[intel-tdx:guest 36/144] arch/x86/mm/mem_encrypt_common.c:14:6: warning: no previous prototype for 'force_dma_unencrypted'

[kernel test robot]

tree:   https://github.com/intel/tdx.git guest
head:   41fe88a1b3c28543f49fa6ed9e0e9b6650ed7614
commit: e6712c98ae60430d8f0d207fa3352e408a56c69f [36/144] x86/mm: Move force_dma_unencrypted() to common code
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20211210/202112100722.xdCK1rLH-lkp@xxxxxxxxx/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel/tdx/commit/e6712c98ae60430d8f0d207fa3352e408a56c69f
        git remote add intel-tdx https://github.com/intel/tdx.git
        git fetch --no-tags intel-tdx guest
        git checkout e6712c98ae60430d8f0d207fa3352e408a56c69f
        # save the config file to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/mm/

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

All warnings (new ones prefixed by >>):

>> arch/x86/mm/mem_encrypt_common.c:14:6: warning: no previous prototype for 'force_dma_unencrypted' [-Wmissing-prototypes]
      14 | bool force_dma_unencrypted(struct device *dev)
         |      ^~~~~~~~~~~~~~~~~~~~~


vim +/force_dma_unencrypted +14 arch/x86/mm/mem_encrypt_common.c

    12	
    13	/* Override for DMA direct allocation check - ARCH_HAS_FORCE_DMA_UNENCRYPTED */
  > 14	bool force_dma_unencrypted(struct device *dev)

---
0-DAY CI Kernel Test Service, Intel Corporation
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