linux-kernel - drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c:236:3: warning: variable 'usage' is uninitialized when used here

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Date:   Tue, 28 Sep 2021 08:25:13 +0800
From:   kernel test robot <lkp@...el.com>
To:     Arunpravin <Arunpravin.PaneerSelvam@....com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, 0day robot <lkp@...el.com>
Subject: drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c:236:3: warning:
 variable 'usage' is uninitialized when used here

tree:   https://github.com/0day-ci/linux/commits/Arunpravin/Enable-buddy-memory-manager-support/20210921-032602
head:   71b3775a5ce7b59e8c5292ae438284e8569c9e9f
commit: 71b3775a5ce7b59e8c5292ae438284e8569c9e9f Add drm buddy manager support to amdgpu driver
date:   7 days ago
config: x86_64-randconfig-a014-20210927 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project dc6e8dfdfe7efecfda318d43a06fae18b40eb498)
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://github.com/0day-ci/linux/commit/71b3775a5ce7b59e8c5292ae438284e8569c9e9f
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Arunpravin/Enable-buddy-memory-manager-support/20210921-032602
        git checkout 71b3775a5ce7b59e8c5292ae438284e8569c9e9f
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=x86_64 

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/amdgpu_vram_mgr.c:236:3: warning: variable 'usage' is uninitialized when used here [-Wuninitialized]
                   usage += amdgpu_vram_mgr_vis_size(adev, block);
                   ^~~~~
   drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c:227:11: note: initialize the variable 'usage' to silence this warning
           u64 usage;
                    ^
                     = 0
   1 warning generated.


vim +/usage +236 drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c

   212	
   213	/**
   214	 * amdgpu_vram_mgr_bo_visible_size - CPU visible BO size
   215	 *
   216	 * @bo: &amdgpu_bo buffer object (must be in VRAM)
   217	 *
   218	 * Returns:
   219	 * How much of the given &amdgpu_bo buffer object lies in CPU visible VRAM.
   220	 */
   221	u64 amdgpu_vram_mgr_bo_visible_size(struct amdgpu_bo *bo)
   222	{
   223		struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
   224		struct ttm_resource *res = bo->tbo.resource;
   225		struct amdgpu_vram_mgr_node *vnode = to_amdgpu_vram_mgr_node(res);
   226		struct drm_buddy_block *block;
   227		u64 usage;
   228	
   229		if (amdgpu_gmc_vram_full_visible(&adev->gmc))
   230			return amdgpu_bo_size(bo);
   231	
   232		if (res->start >= adev->gmc.visible_vram_size >> PAGE_SHIFT)
   233			return 0;
   234	
   235		list_for_each_entry(block, &vnode->blocks, link)
 > 236			usage += amdgpu_vram_mgr_vis_size(adev, block);
   237	
   238		return usage;
   239	}
   240	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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