On Thu, Jan 10, 2013 at 04:06:45PM +0000, Marc Zyngier wrote: > +int kvm_psci_call(struct kvm_vcpu *vcpu) > +{ > + unsigned long psci_fn = *vcpu_reg(vcpu, 0) & ~((u32) 0); > + unsigned long val; > + > + switch (psci_fn) { > + case KVM_PSCI_FN_CPU_OFF: > + kvm_psci_vcpu_off(vcpu); > + val = KVM_PSCI_RET_SUCCESS; > + break; > + case KVM_PSCI_FN_CPU_ON: > + val = kvm_psci_vcpu_on(vcpu); > + break; > + case KVM_PSCI_FN_CPU_SUSPEND: > + case KVM_PSCI_FN_MIGRATE: > + val = KVM_PSCI_RET_NI; > + break; > + > + default: > + return -1; > + } > + > + *vcpu_reg(vcpu, 0) = val; > + return 0; > +} We were discussing recently on #kernel about kernel APIs and the way that our integer-returning functions pretty much use 0 for success, and -errno for failures, whereas our pointer-returning functions are a mess. And above we have something returning -1 to some other chunk of code outside this compilation unit. That doesn't sound particularly clever to me. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html