Hi Marek,

I love your patch! Yet something to improve:

[auto build test ERROR on next-20200618]
[also build test ERROR on v5.8-rc1]
[cannot apply to linuxtv-media/master staging/staging-testing drm-exynos/exynos-drm-next drm-intel/for-linux-next linus/master v5.8-rc1 v5.7 v5.7-rc7]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use  as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Marek-Szyprowski/DRM-fix-struct-sg_table-nents-vs-orig_nents-misuse/20200619-184302
base:    ce2cc8efd7a40cbd17841add878cb691d0ce0bba
config: c6x-allyesconfig (attached as .config)
compiler: c6x-elf-gcc (GCC) 9.3.0
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
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=c6x 

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

All errors (new ones prefixed by >>):

   drivers/staging/media/tegra-vde/iommu.c: In function 'tegra_vde_iommu_map':
>> drivers/staging/media/tegra-vde/iommu.c:39:9: error: implicit declaration of function 'iommu_map_sgtable'; did you mean 'dma_map_sgtable'? [-Werror=implicit-function-declaration]
      39 |  size = iommu_map_sgtable(vde->domain, addr, sgt,
         |         ^~~~~~~~~~~~~~~~~
         |         dma_map_sgtable
   cc1: some warnings being treated as errors

vim +39 drivers/staging/media/tegra-vde/iommu.c

    18	
    19	int tegra_vde_iommu_map(struct tegra_vde *vde,
    20				struct sg_table *sgt,
    21				struct iova **iovap,
    22				size_t size)
    23	{
    24		struct iova *iova;
    25		unsigned long shift;
    26		unsigned long end;
    27		dma_addr_t addr;
    28	
    29		end = vde->domain->geometry.aperture_end;
    30		size = iova_align(&vde->iova, size);
    31		shift = iova_shift(&vde->iova);
    32	
    33		iova = alloc_iova(&vde->iova, size >> shift, end >> shift, true);
    34		if (!iova)
    35			return -ENOMEM;
    36	
    37		addr = iova_dma_addr(&vde->iova, iova);
    38	
  > 39		size = iommu_map_sgtable(vde->domain, addr, sgt,
    40					 IOMMU_READ | IOMMU_WRITE);
    41		if (!size) {
    42			__free_iova(&vde->iova, iova);
    43			return -ENXIO;
    44		}
    45	
    46		*iovap = iova;
    47	
    48		return 0;
    49	}
    50	

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