tree: https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git locking/wip-cna head: 10a4e10d5ffc0dbbc4cda5b4f03f58d62f9b3e71 commit: 10a4e10d5ffc0dbbc4cda5b4f03f58d62f9b3e71 [4/4] locking/qspinlock: Introduce CNA into the slow path of qspinlock config: i386-alldefconfig (attached as .config) compiler: gcc-7 (Debian 7.5.0-5) 7.5.0 reproduce: git checkout 10a4e10d5ffc0dbbc4cda5b4f03f58d62f9b3e71 # save the attached .config to linux build tree make ARCH=i386 If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): arch/x86/kernel/alternative.c: In function 'alternative_instructions': cna_configure_spin_lock_slowpath(); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/cna_configure_spin_lock_slowpath +742 arch/x86/kernel/alternative.c 741 743 744 apply_paravirt(__parainstructions, __parainstructions_end); 745 746 restart_nmi(); 747 alternatives_patched = 1; 748 } 749 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org