linux-kernel - Re: [PATCH v2] Add preadv and pwritev system calls.

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Message-ID: <18757.55706.609537.196994@drongo.ozlabs.ibm.com>
Date:	Mon, 15 Dec 2008 15:14:18 +1100
From:	Paul Mackerras <paulus@...ba.org>
To:	Matthew Wilcox <matthew@....cx>
Cc:	Gerd Hoffmann <kraxel@...hat.com>, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH v2] Add preadv and pwritev system calls.

Matthew Wilcox writes:

> On Fri, Dec 12, 2008 at 03:00:40PM +0100, Gerd Hoffmann wrote:
> > The patch sports the actual system call implementation and the windup in
> > the x86 system call tables.  Other archs are TBD.
> 
> > +asmlinkage ssize_t sys_preadv(unsigned long fd, const struct iovec __user *vec,
> > +                              unsigned long vlen, loff_t pos)
> > +asmlinkage ssize_t sys_pwritev(unsigned long fd, const struct iovec __user *vec,
> > +                               unsigned long vlen, loff_t pos)
> 
> Are these prototypes required?  MIPS and PARISC will need wrappers to
> fix them if they are.  These two architectures have an ABI which
> requires 64-bit arguments to be passed in aligned pairs of registers,

As does 32-bit PowerPC, so I also would prefer the alternate argument
order for the syscall (pos as the 3rd argument).

Paul.
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