linux-kernel - drivers/gpu/drm/amd/amdgpu/../display/dc/dcn201/dcn201_init.c:127:6: warning: no previous prototype for 'dcn201_hw_sequencer

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Date:   Sun, 27 Mar 2022 06:46:37 +0800
From:   kernel test robot <lkp@...el.com>
To:     Alex Deucher <alexander.deucher@....com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Zhan Liu <zhan.liu@....com>
Subject: drivers/gpu/drm/amd/amdgpu/../display/dc/dcn201/dcn201_init.c:127:6:
 warning: no previous prototype for 'dcn201_hw_sequencer_construct'

Hi Alex,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   710f5d627a98e86f821aceb840b8f2f1fcc6cf75
commit: 519607a2f7798decb9c891a4f706aaf780f5a677 drm/amdgpu/display: fold DRM_AMD_DC_DCN201 into DRM_AMD_DC_DCN
date:   6 months ago
config: powerpc64-randconfig-r015-20220325 (https://download.01.org/0day-ci/archive/20220327/202203270623.MEZulKy5-lkp@intel.com/config)
compiler: powerpc64-linux-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=519607a2f7798decb9c891a4f706aaf780f5a677
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 519607a2f7798decb9c891a4f706aaf780f5a677
        # 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=powerpc SHELL=/bin/bash drivers/gpu/drm/

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/dcn201/dcn201_init.c:127:6: warning: no previous prototype for 'dcn201_hw_sequencer_construct' [-Wmissing-prototypes]
     127 | void dcn201_hw_sequencer_construct(struct dc *dc)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
--
   drivers/gpu/drm/amd/amdgpu/../display/dc/dcn201/dcn201_hwseq.c: In function 'gpu_addr_to_uma':
>> drivers/gpu/drm/amd/amdgpu/../display/dc/dcn201/dcn201_hwseq.c:88:14: warning: variable 'is_in_uma' set but not used [-Wunused-but-set-variable]
      88 |         bool is_in_uma;
         |              ^~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../display/dc/dcn201/dcn201_hwseq.c: In function 'dcn201_pipe_control_lock':
>> drivers/gpu/drm/amd/amdgpu/../display/dc/dcn201/dcn201_hwseq.c:544:22: warning: variable 'hubp' set but not used [-Wunused-but-set-variable]
     544 |         struct hubp *hubp = NULL;
         |                      ^~~~
--
   drivers/gpu/drm/amd/amdgpu/../display/dc/dcn201/dcn201_dpp.c: In function 'dpp201_get_optimal_number_of_taps':
>> drivers/gpu/drm/amd/amdgpu/../display/dc/dcn201/dcn201_dpp.c:185:18: warning: variable 'pixel_width' set but not used [-Wunused-but-set-variable]
     185 |         uint32_t pixel_width;
         |                  ^~~~~~~~~~~


vim +/dcn201_hw_sequencer_construct +127 drivers/gpu/drm/amd/amdgpu/../display/dc/dcn201/dcn201_init.c

3f68c01be9a222 Zhan Liu 2021-09-25  126  
3f68c01be9a222 Zhan Liu 2021-09-25 @127  void dcn201_hw_sequencer_construct(struct dc *dc)

:::::: The code at line 127 was first introduced by commit
:::::: 3f68c01be9a2227de1e190317fe34a6fb835a094 drm/amd/display: add cyan_skillfish display support

:::::: TO: Zhan Liu <zhan.liu@....com>
:::::: CC: Alex Deucher <alexander.deucher@....com>

-- 
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