[tip:x86/seves 48/74] arch/x86/kernel/sev-es.o: warning: objtool: safe_stack_exc_vmm_communication()+0x209: unreachable instruction

[tip:x86/seves 48/74] arch/x86/kernel/sev-es.o: warning: objtool: safe_stack_exc_vmm_communication()+0x209: unreachable instruction

[kernel test robot]

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CC: linux-kernel(a)vger.kernel.org
CC: x86(a)kernel.org
TO: Tom Lendacky <thomas.lendacky@amd.com>
CC: Borislav Petkov <bp@suse.de>
CC: Joerg Roedel <jroedel@suse.de>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/seves
head:   f5ed777586e08e09c4b6f1e87161a145ee1431cf
commit: 0786138c78e79343c7b015d77507cbf9d5f15d00 [48/74] x86/sev-es: Add a Runtime #VC Exception Handler
config: x86_64-randconfig-a004-20200911 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 0a5dc7effb191eff740e0e7ae7bd8e1f6bdb3ad9)
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 0786138c78e79343c7b015d77507cbf9d5f15d00
        # 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.o: warning: objtool: safe_stack_exc_vmm_communication()+0x209: unreachable instruction

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

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