From mboxrd@z Thu Jan  1 00:00:00 1970
From: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: + preadv-pwritev-add-preadv-and-pwritev-system-calls.patch added
 to -mm tree
Date: Mon, 02 Feb 2009 13:51:27 -0800
Message-ID: <49876ADF.80201@zytor.com>
References: <200902022135.n12LZa1a010673@imap1.linux-foundation.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Return-path: <linux-arch-owner@vger.kernel.org>
In-Reply-To: <200902022135.n12LZa1a010673@imap1.linux-foundation.org>
Sender: linux-arch-owner@vger.kernel.org
To: akpm@linux-foundation.org
Cc: mm-commits@vger.kernel.org, kraxel@redhat.com, arnd@arndb.de, linux-api@vger.kernel.org, linux-arch@vger.kernel.org, mingo@elte.hu, ralf@linux-mips.org, tglx@linutronix.de, viro@zeniv.linux.org.uk
List-Id: linux-api@vger.kernel.org

> 
> This prototype has one problem though: On 32bit archs is the (64bit)
> offset argument unaligned, which the syscall ABI of several archs doesn't
> allow to do.  At least s390 needs a wrapper in glibc to handle this.  As
> we'll need a wrappers in glibc anyway I've decided to push problem to
> glibc entriely and use a syscall prototype which works without
> arch-specific wrappers inside the kernel: The offset argument is
> explicitly splitted into two 32bit values.
> 

This is also an excellent example of why having syscall stubs 
autogenerated would be a very good thing, to avoid these kinds of 
abortions polluting the ABIs of *every* architecture...

	-hpa