tree: https://git.kernel.org/pub/scm/virt/kvm/kvm.git queue head: af2d88135e63f77ddf021a45b83acbe62d4feeb2 commit: 78683bff7243622e9b7e3fa79c64af2ec5305f43 [10/13] KVM: VMX: extract __pi_post_block config: i386-allmodconfig (attached as .config) compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 reproduce: git checkout 78683bff7243622e9b7e3fa79c64af2ec5305f43 # 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:11312:11: note: in expansion of macro 'cmpxchg' } while (cmpxchg(&pi_desc->control, old.control, ^~~~~~~ vim +/cmpxchg +11312 arch/x86/kvm/vmx.c 11289 11290 static void __pi_post_block(struct kvm_vcpu *vcpu) 11291 { 11292 struct pi_desc *pi_desc = vcpu_to_pi_desc(vcpu); 11293 struct pi_desc old, new; 11294 unsigned int dest; 11295 unsigned long flags; 11296 11297 do { 11298 old.control = new.control = pi_desc->control; 11299 11300 dest = cpu_physical_id(vcpu->cpu); 11301 11302 if (x2apic_enabled()) 11303 new.ndst = dest; 11304 else 11305 new.ndst = (dest << 8) & 0xFF00; 11306 11307 /* Allow posting non-urgent interrupts */ 11308 new.sn = 0; 11309 11310 /* set 'NV' to 'notification vector' */ 11311 new.nv = POSTED_INTR_VECTOR; 11312 } while (cmpxchg(&pi_desc->control, old.control, 11313 new.control) != old.control); 11314 11315 if(vcpu->pre_pcpu != -1) { 11316 spin_lock_irqsave( 11317 &per_cpu(blocked_vcpu_on_cpu_lock, 11318 vcpu->pre_pcpu), flags); 11319 list_del(&vcpu->blocked_vcpu_list); 11320 spin_unlock_irqrestore( 11321 &per_cpu(blocked_vcpu_on_cpu_lock, 11322 vcpu->pre_pcpu), flags); 11323 vcpu->pre_pcpu = -1; 11324 } 11325 } 11326 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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