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Perhaps something to improve: [auto build test WARNING on linus/master] [also build test WARNING on next-20220527] [cannot apply to drm/drm-next media-tree/master drm-intel/for-linux-next v5.18] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/intel-lab-lkp/linux/commits/Dmitry-Osipenko/Add-generic-memory-shrinker-to-VirtIO-GPU-and-Panfrost-DRM-drivers/20220527-075717 base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git cdeffe87f790dfd1baa193020411ce9a538446d7 config: arm-randconfig-c002-20220524 (https://download.01.org/0day-ci/archive/20220528/202205280550.MWGs9cj4-lkp@intel.com/config) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 134d7f9a4b97e9035150d970bd9e376043c4577e) 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 arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://github.com/intel-lab-lkp/linux/commit/97f090c47ec995a8cf3bced98526ee3eaa25f10f git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Dmitry-Osipenko/Add-generic-memory-shrinker-to-VirtIO-GPU-and-Panfrost-DRM-drivers/20220527-075717 git checkout 97f090c47ec995a8cf3bced98526ee3eaa25f10f # save the config file COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm clang-analyzer If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot clang-analyzer warnings: (new ones prefixed by >>) >> drivers/dma-buf/dma-buf.c:1339:3: warning: Undefined or garbage value returned to caller [clang-analyzer-core.uninitialized.UndefReturn] return ret; ^ vim +1339 drivers/dma-buf/dma-buf.c 4c78513e457f72 drivers/base/dma-buf.c Daniel Vetter 2012-04-24 1327 97f090c47ec995 drivers/dma-buf/dma-buf.c Dmitry Osipenko 2022-05-27 1328 static int dma_buf_vmap_locked(struct dma_buf *dmabuf, struct iosys_map *map) 97f090c47ec995 drivers/dma-buf/dma-buf.c Dmitry Osipenko 2022-05-27 1329 { 97f090c47ec995 drivers/dma-buf/dma-buf.c Dmitry Osipenko 2022-05-27 1330 struct iosys_map ptr; 97f090c47ec995 drivers/dma-buf/dma-buf.c Dmitry Osipenko 2022-05-27 @1331 int ret; 4c78513e457f72 drivers/base/dma-buf.c Daniel Vetter 2012-04-24 1332 97f090c47ec995 drivers/dma-buf/dma-buf.c Dmitry Osipenko 2022-05-27 1333 dma_resv_assert_held(dmabuf->resv); 4c78513e457f72 drivers/base/dma-buf.c Daniel Vetter 2012-04-24 1334 97f090c47ec995 drivers/dma-buf/dma-buf.c Dmitry Osipenko 2022-05-27 1335 if (dmabuf->vmapping_counter) { 97f090c47ec995 drivers/dma-buf/dma-buf.c Dmitry Osipenko 2022-05-27 1336 dmabuf->vmapping_counter++; 97f090c47ec995 drivers/dma-buf/dma-buf.c Dmitry Osipenko 2022-05-27 1337 BUG_ON(iosys_map_is_null(&dmabuf->vmap_ptr)); 97f090c47ec995 drivers/dma-buf/dma-buf.c Dmitry Osipenko 2022-05-27 1338 *map = dmabuf->vmap_ptr; 97f090c47ec995 drivers/dma-buf/dma-buf.c Dmitry Osipenko 2022-05-27 @1339 return ret; 97f090c47ec995 drivers/dma-buf/dma-buf.c Dmitry Osipenko 2022-05-27 1340 } 97f090c47ec995 drivers/dma-buf/dma-buf.c Dmitry Osipenko 2022-05-27 1341 97f090c47ec995 drivers/dma-buf/dma-buf.c Dmitry Osipenko 2022-05-27 1342 BUG_ON(iosys_map_is_set(&dmabuf->vmap_ptr)); 97f090c47ec995 drivers/dma-buf/dma-buf.c Dmitry Osipenko 2022-05-27 1343 97f090c47ec995 drivers/dma-buf/dma-buf.c Dmitry Osipenko 2022-05-27 1344 ret = dmabuf->ops->vmap(dmabuf, &ptr); 97f090c47ec995 drivers/dma-buf/dma-buf.c Dmitry Osipenko 2022-05-27 1345 if (WARN_ON_ONCE(ret)) 97f090c47ec995 drivers/dma-buf/dma-buf.c Dmitry Osipenko 2022-05-27 1346 return ret; 97f090c47ec995 drivers/dma-buf/dma-buf.c Dmitry Osipenko 2022-05-27 1347 97f090c47ec995 drivers/dma-buf/dma-buf.c Dmitry Osipenko 2022-05-27 1348 dmabuf->vmap_ptr = ptr; 97f090c47ec995 drivers/dma-buf/dma-buf.c Dmitry Osipenko 2022-05-27 1349 dmabuf->vmapping_counter = 1; 97f090c47ec995 drivers/dma-buf/dma-buf.c Dmitry Osipenko 2022-05-27 1350 97f090c47ec995 drivers/dma-buf/dma-buf.c Dmitry Osipenko 2022-05-27 1351 *map = dmabuf->vmap_ptr; 97f090c47ec995 drivers/dma-buf/dma-buf.c Dmitry Osipenko 2022-05-27 1352 97f090c47ec995 drivers/dma-buf/dma-buf.c Dmitry Osipenko 2022-05-27 1353 return 0; 4c78513e457f72 drivers/base/dma-buf.c Daniel Vetter 2012-04-24 1354 } 98f86c9e4ae320 drivers/base/dma-buf.c Dave Airlie 2012-05-20 1355 -- 0-DAY CI Kernel Test Service https://01.org/lkp