature_support' set but not used

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   3cdbc01c40e34c57697f8934f2727a88551696be
commit: b8fe56375f78835db47565d91ea9d21767fe3c08 [12500/13075] drm/amd/display: Refactor ABM feature
config: arm64-randconfig-r036-20230416 (https://download.01.org/0day-ci/archive/20230420/202304200812.6UqNDVZy-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project 437b7602e4a998220871de78afcb020b9c14a661)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=b8fe56375f78835db47565d91ea9d21767fe3c08
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout b8fe56375f78835db47565d91ea9d21767fe3c08
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/gpu/drm/amd/amdgpu/ drivers/gpu/drm/amd/display/dc/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202304200812.6UqNDVZy-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm.c:138:15: warning: variable 'feature_support' set but not used [-Wunused-but-set-variable]
           unsigned int feature_support;
                        ^
   1 warning generated.
--
>> drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:83:6: warning: no previous prototype for function 'dmub_abm_init' [-Wmissing-prototypes]
   void dmub_abm_init(struct abm *abm, uint32_t backlight)
        ^
   drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:83:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void dmub_abm_init(struct abm *abm, uint32_t backlight)
   ^
   static 
>> drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:124:14: warning: no previous prototype for function 'dmub_abm_get_current_backlight' [-Wmissing-prototypes]
   unsigned int dmub_abm_get_current_backlight(struct abm *abm)
                ^
   drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:124:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   unsigned int dmub_abm_get_current_backlight(struct abm *abm)
   ^
   static 
>> drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:135:14: warning: no previous prototype for function 'dmub_abm_get_target_backlight' [-Wmissing-prototypes]
   unsigned int dmub_abm_get_target_backlight(struct abm *abm)
                ^
   drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:135:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   unsigned int dmub_abm_get_target_backlight(struct abm *abm)
   ^
   static 
>> drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:146:6: warning: no previous prototype for function 'dmub_abm_set_level' [-Wmissing-prototypes]
   bool dmub_abm_set_level(struct abm *abm, uint32_t level, uint8_t panel_mask)
        ^
   drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:146:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   bool dmub_abm_set_level(struct abm *abm, uint32_t level, uint8_t panel_mask)
   ^
   static 
>> drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:167:6: warning: no previous prototype for function 'dmub_abm_set_ambient_level' [-Wmissing-prototypes]
   void dmub_abm_set_ambient_level(struct abm *abm, unsigned int ambient_lux, uint8_t panel_mask)
        ^
   drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:167:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void dmub_abm_set_ambient_level(struct abm *abm, unsigned int ambient_lux, uint8_t panel_mask)
   ^
   static 
>> drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:189:6: warning: no previous prototype for function 'dmub_abm_init_config' [-Wmissing-prototypes]
   void dmub_abm_init_config(struct abm *abm,
        ^
   drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:189:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void dmub_abm_init_config(struct abm *abm,
   ^
   static 
>> drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:221:6: warning: no previous prototype for function 'dmub_abm_set_pause' [-Wmissing-prototypes]
   bool dmub_abm_set_pause(struct abm *abm, bool pause, unsigned int panel_inst, unsigned int stream_inst)
        ^
   drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:221:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   bool dmub_abm_set_pause(struct abm *abm, bool pause, unsigned int panel_inst, unsigned int stream_inst)
   ^
   static 
>> drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:241:6: warning: no previous prototype for function 'dmub_abm_set_pipe' [-Wmissing-prototypes]
   bool dmub_abm_set_pipe(struct abm *abm, uint32_t otg_inst, uint32_t option, uint32_t panel_inst)
        ^
   drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:241:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   bool dmub_abm_set_pipe(struct abm *abm, uint32_t otg_inst, uint32_t option, uint32_t panel_inst)
   ^
   static 
>> drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:263:6: warning: no previous prototype for function 'dmub_abm_set_backlight_level' [-Wmissing-prototypes]
   bool dmub_abm_set_backlight_level(struct abm *abm,
        ^
   drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:263:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   bool dmub_abm_set_backlight_level(struct abm *abm,
   ^
   static 
   9 warnings generated.


vim +/feature_support +138 drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm.c

   133	
   134	static bool dmub_abm_set_event_ex(struct abm *abm, unsigned int full_screen, unsigned int video_mode,
   135			unsigned int hdr_mode, unsigned int panel_inst)
   136	{
   137		bool ret = false;
 > 138		unsigned int feature_support;
   139	
   140		feature_support = abm_feature_support(abm, panel_inst);
   141	
   142		return ret;
   143	}
   144	

-- 
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https://github.com/intel/lkp-tests