From: Paul Mackerras Subject: Re: [PATCH 1/5] fallocate() implementation in i86, x86_64 and powerpc Date: Wed, 9 May 2007 21:37:22 +1000 Message-ID: <17985.45682.284634.969153@cargo.ozlabs.ibm.com> References: <20070418130600.GW5967@schatzie.adilger.int> <20070420135146.GA21352@amitarora.in.ibm.com> <20070420145918.GY355@devserv.devel.redhat.com> <20070424121632.GA10136@amitarora.in.ibm.com> <20070426175056.GA25321@amitarora.in.ibm.com> <20070426180332.GA7209@amitarora.in.ibm.com> <20070503212955.b1b6443c.akpm@linux-foundation.org> <17978.47502.786970.196554@cargo.ozlabs.ibm.com> <20070509101507.GA26056@in.ibm.com> <17985.42884.971318.859402@cargo.ozlabs.ibm.com> <20070509111011.GA21619@in.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: Andrew Morton , "Amit K. Arora" , torvalds@linux-foundation.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-ext4@vger.kernel.org, xfs@oss.sgi.com, cmm@us.ibm.com To: suparna@in.ibm.com Return-path: Received: from ozlabs.org ([203.10.76.45]:52625 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751690AbXEILh3 (ORCPT ); Wed, 9 May 2007 07:37:29 -0400 In-Reply-To: <20070509111011.GA21619@in.ibm.com> Sender: linux-ext4-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org Suparna Bhattacharya writes: > > Of course the interface used by an application program would have the > > fd first. Glibc can do the translation. > > I think that was understood. OK, then what does it matter what the glibc/kernel interface is, as long as it works? It's only a minor point; the order of arguments can vary between architectures if necessary, but it's nicer if they don't have to. 32-bit powerpc will need to have the two int arguments adjacent in order to avoid using more than 6 argument registers at the user/kernel boundary, and s390 will need to avoid having a 64-bit argument last (if I understand it correctly). Paul.