Hi Juergen, I love your patch! Yet something to improve: [auto build test ERROR on linus/master] [also build test ERROR on v5.10] [cannot apply to xen-tip/linux-next tip/x86/core tip/x86/asm 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: i386-randconfig-r021-20201217 (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/032ee351da7a8adab17b0306cf5908b02... 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 032ee351da7a8adab17b0306cf5908b02f5728d2 # save the attached .config to linux build tree make W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): ld: arch/x86/kernel/alternative.o: in function `paravirt_set_cap': vim +605 arch/x86/kernel/alternative.c 601 602 #ifdef CONFIG_PARAVIRT 603 static void __init paravirt_set_cap(void) 604 { 606 setup_force_cpu_cap(X86_FEATURE_PVUNLOCK); 607 609 setup_force_cpu_cap(X86_FEATURE_VCPUPREEMPT); 610 } 611 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org