Hi Paolo, [auto build test WARNING on kvm/linux-next] [also build test WARNING on v4.12-rc4 next-20170606] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Paolo-Bonzini/VT-d-PI-fixes/20170607-042637 base: https://git.kernel.org/pub/scm/virt/kvm/kvm.git linux-next config: i386-randconfig-x012-201723 (attached as .config) compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 reproduce: # 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:11242:11: 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:11242:11: note: in expansion of macro 'cmpxchg' } while (cmpxchg(&pi_desc->control, old.control, ^~~~~~~ vim +/cmpxchg +11242 arch/x86/kvm/vmx.c 11226 11227 do { 11228 old.control = new.control = pi_desc->control; 11229 11230 dest = cpu_physical_id(vcpu->cpu); 11231 11232 if (x2apic_enabled()) 11233 new.ndst = dest; 11234 else 11235 new.ndst = (dest << 8) & 0xFF00; 11236 11237 /* Allow posting non-urgent interrupts */ 11238 new.sn = 0; 11239 11240 /* set 'NV' to 'notification vector' */ 11241 new.nv = POSTED_INTR_VECTOR; 11242 } while (cmpxchg(&pi_desc->control, old.control, 11243 new.control) != old.control); 11244 11245 if(vcpu->pre_pcpu != -1) { 11246 spin_lock_irqsave( 11247 &per_cpu(blocked_vcpu_on_cpu_lock, 11248 vcpu->pre_pcpu), flags); 11249 list_del(&vcpu->blocked_vcpu_list); 11250 spin_unlock_irqrestore( --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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