[tip:x86/seves 63/75] arch/x86/kernel/sev-es.o: warning: objtool: ist_exc_vmm_communication()+0x12: unreachable instruction

[kernel test robot]

CC: linux-...@vger.kernel.org
CC: x...@kernel.org
TO: Joerg Roedel <jro...@suse.de>
CC: Borislav Petkov <b...@suse.de>

tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/seves
head: e6eb15c9ba3165698488ae5c34920eea20eaa38e
commit: cb1ad3ecea959593400dfac4f027dbc005e62c39 [63/75] x86/sev-es: Handle #DB Events
config: x86_64-randconfig-r001-20200913 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project b2c32c90bab09a6e2c1f370429db26017a182143)
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 cb1ad3ecea959593400dfac4f027dbc005e62c39
# 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 <l...@intel.com>

All warnings (new ones prefixed by >>):

>> arch/x86/kernel/sev-es.o: warning: objtool: ist_exc_vmm_communication()+0x12: unreachable instruction

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