Hi Barry, url: https://github.com/0day-ci/linux/commits/Barry-Song/support-per-numa-CMA-for-ARM-server/20200603-104821 base: https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core config: x86_64-randconfig-m001-20200603 (attached as .config) compiler: gcc-9 (Debian 9.3.0-13) 9.3.0
If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <l...@intel.com> Reported-by: Dan Carpenter <dan.carpen...@oracle.com> smatch warnings: kernel/dma/contiguous.c:274 dma_alloc_contiguous() warn: variable dereferenced before check 'dev' (see line 272) # https://github.com/0day-ci/linux/commit/adb919e972c1cac3d8b11905d5258d23d3aac6a4 git remote add linux-review https://github.com/0day-ci/linux git remote update linux-review git checkout adb919e972c1cac3d8b11905d5258d23d3aac6a4 vim +/dev +274 kernel/dma/contiguous.c b1d2dc009dece4 kernel/dma/contiguous.c Nicolin Chen 2019-05-23 267 struct page *dma_alloc_contiguous(struct device *dev, size_t size, gfp_t gfp) b1d2dc009dece4 kernel/dma/contiguous.c Nicolin Chen 2019-05-23 268 { 90ae409f9eb3bc kernel/dma/contiguous.c Christoph Hellwig 2019-08-20 269 size_t count = size >> PAGE_SHIFT; b1d2dc009dece4 kernel/dma/contiguous.c Nicolin Chen 2019-05-23 270 struct page *page = NULL; bd2e75633c8012 kernel/dma/contiguous.c Nicolin Chen 2019-05-23 271 struct cma *cma = NULL; adb919e972c1ca kernel/dma/contiguous.c Barry Song 2020-06-03 @272 int nid = dev_to_node(dev); ^^^ Dereferenced inside function. bd2e75633c8012 kernel/dma/contiguous.c Nicolin Chen 2019-05-23 273 bd2e75633c8012 kernel/dma/contiguous.c Nicolin Chen 2019-05-23 @274 if (dev && dev->cma_area) ^^^ Too late. bd2e75633c8012 kernel/dma/contiguous.c Nicolin Chen 2019-05-23 275 cma = dev->cma_area; adb919e972c1ca kernel/dma/contiguous.c Barry Song 2020-06-03 276 else if ((nid != NUMA_NO_NODE) && dma_contiguous_pernuma_area[nid] adb919e972c1ca kernel/dma/contiguous.c Barry Song 2020-06-03 277 && !(gfp & (GFP_DMA | GFP_DMA32))) adb919e972c1ca kernel/dma/contiguous.c Barry Song 2020-06-03 278 cma = dma_contiguous_pernuma_area[nid]; bd2e75633c8012 kernel/dma/contiguous.c Nicolin Chen 2019-05-23 279 else if (count > 1) bd2e75633c8012 kernel/dma/contiguous.c Nicolin Chen 2019-05-23 280 cma = dma_contiguous_default_area; b1d2dc009dece4 kernel/dma/contiguous.c Nicolin Chen 2019-05-23 281 b1d2dc009dece4 kernel/dma/contiguous.c Nicolin Chen 2019-05-23 282 /* CMA can be used only in the context which permits sleeping */ b1d2dc009dece4 kernel/dma/contiguous.c Nicolin Chen 2019-05-23 283 if (cma && gfpflags_allow_blocking(gfp)) { --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-...@lists.01.org
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