arch/mips/bmips/dma.c:7:6: warning: no previous prototype for 'arch_sync_dma_for_cpu_all'

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

Hi Jim,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   13bc32bad7059d6c5671e9d037e6e3ed001cc0f4
commit: d552ddeaab4a15a8dc157ac007833aa0b3706862 MIPS: bmips: Remove obsolete DMA mapping support
date:   3 months ago
config: mips-bmips_be_defconfig (https://download.01.org/0day-ci/archive/20220424/202204240410.f0TrdLMQ-lkp@intel.com/config)
compiler: mips-linux-gcc (GCC) 11.2.0
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=d552ddeaab4a15a8dc157ac007833aa0b3706862
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout d552ddeaab4a15a8dc157ac007833aa0b3706862
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash arch/mips/bmips/

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:7:6: warning: no previous prototype for 'arch_sync_dma_for_cpu_all' [-Wmissing-prototypes]
       7 | void arch_sync_dma_for_cpu_all(void)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~


vim +/arch_sync_dma_for_cpu_all +7 arch/mips/bmips/dma.c

d666cd0246f78bd arch/mips/bcm3384/dma.c Kevin Cernekee    2014-10-20  6  
56e35f9c5b87ec1 arch/mips/bmips/dma.c   Christoph Hellwig 2019-11-07 @7  void arch_sync_dma_for_cpu_all(void)

:::::: The code at line 7 was first introduced by commit
:::::: 56e35f9c5b87ec1ae93e483284e189c84388de16 dma-mapping: drop the dev argument to arch_sync_dma_for_*

:::::: TO: Christoph Hellwig <hch@lst.de>
:::::: CC: Christoph Hellwig <hch@lst.de>

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp