drivers/gpu/drm/exynos/exynos_drm_gem.c:62:36: sparse: sparse: incorrect type in assignment (different address spaces)

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 
master
head:   dcb7fd82c75ee2d6e6f9d8cc71c52519ed52e258
commit: 9940d9d93406f41ad4dc69fa2cda1e059a7ca108 drm/exynos: gem: Get rid of 
the internal 'pages' array
date:   7 weeks ago
config: arm64-randconfig-s032-20200706 (attached as .config)
compiler: aarch64-linux-gcc (GCC) 9.3.0
reproduce:
        wget 
https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O 
~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.2-14-g8fce3d7a-dirty
        git checkout 9940d9d93406f41ad4dc69fa2cda1e059a7ca108
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 
CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=arm64 

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


sparse warnings: (new ones prefixed by >>)

>> drivers/gpu/drm/exynos/exynos_drm_gem.c:62:36: sparse: sparse: incorrect 
>> type in assignment (different address spaces) @@     expected void [noderef] 
>> <asn:2> *kvaddr @@     got void *cookie @@
>> drivers/gpu/drm/exynos/exynos_drm_gem.c:62:36: sparse:     expected void 
>> [noderef] <asn:2> *kvaddr
>> drivers/gpu/drm/exynos/exynos_drm_gem.c:62:36: sparse:     got void *cookie

vim +62 drivers/gpu/drm/exynos/exynos_drm_gem.c

    19  
    20  static int exynos_drm_alloc_buf(struct exynos_drm_gem *exynos_gem, bool 
kvmap)
    21  {
    22          struct drm_device *dev = exynos_gem->base.dev;
    23          unsigned long attr = 0;
    24  
    25          if (exynos_gem->dma_addr) {
    26                  DRM_DEV_DEBUG_KMS(to_dma_dev(dev), "already 
allocated.\n");
    27                  return 0;
    28          }
    29  
    30          /*
    31           * if EXYNOS_BO_CONTIG, fully physically contiguous memory
    32           * region will be allocated else physically contiguous
    33           * as possible.
    34           */
    35          if (!(exynos_gem->flags & EXYNOS_BO_NONCONTIG))
    36                  attr |= DMA_ATTR_FORCE_CONTIGUOUS;
    37  
    38          /*
    39           * if EXYNOS_BO_WC or EXYNOS_BO_NONCACHABLE, writecombine 
mapping
    40           * else cachable mapping.
    41           */
    42          if (exynos_gem->flags & EXYNOS_BO_WC ||
    43                          !(exynos_gem->flags & EXYNOS_BO_CACHABLE))
    44                  attr |= DMA_ATTR_WRITE_COMBINE;
    45          else
    46                  attr |= DMA_ATTR_NON_CONSISTENT;
    47  
    48          /* FBDev emulation requires kernel mapping */
    49          if (!kvmap)
    50                  attr |= DMA_ATTR_NO_KERNEL_MAPPING;
    51  
    52          exynos_gem->dma_attrs = attr;
    53          exynos_gem->cookie = dma_alloc_attrs(to_dma_dev(dev), 
exynos_gem->size,
    54                                               &exynos_gem->dma_addr, 
GFP_KERNEL,
    55                                               exynos_gem->dma_attrs);
    56          if (!exynos_gem->cookie) {
    57                  DRM_DEV_ERROR(to_dma_dev(dev), "failed to allocate 
buffer.\n");
    58                  return -ENOMEM;
    59          }
    60  
    61          if (kvmap)
  > 62                  exynos_gem->kvaddr = exynos_gem->cookie;
    63  
    64          DRM_DEV_DEBUG_KMS(to_dma_dev(dev), "dma_addr(0x%lx), 
size(0x%lx)\n",
    65                          (unsigned long)exynos_gem->dma_addr, 
exynos_gem->size);
    66          return 0;
    67  }
    68  

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-...@lists.01.org

.config.gz
Description: application/gzip