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SubjectRe: [PATCH] riscv: Support non-coherency memory model
Hi,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.1-rc6 next-20190418]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/guoren-kernel-org/riscv-Support-non-coherency-memory-model/20190423-075013
config: riscv-tinyconfig (attached as .config)
compiler: riscv64-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
# save the attached .config to linux build tree
GCC_VERSION=8.1.0 make.cross ARCH=riscv

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>


All errors (new ones prefixed by >>):

arch/riscv/mm/dma-mapping.c: In function 'arch_dma_prep_coherent':
>> arch/riscv/mm/dma-mapping.c:15:2: error: implicit declaration of function 'sbi_fence_dma' [-Werror=implicit-function-declaration]
sbi_fence_dma(page_to_phys(page), size, DMA_BIDIRECTIONAL);
^~~~~~~~~~~~~
cc1: some warnings being treated as errors

vim +/sbi_fence_dma +15 arch/riscv/mm/dma-mapping.c

10
11 void arch_dma_prep_coherent(struct page *page, size_t size)
12 {
13 memset(page_address(page), 0, size);
14
> 15 sbi_fence_dma(page_to_phys(page), size, DMA_BIDIRECTIONAL);
16 }
17

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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