direct.c:undefined reference to `arch_dma_alloc'

[kbuild test robot]

Hi Christoph,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   645ff1e8e704c4f33ab1fcd3c87f95cb9b6d7144
commit: 68c608345cc569bcfa1c1b2add4c00c343ecf933 swiotlb: remove dma_mark_clean
date:   3 weeks ago
config: ia64-zx1_defconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 8.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 68c608345cc569bcfa1c1b2add4c00c343ecf933
        # save the attached .config to linux build tree
        GCC_VERSION=8.1.0 make.cross ARCH=ia64 

All errors (new ones prefixed by >>):

   kernel/dma/mapping.o: In function `dma_common_get_sgtable':
   mapping.c:(.text+0x10d2): undefined reference to `arch_dma_coherent_to_pfn'
   kernel/dma/mapping.o: In function `dma_common_mmap':
   mapping.c:(.text+0x1452): undefined reference to `arch_dma_coherent_to_pfn'
   kernel/dma/direct.o: In function `dma_direct_alloc':
>> direct.c:(.text+0x1162): undefined reference to `arch_dma_alloc'
   kernel/dma/direct.o: In function `dma_direct_free':
>> direct.c:(.text+0x1352): undefined reference to `arch_dma_free'

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