From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: [PATCH 08/15] KVM: Add method to check for backwards-compatible API extensions Date: Sun, 18 Mar 2007 10:20:44 +0200 Message-ID: <45FCF65C.2070800@qumranet.com> References: <11736212072915-git-send-email-avi@qumranet.com> <1173621207256-git-send-email-avi@qumranet.com> <20070316150622.GC8525@osiris.boeblingen.de.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org, Andrew Morton , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Heiko Carstens Return-path: In-Reply-To: <20070316150622.GC8525-Pmgahw53EmNLmI7Nx2oIsGnsbthNF6/HVpNB7YpNyf8@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: kvm.vger.kernel.org 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 ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV