On 11/01/13 17:12, Russell King - ARM Linux wrote:
> 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.
The original code used to return -EINVAL, see:
https://lists.cs.columbia.edu/pipermail/kvmarm/2013-January/004509.html
Christoffer (Cc-ed) didn't like this, hence the -1. I'm happy to revert
the code to its original state though.
M.
--
Jazz is not dead. It just smells funny...
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