tree: git://git.infradead.org/users/hch/misc.git dma_alloc_pages head: ebfa77e612f8650cb120011030b7a9e951ebee56 commit: ebfa77e612f8650cb120011030b7a9e951ebee56 [17/17] dma-mapping: replace DMA_ATTR_NON_CONSISTENT with dma_{alloc,free}_pages config: i386-randconfig-m021-20200818 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; smatch warnings: kernel/dma/mapping.c:545 dma_alloc_pages() error: uninitialized symbol 'vaddr'. git remote add hch-misc git://git.infradead.org/users/hch/misc.git git fetch --no-tags hch-misc dma_alloc_pages git checkout ebfa77e612f8650cb120011030b7a9e951ebee56 vim +/vaddr +545 kernel/dma/mapping.c 524 525 void *dma_alloc_pages(struct device *dev, size_t size, dma_addr_t *dma_handle, 526 gfp_t gfp) 527 { 528 const struct dma_map_ops *ops = get_dma_ops(dev); 529 void *vaddr; 530 531 if (WARN_ON_ONCE(!dev->coherent_dma_mask)) 532 return NULL; 533 if (WARN_ON_ONCE(gfp & (__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM | 534 __GFP_COMP))) 535 return NULL; 536 537 size = PAGE_ALIGN(size); 538 if (dma_alloc_direct(dev, ops)) 539 vaddr = dma_direct_alloc_pages(dev, size, dma_handle, gfp); 540 else if (ops->alloc_pages) 541 vaddr = ops->alloc_pages(dev, size, dma_handle, gfp); 542 else 543 dma_simple_alloc_pages(dev, size, dma_handle, gfp); 544 546 } 547 EXPORT_SYMBOL_GPL(dma_alloc_pages); 548 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org