tree: https://git.kernel.org/pub/scm/virt/kvm/kvm.git queue head: 31afb2ea2b10a7d17ce3db4cdb0a12b63b2fe08a commit: cd39e1176d320157831ce030b4c869bd2d5eb142 [3/5] KVM: VMX: extract __pi_post_block config: i386-randconfig-x076-201739 (attached as .config) compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 reproduce: git checkout cd39e1176d320157831ce030b4c869bd2d5eb142 # save the attached .config to linux build tree make ARCH=i386 All warnings (new ones prefixed by >>): In file included from arch/x86/include/asm/atomic.h:7:0, from include/linux/atomic.h:4, from include/linux/mm_types_task.h:12, from include/linux/mm_types.h:4, from arch/x86/kvm/irq.h:25, from arch/x86/kvm/vmx.c:19: arch/x86/kvm/vmx.c: In function '__pi_post_block': >> arch/x86/include/asm/cmpxchg.h:129:2: warning: '__ret' is used uninitialized in this function [-Wuninitialized] __ret; \ ^~~~~ arch/x86/include/asm/cmpxchg.h:86:21: note: '__ret' was declared here __typeof__(*(ptr)) __ret; \ ^ arch/x86/include/asm/cmpxchg.h:133:2: note: in expansion of macro '__raw_cmpxchg' __raw_cmpxchg((ptr), (old), (new), (size), LOCK_PREFIX) ^~~~~~~~~~~~~ arch/x86/include/asm/cmpxchg.h:148:2: note: in expansion of macro '__cmpxchg' __cmpxchg(ptr, old, new, sizeof(*(ptr))) ^~~~~~~~~ >> arch/x86/kvm/vmx.c:11730:11: note: in expansion of macro 'cmpxchg' } while (cmpxchg(&pi_desc->control, old.control, ^~~~~~~ -- In file included from arch/x86/include/asm/atomic.h:7:0, from include/linux/atomic.h:4, from include/linux/mm_types_task.h:12, from include/linux/mm_types.h:4, from arch/x86//kvm/irq.h:25, from arch/x86//kvm/vmx.c:19: arch/x86//kvm/vmx.c: In function '__pi_post_block': >> arch/x86/include/asm/cmpxchg.h:129:2: warning: '__ret' is used uninitialized in this function [-Wuninitialized] __ret; \ ^~~~~ arch/x86/include/asm/cmpxchg.h:86:21: note: '__ret' was declared here __typeof__(*(ptr)) __ret; \ ^ arch/x86/include/asm/cmpxchg.h:133:2: note: in expansion of macro '__raw_cmpxchg' __raw_cmpxchg((ptr), (old), (new), (size), LOCK_PREFIX) ^~~~~~~~~~~~~ arch/x86/include/asm/cmpxchg.h:148:2: note: in expansion of macro '__cmpxchg' __cmpxchg(ptr, old, new, sizeof(*(ptr))) ^~~~~~~~~ arch/x86//kvm/vmx.c:11730:11: note: in expansion of macro 'cmpxchg' } while (cmpxchg(&pi_desc->control, old.control, ^~~~~~~ vim +/cmpxchg +11730 arch/x86/kvm/vmx.c 11707 11708 static void __pi_post_block(struct kvm_vcpu *vcpu) 11709 { 11710 struct pi_desc *pi_desc = vcpu_to_pi_desc(vcpu); 11711 struct pi_desc old, new; 11712 unsigned int dest; 11713 unsigned long flags; 11714 11715 do { 11716 old.control = new.control = pi_desc->control; 11717 11718 dest = cpu_physical_id(vcpu->cpu); 11719 11720 if (x2apic_enabled()) 11721 new.ndst = dest; 11722 else 11723 new.ndst = (dest << 8) & 0xFF00; 11724 11725 /* Allow posting non-urgent interrupts */ 11726 new.sn = 0; 11727 11728 /* set 'NV' to 'notification vector' */ 11729 new.nv = POSTED_INTR_VECTOR; 11730 } while (cmpxchg(&pi_desc->control, old.control, 11731 new.control) != old.control); 11732 11733 if(vcpu->pre_pcpu != -1) { 11734 spin_lock_irqsave( 11735 &per_cpu(blocked_vcpu_on_cpu_lock, 11736 vcpu->pre_pcpu), flags); 11737 list_del(&vcpu->blocked_vcpu_list); 11738 spin_unlock_irqrestore( 11739 &per_cpu(blocked_vcpu_on_cpu_lock, 11740 vcpu->pre_pcpu), flags); 11741 vcpu->pre_pcpu = -1; 11742 } 11743 } 11744 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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