linux-kernel - drivers/gpu/drm/amd/amdgpu/../pm/swsmu/amdgpu_smu.c:1355:6: warning: variable 'num_of_active

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Date:   Fri, 25 Mar 2022 13:50:52 +0800
From:   kernel test robot <lkp@...el.com>
To:     Alex Deucher <alexander.deucher@....com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, Evan Quan <evan.quan@....com>
Subject: drivers/gpu/drm/amd/amdgpu/../pm/swsmu/amdgpu_smu.c:1355:6: warning:
 variable 'num_of_active_display' set but not used

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   85c7000fda0029ec16569b1eec8fd3a8d026be73
commit: 75145aab7a0d865b361de687b201e8c4b76425eb drm/amdgpu/swsmu: clean up a bunch of stale interfaces
date:   1 year, 5 months ago
config: arm64-randconfig-r013-20220324 (https://download.01.org/0day-ci/archive/20220325/202203251309.VJH4ngVX-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 0f6d9501cf49ce02937099350d08f20c4af86f3d)
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
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=75145aab7a0d865b361de687b201e8c4b76425eb
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 75145aab7a0d865b361de687b201e8c4b76425eb
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 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/../pm/swsmu/amdgpu_smu.c:1355:6: warning: variable 'num_of_active_display' set but not used [-Wunused-but-set-variable]
           int num_of_active_display = 0;
               ^
   1 warning generated.


vim +/num_of_active_display +1355 drivers/gpu/drm/amd/amdgpu/../pm/swsmu/amdgpu_smu.c

137d63abbf6a085 drivers/gpu/drm/amd/powerplay/amdgpu_smu.c Huang Rui 2018-11-29  1350  
94ed6d0cfdb867b drivers/gpu/drm/amd/powerplay/amdgpu_smu.c Huang Rui 2019-01-11  1351  int smu_display_configuration_change(struct smu_context *smu,
94ed6d0cfdb867b drivers/gpu/drm/amd/powerplay/amdgpu_smu.c Huang Rui 2019-01-11  1352  				     const struct amd_pp_display_configuration *display_config)
94ed6d0cfdb867b drivers/gpu/drm/amd/powerplay/amdgpu_smu.c Huang Rui 2019-01-11  1353  {
94ed6d0cfdb867b drivers/gpu/drm/amd/powerplay/amdgpu_smu.c Huang Rui 2019-01-11  1354  	int index = 0;
94ed6d0cfdb867b drivers/gpu/drm/amd/powerplay/amdgpu_smu.c Huang Rui 2019-01-11 @1355  	int num_of_active_display = 0;
94ed6d0cfdb867b drivers/gpu/drm/amd/powerplay/amdgpu_smu.c Huang Rui 2019-01-11  1356  
2b7ad277e96577e drivers/gpu/drm/amd/powerplay/amdgpu_smu.c Evan Quan 2020-05-25  1357  	if (!smu->pm_enabled || !smu->adev->pm.dpm_enabled)
2b7ad277e96577e drivers/gpu/drm/amd/powerplay/amdgpu_smu.c Evan Quan 2020-05-25  1358  		return -EOPNOTSUPP;
94ed6d0cfdb867b drivers/gpu/drm/amd/powerplay/amdgpu_smu.c Huang Rui 2019-01-11  1359  
94ed6d0cfdb867b drivers/gpu/drm/amd/powerplay/amdgpu_smu.c Huang Rui 2019-01-11  1360  	if (!display_config)
94ed6d0cfdb867b drivers/gpu/drm/amd/powerplay/amdgpu_smu.c Huang Rui 2019-01-11  1361  		return -EINVAL;
94ed6d0cfdb867b drivers/gpu/drm/amd/powerplay/amdgpu_smu.c Huang Rui 2019-01-11  1362  
94ed6d0cfdb867b drivers/gpu/drm/amd/powerplay/amdgpu_smu.c Huang Rui 2019-01-11  1363  	mutex_lock(&smu->mutex);
94ed6d0cfdb867b drivers/gpu/drm/amd/powerplay/amdgpu_smu.c Huang Rui 2019-01-11  1364  
ce63d8f8b55d28c drivers/gpu/drm/amd/powerplay/amdgpu_smu.c Evan Quan 2020-06-08  1365  	smu_set_min_dcef_deep_sleep(smu,
94ed6d0cfdb867b drivers/gpu/drm/amd/powerplay/amdgpu_smu.c Huang Rui 2019-01-11  1366  				    display_config->min_dcef_deep_sleep_set_clk / 100);
94ed6d0cfdb867b drivers/gpu/drm/amd/powerplay/amdgpu_smu.c Huang Rui 2019-01-11  1367  
94ed6d0cfdb867b drivers/gpu/drm/amd/powerplay/amdgpu_smu.c Huang Rui 2019-01-11  1368  	for (index = 0; index < display_config->num_path_including_non_display; index++) {
94ed6d0cfdb867b drivers/gpu/drm/amd/powerplay/amdgpu_smu.c Huang Rui 2019-01-11  1369  		if (display_config->displays[index].controller_id != 0)
94ed6d0cfdb867b drivers/gpu/drm/amd/powerplay/amdgpu_smu.c Huang Rui 2019-01-11  1370  			num_of_active_display++;
94ed6d0cfdb867b drivers/gpu/drm/amd/powerplay/amdgpu_smu.c Huang Rui 2019-01-11  1371  	}
94ed6d0cfdb867b drivers/gpu/drm/amd/powerplay/amdgpu_smu.c Huang Rui 2019-01-11  1372  
94ed6d0cfdb867b drivers/gpu/drm/amd/powerplay/amdgpu_smu.c Huang Rui 2019-01-11  1373  	mutex_unlock(&smu->mutex);
94ed6d0cfdb867b drivers/gpu/drm/amd/powerplay/amdgpu_smu.c Huang Rui 2019-01-11  1374  
94ed6d0cfdb867b drivers/gpu/drm/amd/powerplay/amdgpu_smu.c Huang Rui 2019-01-11  1375  	return 0;
94ed6d0cfdb867b drivers/gpu/drm/amd/powerplay/amdgpu_smu.c Huang Rui 2019-01-11  1376  }
94ed6d0cfdb867b drivers/gpu/drm/amd/powerplay/amdgpu_smu.c Huang Rui 2019-01-11  1377  

:::::: The code at line 1355 was first introduced by commit
:::::: 94ed6d0cfdb867be9bf05f03d682980bce5d0036 drm/amd/powerplay: add smu display configuration change function

:::::: TO: Huang Rui <ray.huang@....com>
:::::: CC: Alex Deucher <alexander.deucher@....com>

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