Hi Yong,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on iommu/next]
[also build test ERROR on tegra/for-next arm-perf/for-next/perf v5.10-rc4 next-20201119]
[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/Yong-Wu/MediaTek-IOMMU-improve-tlb-flush-performance-in-map-unmap/20201119-142620
base:   https://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu.git next
config: m68k-randconfig-r001-20201119 (attached as .config)
compiler: m68k-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/7b8f6281690f7b2c2dbdfdabb6196bc29690c9ed
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Yong-Wu/MediaTek-IOMMU-improve-tlb-flush-performance-in-map-unmap/20201119-142620
        git checkout 7b8f6281690f7b2c2dbdfdabb6196bc29690c9ed
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=m68k 

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 >>):

   In file included from include/asm-generic/bug.h:5,
                    from arch/m68k/include/asm/bug.h:32,
                    from include/linux/bug.h:5,
                    from drivers/iommu/mtk_iommu.c:6:
   include/linux/scatterlist.h: In function 'sg_set_buf':
   arch/m68k/include/asm/page_mm.h:169:49: warning: ordered comparison of pointer with null pointer [-Wextra]
     169 | #define virt_addr_valid(kaddr) ((void *)(kaddr) >= (void *)PAGE_OFFSET && (void *)(kaddr) < high_memory)
         |                                                 ^~
   include/linux/compiler.h:78:42: note: in definition of macro 'unlikely'
      78 | # define unlikely(x) __builtin_expect(!!(x), 0)
         |                                          ^
   include/linux/scatterlist.h:143:2: note: in expansion of macro 'BUG_ON'
     143 |  BUG_ON(!virt_addr_valid(buf));
         |  ^~~~~~
   include/linux/scatterlist.h:143:10: note: in expansion of macro 'virt_addr_valid'
     143 |  BUG_ON(!virt_addr_valid(buf));
         |          ^~~~~~~~~~~~~~~
   drivers/iommu/mtk_iommu.c: In function 'mtk_iommu_sync_map':
>> drivers/iommu/mtk_iommu.c:461:54: error: 'struct mtk_iommu_domain' has no member named 'data'
     461 |  mtk_iommu_tlb_flush_range_sync(iova, size, size, dom->data);
         |                                                      ^~

vim +461 drivers/iommu/mtk_iommu.c

   455	
   456	static void mtk_iommu_sync_map(struct iommu_domain *domain, unsigned long iova,
   457				       size_t size)
   458	{
   459		struct mtk_iommu_domain *dom = to_mtk_domain(domain);
   460	
 > 461		mtk_iommu_tlb_flush_range_sync(iova, size, size, dom->data);
   462	}
   463	

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