Hi Like, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on tip/perf/core] [also build test WARNING on vhost/linux-next v5.7-rc3 next-20200424] [cannot apply to kvm/linux-next] [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/Like-Xu/Guest-Last-Branch-Recording-Enabling/20200426-123735 base: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 87cfeb1920f84f465a738d4c6589033eefa20b45 reproduce: # apt-get install sparse # sparse version: v0.6.1-191-gc51a0382-dirty make ARCH=x86_64 allmodconfig make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp@xxxxxxxxx> sparse warnings: (new ones prefixed by >>) arch/x86/kvm/pmu.c:190:18: sparse: sparse: incompatible types in comparison expression (different address spaces): arch/x86/kvm/pmu.c:190:18: sparse: struct kvm_pmu_event_filter [noderef] <asn:4> * arch/x86/kvm/pmu.c:190:18: sparse: struct kvm_pmu_event_filter * arch/x86/kvm/pmu.c:251:18: sparse: sparse: incompatible types in comparison expression (different address spaces): arch/x86/kvm/pmu.c:251:18: sparse: struct kvm_pmu_event_filter [noderef] <asn:4> * arch/x86/kvm/pmu.c:251:18: sparse: struct kvm_pmu_event_filter * >> arch/x86/kvm/pmu.c:455:6: sparse: sparse: symbol 'kvm_pmu_lbr_cleanup' was not declared. Should it be static? arch/x86/kvm/pmu.c:524:18: sparse: sparse: incompatible types in comparison expression (different address spaces): arch/x86/kvm/pmu.c:524:18: sparse: struct kvm_pmu_event_filter [noderef] <asn:4> * arch/x86/kvm/pmu.c:524:18: sparse: struct kvm_pmu_event_filter * arch/x86/kvm/pmu.c:524:18: sparse: sparse: incompatible types in comparison expression (different address spaces): arch/x86/kvm/pmu.c:524:18: sparse: struct kvm_pmu_event_filter [noderef] <asn:4> * arch/x86/kvm/pmu.c:524:18: sparse: struct kvm_pmu_event_filter * Please review and possibly fold the followup patch. --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx