Re: [kvm-devel] [PATCH 08/15] KVM: Add method to check for backwards-compatibleAPI extensions

[Avi Kivity]

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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