linux-kernel - Re: [kvm-devel] [PATCH 08/15] KVM: Add method to check for backwards-compatible API extensions

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Message-ID: <45FCF65C.2070800@qumranet.com>
Date:	Sun, 18 Mar 2007 10:20:44 +0200
From:	Avi Kivity <avi@...ranet.com>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
CC:	kvm-devel@...ts.sourceforge.net, Andrew Morton <akpm@...l.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [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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