tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 9d49ed9ca93b8c564033c1d6808017bc9052b5db commit: 204302d90503407d2af233c1222b2e79f35580f3 [8015/8469] i915: fix remap_io_sg to verify the pgprot config: i386-randconfig-m021-20210329 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> smatch warnings: drivers/gpu/drm/i915/i915_mm.c:76 remap_io_sg() error: uninitialized symbol 'err'. vim +/err +76 drivers/gpu/drm/i915/i915_mm.c 4e598fad226be0 Abdiel Janulgue 2020-01-03 45 int remap_io_sg(struct vm_area_struct *vma, 1764b992be0f1c Abdiel Janulgue 2019-12-31 46 unsigned long addr, unsigned long size, 4e598fad226be0 Abdiel Janulgue 2020-01-03 47 struct scatterlist *sgl, resource_size_t iobase) 1764b992be0f1c Abdiel Janulgue 2019-12-31 48 { 204302d9050340 Christoph Hellwig 2021-03-29 49 unsigned long pfn, len, remapped = 0; 1764b992be0f1c Abdiel Janulgue 2019-12-31 50 int err; 1764b992be0f1c Abdiel Janulgue 2019-12-31 51 1764b992be0f1c Abdiel Janulgue 2019-12-31 52 /* We rely on prevalidation of the io-mapping to skip track_pfn(). */ 1764b992be0f1c Abdiel Janulgue 2019-12-31 53 GEM_BUG_ON((vma->vm_flags & EXPECTED_FLAGS) != EXPECTED_FLAGS); 1764b992be0f1c Abdiel Janulgue 2019-12-31 54 4e598fad226be0 Abdiel Janulgue 2020-01-03 55 if (!use_dma(iobase)) 1764b992be0f1c Abdiel Janulgue 2019-12-31 56 flush_cache_range(vma, addr, size); 4e598fad226be0 Abdiel Janulgue 2020-01-03 57 204302d9050340 Christoph Hellwig 2021-03-29 58 do { 204302d9050340 Christoph Hellwig 2021-03-29 59 if (use_dma(iobase)) { 204302d9050340 Christoph Hellwig 2021-03-29 60 if (!sg_dma_len(sgl)) 204302d9050340 Christoph Hellwig 2021-03-29 61 break; ^^^^^ Can this break on the first iteration through the loop? 204302d9050340 Christoph Hellwig 2021-03-29 62 pfn = (sg_dma_address(sgl) + iobase) >> PAGE_SHIFT; 204302d9050340 Christoph Hellwig 2021-03-29 63 len = sg_dma_len(sgl); 204302d9050340 Christoph Hellwig 2021-03-29 64 } else { 204302d9050340 Christoph Hellwig 2021-03-29 65 pfn = page_to_pfn(sg_page(sgl)); 204302d9050340 Christoph Hellwig 2021-03-29 66 len = sgl->length; 1764b992be0f1c Abdiel Janulgue 2019-12-31 67 } 1764b992be0f1c Abdiel Janulgue 2019-12-31 68 204302d9050340 Christoph Hellwig 2021-03-29 69 err = remap_pfn_range(vma, addr + remapped, pfn, len, 204302d9050340 Christoph Hellwig 2021-03-29 70 vma->vm_page_prot); 204302d9050340 Christoph Hellwig 2021-03-29 71 if (err) 204302d9050340 Christoph Hellwig 2021-03-29 72 break; 204302d9050340 Christoph Hellwig 2021-03-29 73 remapped += len; 204302d9050340 Christoph Hellwig 2021-03-29 74 } while ((sgl = __sg_next(sgl))); 204302d9050340 Christoph Hellwig 2021-03-29 75 204302d9050340 Christoph Hellwig 2021-03-29 @76 if (err) --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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