linux-kernel - drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_resource.c:1617:6: warning: no previous prototype for 'is_timing

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Date:   Mon, 28 Mar 2022 04:09:09 +0800
From:   kernel test robot <lkp@...el.com>
To:     Roman Li <Roman.Li@....com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Alex Deucher <alexander.deucher@....com>,
        Hersen Wu <hersenwu@....com>
Subject: drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_resource.c:1617:6:
 warning: no previous prototype for 'is_timing_changed'

Hi Roman,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   7001052160d172f6de06adeffde24dde9935ece8
commit: 17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b drm/amd/display: Add dsc pre-validation in atomic check
date:   6 weeks ago
config: arc-randconfig-r003-20220327 (https://download.01.org/0day-ci/archive/20220328/202203280415.IGMBaNAP-lkp@intel.com/config)
compiler: arceb-elf-gcc (GCC) 11.2.0
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
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arc SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_resource.c:1617:6: warning: no previous prototype for 'is_timing_changed' [-Wmissing-prototypes]
    1617 | bool is_timing_changed(struct dc_stream_state *cur_stream,
         |      ^~~~~~~~~~~~~~~~~
   In file included from drivers/gpu/drm/amd/amdgpu/../display/dc/inc/core_types.h:32,
                    from drivers/gpu/drm/amd/amdgpu/../display/dc/inc/resource.h:28,
                    from drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_resource.c:30:
   drivers/gpu/drm/amd/amdgpu/../display/include/ddc_service_types.h:127:22: warning: 'SYNAPTICS_DEVICE_ID' defined but not used [-Wunused-const-variable=]
     127 | static const uint8_t SYNAPTICS_DEVICE_ID[] = "SYNA";
         |                      ^~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../display/include/ddc_service_types.h:124:22: warning: 'DP_SINK_DEVICE_STR_ID_2' defined but not used [-Wunused-const-variable=]
     124 | static const uint8_t DP_SINK_DEVICE_STR_ID_2[] = {7, 1, 8, 7, 5, 0};
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../display/include/ddc_service_types.h:123:22: warning: 'DP_SINK_DEVICE_STR_ID_1' defined but not used [-Wunused-const-variable=]
     123 | static const uint8_t DP_SINK_DEVICE_STR_ID_1[] = {7, 1, 8, 7, 3, 0};
         |                      ^~~~~~~~~~~~~~~~~~~~~~~


vim +/is_timing_changed +1617 drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_resource.c

  1616	
> 1617	bool is_timing_changed(struct dc_stream_state *cur_stream,
  1618			       struct dc_stream_state *new_stream)
  1619	{
  1620		if (cur_stream == NULL)
  1621			return true;
  1622	
  1623		/* If output color space is changed, need to reprogram info frames */
  1624		if (cur_stream->output_color_space != new_stream->output_color_space)
  1625			return true;
  1626	
  1627		return memcmp(
  1628			&cur_stream->timing,
  1629			&new_stream->timing,
  1630			sizeof(struct dc_crtc_timing)) != 0;
  1631	}
  1632	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp