Hi Markus, [auto build test WARNING on kvm/linux-next] [also build test WARNING on v4.10-rc4 next-20170120] [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/SF-Markus-Elfring/KVM-Fine-tuning-for-several-function-implementations/20170123-022323 base: https://git.kernel.org/pub/scm/virt/kvm/kvm.git linux-next config: x86_64-allyesdebian (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=x86_64 All warnings (new ones prefixed by >>): arch/x86/kvm/../../../virt/kvm/kvm_main.c: In function 'kvm_make_all_cpus_request': >> arch/x86/kvm/../../../virt/kvm/kvm_main.c:187:7: warning: the address of 'cpus' will always evaluate as 'true' [-Waddress] if (cpus && cpu != -1 && cpu != me && ^~~~ vim +187 arch/x86/kvm/../../../virt/kvm/kvm_main.c 171 { 172 int i, cpu, me; 173 cpumask_var_t cpus; 174 bool called = true; 175 struct kvm_vcpu *vcpu; 176 177 zalloc_cpumask_var(&cpus, GFP_ATOMIC); 178 179 me = get_cpu(); 180 kvm_for_each_vcpu(i, vcpu, kvm) { 181 kvm_make_request(req, vcpu); 182 cpu = vcpu->cpu; 183 184 /* Set ->requests bit before we read ->mode. */ 185 smp_mb__after_atomic(); 186 > 187 if (cpus && cpu != -1 && cpu != me && 188 kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE) 189 cpumask_set_cpu(cpu, cpus); 190 } 191 if (unlikely(cpus == NULL)) 192 smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1); 193 else if (!cpumask_empty(cpus)) 194 smp_call_function_many(cpus, ack_flush, NULL, 1); 195 else --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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