Hi Sean, I love your patch! Yet something to improve: [auto build test ERROR on 17179d0068b20413de2355f84c75a93740257e20] url: https://github.com/0day-ci/linux/commits/Sean-Christopherson/KVM-x86-Prep... base: 17179d0068b20413de2355f84c75a93740257e20 config: x86_64-allmodconfig (https://download.01.org/0day-ci/archive/20220205/202202050720.YPm113nN-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/528172fca9c0e8fac06680430bf69a55e... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Sean-Christopherson/KVM-x86-Prep-work-for-VMX-IPI-virtualization/20220205-054418 git checkout 528172fca9c0e8fac06680430bf69a55e4559974 # save the config file to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/kvm/ 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 >>): arch/x86/kvm/svm/avic.c: In function 'avic_unaccel_trap_write': 486 | if (avic_handle_apic_id_update(&svm->vcpu)) | ^~~ | sem arch/x86/kvm/svm/avic.c:486:35: note: each undeclared identifier is reported only once for each function it appears in vim +486 arch/x86/kvm/svm/avic.c ef0f64960d012cb Joerg Roedel 2020-03-31 478 528172fca9c0e8f Sean Christopherson 2022-02-04 479 static int avic_unaccel_trap_write(struct kvm_vcpu *vcpu) ef0f64960d012cb Joerg Roedel 2020-03-31 480 { 528172fca9c0e8f Sean Christopherson 2022-02-04 481 u32 offset = to_svm(vcpu)->vmcb->control.exit_info_1 & ef0f64960d012cb Joerg Roedel 2020-03-31 482 AVIC_UNACCEL_ACCESS_OFFSET_MASK; ef0f64960d012cb Joerg Roedel 2020-03-31 483 ef0f64960d012cb Joerg Roedel 2020-03-31 484 switch (offset) { ef0f64960d012cb Joerg Roedel 2020-03-31 485 case APIC_ID: ef0f64960d012cb Joerg Roedel 2020-03-31 @486 if (avic_handle_apic_id_update(&svm->vcpu)) ef0f64960d012cb Joerg Roedel 2020-03-31 487 return 0; ef0f64960d012cb Joerg Roedel 2020-03-31 488 break; ef0f64960d012cb Joerg Roedel 2020-03-31 489 case APIC_LDR: 528172fca9c0e8f Sean Christopherson 2022-02-04 490 if (avic_handle_ldr_update(vcpu)) ef0f64960d012cb Joerg Roedel 2020-03-31 491 return 0; ef0f64960d012cb Joerg Roedel 2020-03-31 492 break; ef0f64960d012cb Joerg Roedel 2020-03-31 493 case APIC_DFR: 528172fca9c0e8f Sean Christopherson 2022-02-04 494 avic_handle_dfr_update(vcpu); ef0f64960d012cb Joerg Roedel 2020-03-31 495 break; ef0f64960d012cb Joerg Roedel 2020-03-31 496 default: ef0f64960d012cb Joerg Roedel 2020-03-31 497 break; ef0f64960d012cb Joerg Roedel 2020-03-31 498 } ef0f64960d012cb Joerg Roedel 2020-03-31 499 528172fca9c0e8f Sean Christopherson 2022-02-04 500 kvm_apic_write_nodecode(vcpu, offset); ef0f64960d012cb Joerg Roedel 2020-03-31 501 return 1; ef0f64960d012cb Joerg Roedel 2020-03-31 502 } ef0f64960d012cb Joerg Roedel 2020-03-31 503 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org