tree: https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git core/objtool-retpoline head: 2d0bc203dda415016103798c21ad24d38eac7a3e commit: 421b2dc7cb186ba7f78f72c96736a9972fa1c30c [22/24] x86/speculation: Change __FILL_RETURN_BUFFER to work with objtool config: i386-allyesconfig (attached as .config) compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0 reproduce: git checkout 421b2dc7cb186ba7f78f72c96736a9972fa1c30c # save the attached .config to linux build tree make ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): arch/x86/include/asm/nospec-branch.h: Assembler messages: vim +281 arch/x86/include/asm/nospec-branch.h dd84441a797150 David Woodhouse 2018-02-19 275 20ffa1caecca4d David Woodhouse 2018-01-25 276 static inline void indirect_branch_prediction_barrier(void) 20ffa1caecca4d David Woodhouse 2018-01-25 277 { 1b86883ccb8d5d Konrad Rzeszutek Wilk 2018-04-25 278 u64 val = PRED_CMD_IBPB; 1b86883ccb8d5d Konrad Rzeszutek Wilk 2018-04-25 279 1b86883ccb8d5d Konrad Rzeszutek Wilk 2018-04-25 280 alternative_msr_write(MSR_IA32_PRED_CMD, val, X86_FEATURE_USE_IBPB); 20ffa1caecca4d David Woodhouse 2018-01-25 @281 } 20ffa1caecca4d David Woodhouse 2018-01-25 282 :::::: The code at line 281 was first introduced by commit :::::: 20ffa1caecca4db8f79fe665acdeaa5af815a24d x86/speculation: Add basic IBPB (Indirect Branch Prediction Barrier) support :::::: TO: David Woodhouse <dwmw(a)amazon.co.uk&gt; :::::: CC: Thomas Gleixner <tglx(a)linutronix.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org