[PATCH v3] drm/vkms: Add support to 1D gamma LUT

[kernel test robot]

Hi Arthur,

kernel test robot noticed the following build warnings:

[auto build test WARNING on drm-misc/drm-misc-next]
[also build test WARNING on drm/drm-next drm-exynos/exynos-drm-next drm-intel/for-linux-next drm-intel/for-linux-next-fixes drm-tip/drm-tip linus/master v6.4-rc6 next-20230615]
[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/Arthur-Grillo/drm-vkms-Add-support-to-1D-gamma-LUT/20230616-040349
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link:    https://lore.kernel.org/r/20230615200157.960630-1-arthurgrillo%40riseup.net
patch subject: [PATCH v3] drm/vkms: Add support to 1D gamma LUT
config: alpha-allyesconfig (https://download.01.org/0day-ci/archive/20230616/202306160524.qcbF0KNr-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 12.3.0
reproduce (this is a W=1 build):
        mkdir -p ~/bin
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git remote add drm-misc git://anongit.freedesktop.org/drm/drm-misc
        git fetch drm-misc drm-misc-next
        git checkout drm-misc/drm-misc-next
        b4 shazam https://lore.kernel.org/r/20230615200157.960630-1-arthurgrillo@riseup.net
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.3.0 ~/bin/make.cross W=1 O=build_dir ARCH=alpha olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.3.0 ~/bin/make.cross W=1 O=build_dir ARCH=alpha SHELL=/bin/bash drivers/gpu/

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/202306160524.qcbF0KNr-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/gpu/drm/vkms/vkms_crtc.c: In function 'vkms_crtc_atomic_flush':
>> drivers/gpu/drm/vkms/vkms_crtc.c:251:32: warning: variable 'gamma_lut' set but not used [-Wunused-but-set-variable]
     251 |         struct vkms_color_lut *gamma_lut;
         |                                ^~~~~~~~~


vim +/gamma_lut +251 drivers/gpu/drm/vkms/vkms_crtc.c

   246	
   247	static void vkms_crtc_atomic_flush(struct drm_crtc *crtc,
   248					   struct drm_atomic_state *state)
   249	{
   250		struct vkms_output *vkms_output = drm_crtc_to_vkms_output(crtc);
 > 251		struct vkms_color_lut *gamma_lut;
   252	
   253		if (crtc->state->event) {
   254			spin_lock(&crtc->dev->event_lock);
   255	
   256			if (drm_crtc_vblank_get(crtc) != 0)
   257				drm_crtc_send_vblank_event(crtc, crtc->state->event);
   258			else
   259				drm_crtc_arm_vblank_event(crtc, crtc->state->event);
   260	
   261			spin_unlock(&crtc->dev->event_lock);
   262	
   263			crtc->state->event = NULL;
   264		}
   265	
   266		vkms_output->composer_state = to_vkms_crtc_state(crtc->state);
   267		gamma_lut = &vkms_output->composer_state->gamma_lut;
   268	
   269		spin_unlock_irq(&vkms_output->lock);
   270	}
   271	

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