[openeuler:OLK-5.10 2516/2516] drivers/gpu/drm/ast/ast_mm.c:91:39: sparse: sparse: incorrect type in assignment (different address spaces)

[kernel test robot <lkp@intel.com>]

tree:   https://gitee.com/openeuler/kernel.git OLK-5.10
head:   f030ffc8e0c6dac3503bebddbf49cc339003fcdb
commit: 968ee436e4d0ce09994f74015dc163ef280ccc1e [2516/2516] drm/ast: Fixed display error for ps23xx when using ast bmc card
config: x86_64-randconfig-121-20241203 (https://download.01.org/0day-ci/archive/20241203/202412032029.eVzOP3UR-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241203/202412032029.eVzOP3UR-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202412032029.eVzOP3UR-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/gpu/drm/ast/ast_mm.c:91:39: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected void *addr @@     got void [noderef] __iomem * @@
   drivers/gpu/drm/ast/ast_mm.c:91:39: sparse:     expected void *addr
   drivers/gpu/drm/ast/ast_mm.c:91:39: sparse:     got void [noderef] __iomem *

vim +91 drivers/gpu/drm/ast/ast_mm.c

    76	
    77	static int ast_driver_io_mem_reserve(struct ttm_bo_device *bdev,
    78										struct ttm_resource *mem)
    79	{
    80		struct drm_vram_mm *vmm = drm_vram_mm_of_bdev(bdev);
    81		size_t bus_size = (size_t)mem->num_pages << PAGE_SHIFT;
    82	
    83		switch (mem->mem_type) {
    84		case TTM_PL_SYSTEM:     /* nothing to do */
    85				break;
    86		case TTM_PL_VRAM:
    87				mem->bus.offset = (mem->start << PAGE_SHIFT) + vmm->vram_base;
    88				mem->bus.is_iomem = true;
    89	
    90				mem->placement = TTM_PL_FLAG_UNCACHED;
  > 91				mem->bus.addr = ioremap(mem->bus.offset, bus_size);
    92	
    93				if (!mem->bus.addr)
    94					return -ENOMEM;
    95	
    96				break;
    97		default:
    98				return -EINVAL;
    99		}
   100	
   101		return 0;
   102	}
   103	

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