Hi Oak,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on drm-intel/for-linux-next]
[also build test ERROR on drm-tip/drm-tip linus/master v5.12-rc1 next-20210302]
[cannot apply to tegra-drm/drm/tegra/for-next drm-exynos/exynos-drm-next drm/drm-next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Oak-Zeng/drm-ttm-ioremap-buffer-according-to-TTM-mem-caching-setting/20210302-064500
base:   git://anongit.freedesktop.org/drm-intel for-linux-next
config: parisc-randconfig-r012-20210302 (attached as .config)
compiler: hppa-linux-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
        # https://github.com/0day-ci/linux/commit/225bb3711439ec559dd72ae5af8e62d34ea60a64
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Oak-Zeng/drm-ttm-ioremap-buffer-according-to-TTM-mem-caching-setting/20210302-064500
        git checkout 225bb3711439ec559dd72ae5af8e62d34ea60a64
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=parisc 

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/gpu/drm/ttm/ttm_bo_util.c: In function 'ttm_resource_ioremap':
>> drivers/gpu/drm/ttm/ttm_bo_util.c:95:11: error: implicit declaration of function 'ioremap_cache'; did you mean 'ioremap_uc'? [-Werror=implicit-function-declaration]
      95 |    addr = ioremap_cache(mem->bus.offset, bus_size);
         |           ^~~~~~~~~~~~~
         |           ioremap_uc
   drivers/gpu/drm/ttm/ttm_bo_util.c:95:9: warning: assignment to 'void *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
      95 |    addr = ioremap_cache(mem->bus.offset, bus_size);
         |         ^
   drivers/gpu/drm/ttm/ttm_bo_util.c: In function 'ttm_bo_ioremap':
   drivers/gpu/drm/ttm/ttm_bo_util.c:379:17: warning: assignment to 'void *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
     379 |    map->virtual = ioremap_cache(bo->mem.bus.offset + offset,
         |                 ^
   drivers/gpu/drm/ttm/ttm_bo_util.c: In function 'ttm_bo_vmap':
   drivers/gpu/drm/ttm/ttm_bo_util.c:500:16: warning: assignment to 'void *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
     500 |    vaddr_iomem = ioremap_cache(mem->bus.offset,
         |                ^
   cc1: some warnings being treated as errors


vim +95 drivers/gpu/drm/ttm/ttm_bo_util.c

    74	
    75	static int ttm_resource_ioremap(struct ttm_bo_device *bdev,
    76				       struct ttm_resource *mem,
    77				       void **virtual)
    78	{
    79		int ret;
    80		void *addr;
    81	
    82		*virtual = NULL;
    83		ret = ttm_mem_io_reserve(bdev, mem);
    84		if (ret || !mem->bus.is_iomem)
    85			return ret;
    86	
    87		if (mem->bus.addr) {
    88			addr = mem->bus.addr;
    89		} else {
    90			size_t bus_size = (size_t)mem->num_pages << PAGE_SHIFT;
    91	
    92			if (mem->bus.caching == ttm_write_combined)
    93				addr = ioremap_wc(mem->bus.offset, bus_size);
    94			else if (mem->bus.caching == ttm_cached)
  > 95				addr = ioremap_cache(mem->bus.offset, bus_size);
    96			else
    97				addr = ioremap(mem->bus.offset, bus_size);
    98			if (!addr) {
    99				ttm_mem_io_free(bdev, mem);
   100				return -ENOMEM;
   101			}
   102		}
   103		*virtual = addr;
   104		return 0;
   105	}
   106	

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