[arm-platforms:kvm/protected-memory 1/16] arch/x86/mm/mem_encrypt_common.c:15:6: warning: no previous prototype for function 'force_dma_unencrypted'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git kvm/protected-memory
head:   d9455e6eabef4b9be5f33c418a8046e0389edade
commit: 0fdb85af352f8f003ce368eaeee57406f748801e [1/16] x86/mm: Move force_dma_unencrypted() to common code
config: x86_64-randconfig-r014-20200916 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 9e3842d60351f986d77dfe0a94f76e4fd895f188)
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
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        git checkout 0fdb85af352f8f003ce368eaeee57406f748801e
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

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

All warnings (new ones prefixed by >>):

>> arch/x86/mm/mem_encrypt_common.c:15:6: warning: no previous prototype for function 'force_dma_unencrypted' [-Wmissing-prototypes]
   bool force_dma_unencrypted(struct device *dev)
        ^
   arch/x86/mm/mem_encrypt_common.c:15:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   bool force_dma_unencrypted(struct device *dev)
   ^
   static 
   1 warning generated.

# https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git/commit/?id=0fdb85af352f8f003ce368eaeee57406f748801e
git remote add arm-platforms https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git
git fetch --no-tags arm-platforms kvm/protected-memory
git checkout 0fdb85af352f8f003ce368eaeee57406f748801e
vim +/force_dma_unencrypted +15 arch/x86/mm/mem_encrypt_common.c

    13	
    14	/* Override for DMA direct allocation check - ARCH_HAS_FORCE_DMA_UNENCRYPTED */
  > 15	bool force_dma_unencrypted(struct device *dev)

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