[stable:linux-4.14.y 3640/5153] arch/x86/entry/.tmp_entry_64.o: warning: objtool: .entry.text+0x888: unreachable instruction

[stable:linux-4.14.y 3640/5153] arch/x86/entry/.tmp_entry_64.o: warning: objtool: .entry.text+0x888: unreachable instruction

[kernel test robot]

Hi Ben,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git linux-4.14.y
head:   80b73c056d2076d12f9e50c753bb440fc79f30c9
commit: 369e65def1a82aba54b377b6899b1bb5099ef838 [3640/5153] Revert "x86/speculation: Change FILL_RETURN_BUFFER to work with objtool"
config: x86_64-randconfig-073-20230824 (https://download.01.org/0day-ci/archive/20230824/202308242012.o6WHSxJT-lkp@intel.com/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce: (https://download.01.org/0day-ci/archive/20230824/202308242012.o6WHSxJT-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202308242012.o6WHSxJT-lkp@intel.com/

All warnings (new ones prefixed by >>):

   arch/x86/entry/entry_64.S: Assembler messages:
   arch/x86/entry/entry_64.S:1672: Warning: no instruction mnemonic suffix given and no register operands; using default for `sysret'
>> arch/x86/entry/.tmp_entry_64.o: warning: objtool: .entry.text+0x888: unreachable instruction


objdump-func vmlinux.o .entry.text:

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki