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SubjectRe: [kvm-devel] [PATCH 08/15] KVM: Add method to check for backwards-compatible API extensions
Heiko Carstens wrote:
>> diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
>> index 747966e..376538c 100644
>> --- a/drivers/kvm/kvm_main.c
>> +++ b/drivers/kvm/kvm_main.c
>> @@ -2416,6 +2416,12 @@ static long kvm_dev_ioctl(struct file *filp,
>> r = 0;
>> break;
>> }
>> + case KVM_CHECK_EXTENSION:
>> + /*
>> + * No extensions defined at present.
>> + */
>> + r = 0;
>> + break;
>> default:
>>
>
> What exactly is this good for?
>

Extending the interface in a backwards compatible manner. When new
interfaces are added, it will return 1 (depending on arg) for
implemented extensions.

--
error compiling committee.c: too many arguments to function

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