* 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]
[not found] <202111300439.S9nMj4kS-lkp@intel.com>
@ 2021-12-07 9:16 ` kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2021-12-07 9:16 UTC (permalink / raw)
To: Fangzhi Zuo
Cc: llvm, kbuild-all, Linux Kernel Mailing List, Alex Deucher,
Nicholas Kazlauskas
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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