[intel-tdx:guest-rebased 128/129] arch/x86/kernel/head_64.o: warning: objtool: verify_cpu()+0x4d: unreachable instruction

[kernel test robot]

tree:   https://github.com/intel/tdx.git guest-rebased
head:   6d6cab7288e23cfe0084bd1c214e3649146eb159
commit: fc9eb9756100201dbc23d220d3441115866085c8 [128/129] [REVERTME] x86/tdx: Add CONFIG option for KVM SDV workarounds
config: x86_64-defconfig (https://download.01.org/0day-ci/archive/20220316/202203162009.MT0Cnaca-lkp@xxxxxxxxx/config)
compiler: gcc-9 (Ubuntu 9.4.0-1ubuntu1~20.04) 9.4.0
reproduce (this is a W=1 build):
        # https://github.com/intel/tdx/commit/fc9eb9756100201dbc23d220d3441115866085c8
        git remote add intel-tdx https://github.com/intel/tdx.git
        git fetch --no-tags intel-tdx guest-rebased
        git checkout fc9eb9756100201dbc23d220d3441115866085c8
        # 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/

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/kernel/head_64.o: warning: objtool: verify_cpu()+0x4d: unreachable instruction

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0-DAY CI Kernel Test Service
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx