Re: [RFC PATCH v3 04/23] drm/vkms: Add kunit tests for VKMS LUT handling

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

Hi Harry,

[This is a private test report for your RFC patch.]
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 v6.6 next-20231109]
[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/Harry-Wentland/drm-Don-t-treat-0-as-1-in-drm_fixp2int_ceil/20231109-024233
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link:    https://lore.kernel.org/r/20231108163647.106853-5-harry.wentland%40amd.com
patch subject: [RFC PATCH v3 04/23] drm/vkms: Add kunit tests for VKMS LUT handling
config: loongarch-randconfig-001-20231109 (https://download.01.org/0day-ci/archive/20231109/202311091611.VVosXT9n-lkp@intel.com/config)
compiler: loongarch64-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231109/202311091611.VVosXT9n-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/202311091611.VVosXT9n-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/vkms/vkms_composer.c:94:5: warning: no previous prototype for 'lerp_u16' [-Wmissing-prototypes]
      94 | u16 lerp_u16(u16 a, u16 b, s64 t)
         |     ^~~~~~~~
>> drivers/gpu/drm/vkms/vkms_composer.c:104:5: warning: no previous prototype for 'get_lut_index' [-Wmissing-prototypes]
     104 | s64 get_lut_index(const struct vkms_color_lut *lut, u16 channel_value)
         |     ^~~~~~~~~~~~~


vim +/lerp_u16 +94 drivers/gpu/drm/vkms/vkms_composer.c

    92	
    93	// lerp(a, b, t) = a + (b - a) * t
  > 94	u16 lerp_u16(u16 a, u16 b, s64 t)
    95	{
    96		s64 a_fp = drm_int2fixp(a);
    97		s64 b_fp = drm_int2fixp(b);
    98	
    99		s64 delta = drm_fixp_mul(b_fp - a_fp,  t);
   100	
   101		return drm_fixp2int(a_fp + delta);
   102	}
   103	
 > 104	s64 get_lut_index(const struct vkms_color_lut *lut, u16 channel_value)
   105	{
   106		s64 color_channel_fp = drm_int2fixp(channel_value);
   107	
   108		return drm_fixp_mul(color_channel_fp, lut->channel_value2index_ratio);
   109	}
   110	

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