[joro:sev-es-client-tip-5.9 49/76] arch/x86/kernel/sev-es.c:594:1: warning: no previous prototype for function 'ist_exc_vmm_communication'

[joro:sev-es-client-tip-5.9 49/76] arch/x86/kernel/sev-es.c:594:1: warning: no previous prototype for function 'ist_exc_vmm_communication'

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git sev-es-client-tip-5.9
head:   7e2e0f5fb47e16dec0e6b81ce2ee36abb4c28eb9
commit: d77c36d3ce62e768feca12a9e9d2a8ddef7be2f8 [49/76] x86/sev-es: Add Runtime #VC Exception Handler
config: x86_64-randconfig-r002-20200818 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 790878f291fa5dc58a1c560cb6cc76fd1bfd1c5a)
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 d77c36d3ce62e768feca12a9e9d2a8ddef7be2f8
        # 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@intel.com>

All warnings (new ones prefixed by >>):

>> arch/x86/kernel/sev-es.c:594:1: warning: no previous prototype for function 'ist_exc_vmm_communication' [-Wmissing-prototypes]
   DEFINE_IDTENTRY_VC_IST(exc_vmm_communication)
   ^
   arch/x86/include/asm/idtentry.h:380:32: note: expanded from macro 'DEFINE_IDTENTRY_VC_IST'
           DEFINE_IDTENTRY_RAW_ERRORCODE(ist_##func)
                                         ^
   <scratch space>:270:1: note: expanded from here
   ist_exc_vmm_communication
   ^
   arch/x86/kernel/sev-es.c:594:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   arch/x86/include/asm/idtentry.h:380:2: note: expanded from macro 'DEFINE_IDTENTRY_VC_IST'
           DEFINE_IDTENTRY_RAW_ERRORCODE(ist_##func)
           ^
   arch/x86/include/asm/idtentry.h:167:19: note: expanded from macro 'DEFINE_IDTENTRY_RAW_ERRORCODE'
   __visible noinstr void func(struct pt_regs *regs, unsigned long error_code)
                     ^
   1 warning generated.

# https://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git/commit/?id=d77c36d3ce62e768feca12a9e9d2a8ddef7be2f8
git remote add joro https://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git
git fetch --no-tags joro sev-es-client-tip-5.9
git checkout d77c36d3ce62e768feca12a9e9d2a8ddef7be2f8
vim +/ist_exc_vmm_communication +594 arch/x86/kernel/sev-es.c

   592	
   593	/* This handler runs on the #VC fall-back stack. It can cause further #VC exceptions */
 > 594	DEFINE_IDTENTRY_VC_IST(exc_vmm_communication)
   595	{
   596		instrumentation_begin();
   597		panic("Can't handle #VC exception from unsupported context\n");
   598		instrumentation_end();
   599	}
   600	

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

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