Hi Juergen, I love your patch! Yet something to improve: [auto build test ERROR on linus/master] [cannot apply to xen-tip/linux-next tip/x86/core tip/x86/asm v5.10 next-20201217] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Juergen-Gross/x86-major-paravirt... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git accefff5b547a9a1d959c7e76ad539bf2480e78b config: x86_64-randconfig-a002-20201217 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/bc3cbe0ff1b123a4b7f48c91b32198d7d... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Juergen-Gross/x86-major-paravirt-cleanup/20201217-173646 git checkout bc3cbe0ff1b123a4b7f48c91b32198d7dfe57797 # save the attached .config to linux build tree make W=1 ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All error/warnings (new ones prefixed by >>): arch/x86/entry/entry_64.S: Assembler messages: vim +1092 arch/x86/entry/entry_64.S ddeb8f2149de280 arch/x86/kernel/entry_64.S Alexander van Heukelum 2008-11-24 1089 424c7d0a9a396ba arch/x86/entry/entry_64.S Thomas Gleixner 2020-03-26 1090 SYM_CODE_START_LOCAL(error_return) 424c7d0a9a396ba arch/x86/entry/entry_64.S Thomas Gleixner 2020-03-26 1091 UNWIND_HINT_REGS 424c7d0a9a396ba arch/x86/entry/entry_64.S Thomas Gleixner 2020-03-26 @1092 DEBUG_ENTRY_ASSERT_IRQS_OFF 424c7d0a9a396ba arch/x86/entry/entry_64.S Thomas Gleixner 2020-03-26 1093 testb $3, CS(%rsp) 424c7d0a9a396ba arch/x86/entry/entry_64.S Thomas Gleixner 2020-03-26 1094 jz restore_regs_and_return_to_kernel 424c7d0a9a396ba arch/x86/entry/entry_64.S Thomas Gleixner 2020-03-26 1095 jmp swapgs_restore_regs_and_return_to_usermode 424c7d0a9a396ba arch/x86/entry/entry_64.S Thomas Gleixner 2020-03-26 1096 SYM_CODE_END(error_return) 424c7d0a9a396ba arch/x86/entry/entry_64.S Thomas Gleixner 2020-03-26 1097 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org