Hi Peter, Thank you for the patch! Yet something to improve: [auto build test ERROR on tip/auto-latest] [also build test ERROR on linus/master v5.6-rc4] [cannot apply to kvm/linux-next linux/master vhost/linux-next next-20200305] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Peter-Xu/KVM-Dirty-ring-interface/20200305-053531 base: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 6f2bc932d8ff72b1a0a5c66f3dad04ccba576a8b config: s390-alldefconfig (attached as .config) compiler: s390-linux-gcc (GCC) 7.5.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree GCC_VERSION=7.5.0 make.cross ARCH=s390 If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): arch/s390/../../virt/kvm/kvm_main.o: In function `kvm_reset_dirty_gfn': >> kvm_main.c:(.text+0x6a60): undefined reference to `kvm_arch_mmu_enable_log_dirty_pt_masked' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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