Hi Jordan, kernel test robot noticed the following build warnings:
[auto build test WARNING on 344db0fba38920be64a429c64a8ca0531572896c] url: https://github.com/intel-lab-lkp/linux/commits/Jordan-Niethe/mm-migrate_device-Introduce-migrate_pfn_from_page-helper/20260130-191416 base: 344db0fba38920be64a429c64a8ca0531572896c patch link: https://lore.kernel.org/r/20260130111050.53670-14-jniethe%40nvidia.com patch subject: [PATCH v5 13/13] mm: Remove device private pages from the physical address space config: loongarch-allmodconfig (https://download.01.org/0day-ci/archive/20260201/[email protected]/config) compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260201/[email protected]/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <[email protected]> | Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/ All warnings (new ones prefixed by >>): >> drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_migrate.c:1071:7: warning: variable >> 'ret' is used uninitialized whenever 'if' condition is false >> [-Wsometimes-uninitialized] 1071 | if (IS_ERR(r)) | ^~~~~~~~~ drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_migrate.c:1075:6: note: uninitialized use occurs here 1075 | if (ret) { | ^~~ drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_migrate.c:1071:3: note: remove the 'if' if its condition is always true 1071 | if (IS_ERR(r)) | ^~~~~~~~~~~~~~ 1072 | ret = PTR_ERR(r); drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_migrate.c:1035:9: note: initialize the variable 'ret' to silence this warning 1035 | int ret; | ^ | = 0 1 warning generated. vim +1071 drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_migrate.c 1028 1029 int kgd2kfd_init_zone_device(struct amdgpu_device *adev) 1030 { 1031 struct amdgpu_kfd_dev *kfddev = &adev->kfd; 1032 struct dev_pagemap *pgmap; 1033 unsigned long size; 1034 void *r; 1035 int ret; 1036 1037 /* Page migration works on gfx9 or newer */ 1038 if (amdgpu_ip_version(adev, GC_HWIP, 0) < IP_VERSION(9, 0, 1)) 1039 return -EINVAL; 1040 1041 if (adev->apu_prefer_gtt) 1042 return 0; 1043 1044 pgmap = &kfddev->pgmap; 1045 memset(pgmap, 0, sizeof(*pgmap)); 1046 1047 /* TODO: register all vram to HMM for now. 1048 * should remove reserved size 1049 */ 1050 size = ALIGN(adev->gmc.real_vram_size, 2ULL << 20); 1051 if (adev->gmc.xgmi.connected_to_cpu) { 1052 pgmap->range.start = adev->gmc.aper_base; 1053 pgmap->range.end = adev->gmc.aper_base + adev->gmc.aper_size - 1; 1054 pgmap->type = MEMORY_DEVICE_COHERENT; 1055 } else { 1056 pgmap->nr_pages = size / PAGE_SIZE; 1057 pgmap->type = MEMORY_DEVICE_PRIVATE; 1058 } 1059 1060 pgmap->nr_range = 1; 1061 pgmap->ops = &svm_migrate_pgmap_ops; 1062 pgmap->owner = SVM_ADEV_PGMAP_OWNER(adev); 1063 pgmap->flags = 0; 1064 /* Device manager releases device-specific resources, memory region and 1065 * pgmap when driver disconnects from device. 1066 */ 1067 if (pgmap->type == MEMORY_DEVICE_PRIVATE) { 1068 ret = devm_memremap_device_private_pagemap(adev->dev, pgmap); 1069 } else { 1070 r = devm_memremap_pages(adev->dev, pgmap); > 1071 if (IS_ERR(r)) -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
