tree: https://git.kernel.org/pub/scm/linux/kernel/git/kas/linux.git kvm-unmapped-poison head: e792cd01c639cc658a27badfd07157668a7a5d53 commit: e792cd01c639cc658a27badfd07157668a7a5d53 [7/7] KVM: unmap guest memory with poison config: i386-allmodconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/kas/linux.git/commit/?id=... git remote add kas https://git.kernel.org/pub/scm/linux/kernel/git/kas/linux.git git fetch --no-tags kas kvm-unmapped-poison git checkout e792cd01c639cc658a27badfd07157668a7a5d53 # 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 >>, old ones prefixed by <<): ERROR: modpost: "walk_page_range" [arch/x86/kvm/kvm.ko] undefined! ERROR: modpost: "pmd_clear_bad" [arch/x86/kvm/kvm.ko] undefined! --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org