Hi Davidlohr, I love your patch! Yet something to improve: [auto build test ERROR on next-20200323] [also build test ERROR on v5.6-rc7] [cannot apply to kvm/linux-next kvmarm/next linus/master kvm-ppc/kvm-ppc-next v5.6-rc7 v5.6-rc6 v5.6-rc5] [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/Davidlohr-Bueso/kvm-Use-rcuwait-for-vcpu-blocking/20200324-155230 base: 5149100c3aebe5e640d6ff68e0b5e5a7eb8638e0 config: s390-randconfig-a001-20200324 (attached as .config) compiler: s390-linux-gcc (GCC) 9.2.0 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=9.2.0 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/kvm/../../../virt/kvm/kvm_main.c: In function 'kvm_vcpu_block': >> arch/s390/kvm/../../../virt/kvm/kvm_main.c:2698:16: error: macro "rcuwait_wait_event" passed 3 arguments, but takes just 2 2698 | TASK_IDLE); | ^ In file included from include/linux/percpu-rwsem.h:7, from include/linux/fs.h:34, from include/linux/huge_mm.h:8, from include/linux/mm.h:681, from include/linux/kvm_host.h:14, from arch/s390/kvm/../../../virt/kvm/kvm_main.c:18: include/linux/rcuwait.h:33: note: macro "rcuwait_wait_event" defined here 33 | #define rcuwait_wait_event(w, condition) \ | >> arch/s390/kvm/../../../virt/kvm/kvm_main.c:2696:2: error: 'rcuwait_wait_event' undeclared (first use in this function) 2696 | rcuwait_wait_event(&vcpu->wait, | ^~~~~~~~~~~~~~~~~~ arch/s390/kvm/../../../virt/kvm/kvm_main.c:2696:2: note: each undeclared identifier is reported only once for each function it appears in vim +/rcuwait_wait_event +2698 arch/s390/kvm/../../../virt/kvm/kvm_main.c 2664 2665 /* 2666 * The vCPU has executed a HLT instruction with in-kernel mode enabled. 2667 */ 2668 void kvm_vcpu_block(struct kvm_vcpu *vcpu) 2669 { 2670 ktime_t start, cur; 2671 u64 block_ns; 2672 int block_check = -EINTR; 2673 2674 kvm_arch_vcpu_blocking(vcpu); 2675 2676 start = cur = ktime_get(); 2677 if (vcpu->halt_poll_ns && !kvm_arch_no_poll(vcpu)) { 2678 ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns); 2679 2680 ++vcpu->stat.halt_attempted_poll; 2681 do { 2682 /* 2683 * This sets KVM_REQ_UNHALT if an interrupt 2684 * arrives. 2685 */ 2686 if (kvm_vcpu_check_block(vcpu) < 0) { 2687 ++vcpu->stat.halt_successful_poll; 2688 if (!vcpu_valid_wakeup(vcpu)) 2689 ++vcpu->stat.halt_poll_invalid; 2690 goto out; 2691 } 2692 cur = ktime_get(); 2693 } while (single_task_running() && ktime_before(cur, stop)); 2694 } 2695 > 2696 rcuwait_wait_event(&vcpu->wait, 2697 (block_check = kvm_vcpu_check_block(vcpu)) < 0, > 2698 TASK_IDLE); 2699 cur = ktime_get(); 2700 out: 2701 kvm_arch_vcpu_unblocking(vcpu); 2702 block_ns = ktime_to_ns(cur) - ktime_to_ns(start); 2703 2704 if (!kvm_arch_no_poll(vcpu)) { 2705 if (!vcpu_valid_wakeup(vcpu)) { 2706 shrink_halt_poll_ns(vcpu); 2707 } else if (halt_poll_ns) { 2708 if (block_ns <= vcpu->halt_poll_ns) 2709 ; 2710 /* we had a long block, shrink polling */ 2711 else if (vcpu->halt_poll_ns && block_ns > halt_poll_ns) 2712 shrink_halt_poll_ns(vcpu); 2713 /* we had a short halt and our poll time is too small */ 2714 else if (vcpu->halt_poll_ns < halt_poll_ns && 2715 block_ns < halt_poll_ns) 2716 grow_halt_poll_ns(vcpu); 2717 } else { 2718 vcpu->halt_poll_ns = 0; 2719 } 2720 } 2721 2722 trace_kvm_vcpu_wakeup(block_ns, !block_check, vcpu_valid_wakeup(vcpu)); 2723 kvm_arch_vcpu_block_finish(vcpu); 2724 } 2725 EXPORT_SYMBOL_GPL(kvm_vcpu_block); 2726 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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