Messages in this thread | | | Date | Tue, 7 Dec 2021 17:16:03 +0800 | Subject | drivers/gpu/drm/amd/amdgpu/../display/dc/dcn31/dcn31_apg.c:124:2: warning: Value stored to 'speakers' is never read [clang-analyzer-deadcode.DeadStores] | From | kernel test robot <> |
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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: d58071a8a76d779eedab38033ae4c821c30295a5 commit: 61452908a79ec936660494fb4b9f2a35ee42e6e0 drm/amd/display: Add DP 2.0 Audio Package Generator date: 3 months ago config: x86_64-randconfig-c007-20211128 (https://download.01.org/0day-ci/archive/20211130/202111300439.S9nMj4kS-lkp@intel.com/config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 5162b558d8c0b542e752b037e72a69d5fd51eb1e) 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=61452908a79ec936660494fb4b9f2a35ee42e6e0 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 61452908a79ec936660494fb4b9f2a35ee42e6e0 # save the config file to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 clang-analyzer
If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@intel.com>
clang-analyzer warnings: (new ones prefixed by >>)
>> drivers/gpu/drm/amd/amdgpu/../display/dc/dcn31/dcn31_apg.c:124:2: warning: Value stored to 'speakers' is never read [clang-analyzer-deadcode.DeadStores] speakers = audio_info->flags.info.ALLSPEAKERS; ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/gpu/drm/amd/amdgpu/../display/dc/dcn31/dcn31_apg.c:125:2: warning: Value stored to 'channels' is never read [clang-analyzer-deadcode.DeadStores] channels = speakers_to_channels(audio_info->flags.speaker_flags).all; ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
vim +/speakers +124 drivers/gpu/drm/amd/amdgpu/../display/dc/dcn31/dcn31_apg.c
61452908a79ec9 Fangzhi Zuo 2021-06-09 108 61452908a79ec9 Fangzhi Zuo 2021-06-09 109 static void apg31_se_audio_setup( 61452908a79ec9 Fangzhi Zuo 2021-06-09 110 struct apg *apg, 61452908a79ec9 Fangzhi Zuo 2021-06-09 111 unsigned int az_inst, 61452908a79ec9 Fangzhi Zuo 2021-06-09 112 struct audio_info *audio_info) 61452908a79ec9 Fangzhi Zuo 2021-06-09 113 { 61452908a79ec9 Fangzhi Zuo 2021-06-09 114 struct dcn31_apg *apg31 = DCN31_APG_FROM_APG(apg); 61452908a79ec9 Fangzhi Zuo 2021-06-09 115 61452908a79ec9 Fangzhi Zuo 2021-06-09 116 uint32_t speakers = 0; 61452908a79ec9 Fangzhi Zuo 2021-06-09 117 uint32_t channels = 0; 61452908a79ec9 Fangzhi Zuo 2021-06-09 118 61452908a79ec9 Fangzhi Zuo 2021-06-09 119 ASSERT(audio_info); 61452908a79ec9 Fangzhi Zuo 2021-06-09 120 /* This should not happen.it does so we don't get BSOD*/ 61452908a79ec9 Fangzhi Zuo 2021-06-09 121 if (audio_info == NULL) 61452908a79ec9 Fangzhi Zuo 2021-06-09 122 return; 61452908a79ec9 Fangzhi Zuo 2021-06-09 123 61452908a79ec9 Fangzhi Zuo 2021-06-09 @124 speakers = audio_info->flags.info.ALLSPEAKERS; 61452908a79ec9 Fangzhi Zuo 2021-06-09 @125 channels = speakers_to_channels(audio_info->flags.speaker_flags).all; 61452908a79ec9 Fangzhi Zuo 2021-06-09 126 61452908a79ec9 Fangzhi Zuo 2021-06-09 127 /* DisplayPort only allows for one audio stream with stream ID 0 */ 61452908a79ec9 Fangzhi Zuo 2021-06-09 128 REG_UPDATE(APG_CONTROL2, APG_DP_AUDIO_STREAM_ID, 0); 61452908a79ec9 Fangzhi Zuo 2021-06-09 129 61452908a79ec9 Fangzhi Zuo 2021-06-09 130 /* When running in "pair mode", pairs of audio channels have their own enable 61452908a79ec9 Fangzhi Zuo 2021-06-09 131 * this is for really old audio drivers */ 61452908a79ec9 Fangzhi Zuo 2021-06-09 132 REG_UPDATE(APG_DBG_GEN_CONTROL, APG_DBG_AUDIO_CHANNEL_ENABLE, 0xF); 61452908a79ec9 Fangzhi Zuo 2021-06-09 133 // REG_UPDATE(APG_DBG_GEN_CONTROL, APG_DBG_AUDIO_CHANNEL_ENABLE, channels); 61452908a79ec9 Fangzhi Zuo 2021-06-09 134 61452908a79ec9 Fangzhi Zuo 2021-06-09 135 /* Disable forced mem power off */ 61452908a79ec9 Fangzhi Zuo 2021-06-09 136 REG_UPDATE(APG_MEM_PWR, APG_MEM_PWR_FORCE, 0); 61452908a79ec9 Fangzhi Zuo 2021-06-09 137 61452908a79ec9 Fangzhi Zuo 2021-06-09 138 apg31_enable(apg); 61452908a79ec9 Fangzhi Zuo 2021-06-09 139 } 61452908a79ec9 Fangzhi Zuo 2021-06-09 140
--- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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