arch/mips/bmips/dma.c:55:13: warning: no previous prototype for 'dma_to_phys'

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

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   c4d6fe7311762f2e03b3c27ad38df7c40c80cc93
commit: 7bc5c428a660d4d1bc95ba54bf4cb6bccf8c3029 dma-direct: remove __dma_to_phys
date:   6 weeks ago
config: mips-randconfig-r022-20201021 (attached as .config)
compiler: mips-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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7bc5c428a660d4d1bc95ba54bf4cb6bccf8c3029
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 7bc5c428a660d4d1bc95ba54bf4cb6bccf8c3029
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips 

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

All warnings (new ones prefixed by >>):

   arch/mips/bmips/dma.c:43:12: warning: no previous prototype for '__phys_to_dma' [-Wmissing-prototypes]
      43 | dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t pa)
         |            ^~~~~~~~~~~~~
>> arch/mips/bmips/dma.c:55:13: warning: no previous prototype for 'dma_to_phys' [-Wmissing-prototypes]
      55 | phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dma_addr)
         |             ^~~~~~~~~~~
   arch/mips/bmips/dma.c:67:6: warning: no previous prototype for 'arch_sync_dma_for_cpu_all' [-Wmissing-prototypes]
      67 | void arch_sync_dma_for_cpu_all(void)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~

vim +/dma_to_phys +55 arch/mips/bmips/dma.c

    54	
  > 55	phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dma_addr)
    56	{
    57		struct bmips_dma_range *r;
    58	
    59		for (r = bmips_dma_ranges; r && r->size; r++) {
    60			if (dma_addr >= r->parent_addr &&
    61			    dma_addr < (r->parent_addr + r->size))
    62				return dma_addr - r->parent_addr + r->child_addr;
    63		}
    64		return dma_addr;
    65	}
    66	

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

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