[arm-platforms:kvm/protected-memory 3/16] arch/x86/mm/mem_encrypt_common.c:16:6: warning: no previous prototype for 'force_dma_unencrypted'

Hi Kirill,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git kvm/protected-memory
head:   d9455e6eabef4b9be5f33c418a8046e0389edade
commit: dbd4c551b3d34cb3e06e575eb205e2056f4a6e76 [3/16] x86/kvm: Make DMA pages shared
config: x86_64-randconfig-s021-20200916 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.2-201-g24bdaac6-dirty
        git checkout dbd4c551b3d34cb3e06e575eb205e2056f4a6e76
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 

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

All warnings (new ones prefixed by >>):

quoted

arch/x86/mm/mem_encrypt_common.c:16:6: warning: no previous prototype for 'force_dma_unencrypted' [-Wmissing-prototypes]

      16 | bool force_dma_unencrypted(struct device *dev)
         |      ^~~~~~~~~~~~~~~~~~~~~

# https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git/commit/?id=dbd4c551b3d34cb3e06e575eb205e2056f4a6e76
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 dbd4c551b3d34cb3e06e575eb205e2056f4a6e76
vim +/force_dma_unencrypted +16 arch/x86/mm/mem_encrypt_common.c

0fdb85af352f8f Kirill A. Shutemov 2020-05-22  14  
0fdb85af352f8f Kirill A. Shutemov 2020-05-22  15  /* Override for DMA direct allocation check - ARCH_HAS_FORCE_DMA_UNENCRYPTED */
0fdb85af352f8f Kirill A. Shutemov 2020-05-22 @16  bool force_dma_unencrypted(struct device *dev)

:::::: The code at line 16 was first introduced by commit
:::::: 0fdb85af352f8f003ce368eaeee57406f748801e x86/mm: Move force_dma_unencrypted() to common code

:::::: TO: Kirill A. Shutemov [off-list ref]
:::::: CC: Marc Zyngier [off-list ref]

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