Hi Marek,

[FYI, it's a private test report for your RFC patch.]
[auto build test ERROR on drm-exynos/exynos-drm-next]
[also build test ERROR on next-20200428]
[cannot apply to drm-intel/for-linux-next tegra-drm/drm/tegra/for-next linus/master v5.7-rc3]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Marek-Szyprowski/DRM-fix-struct-sg_table-nents-vs-orig_nents-misuse/20200429-040352
base:   https://git.kernel.org/pub/scm/linux/kernel/git/daeinki/drm-exynos.git exynos-drm-next
config: x86_64-defconfig (attached as .config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   drivers/gpu/drm/i915/i915_gem_gtt.c: In function 'i915_gem_gtt_prepare_pages':
>> drivers/gpu/drm/i915/i915_gem_gtt.c:35:7: error: 'page' undeclared (first use in this function)
      if (page->nents)
          ^~~~
   drivers/gpu/drm/i915/i915_gem_gtt.c:35:7: note: each undeclared identifier is reported only once for each function it appears in

vim +/page +35 drivers/gpu/drm/i915/i915_gem_gtt.c

    26	
    27	int i915_gem_gtt_prepare_pages(struct drm_i915_gem_object *obj,
    28				       struct sg_table *pages)
    29	{
    30		do {
    31			pages->nents = dma_map_sg_attrs(&obj->base.dev->pdev->dev,
    32							pages->sgl, pages->orig_nents,
    33							PCI_DMA_BIDIRECTIONAL,
    34							DMA_ATTR_NO_WARN);
  > 35			if (page->nents)
    36				return 0;
    37	
    38			/*
    39			 * If the DMA remap fails, one cause can be that we have
    40			 * too many objects pinned in a small remapping table,
    41			 * such as swiotlb. Incrementally purge all other objects and
    42			 * try again - if there are no more pages to remove from
    43			 * the DMA remapper, i915_gem_shrink will return 0.
    44			 */
    45			GEM_BUG_ON(obj->mm.pages == pages);
    46		} while (i915_gem_shrink(to_i915(obj->base.dev),
    47					 obj->base.size >> PAGE_SHIFT, NULL,
    48					 I915_SHRINK_BOUND |
    49					 I915_SHRINK_UNBOUND));
    50	
    51		return -ENOSPC;
    52	}
    53	

---
0-DAY CI Kernel Test Service, Intel Corporation
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