linux-kernel - Re: [COMPAT] Add compat

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Message-ID: <20070929000131.GD25346@fattire.cabal.ca>
Date:	Fri, 28 Sep 2007 20:01:31 -0400
From:	Kyle McMartin <kyle@...artin.ca>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [COMPAT] Add compat_merge64 helper

On Sat, Sep 29, 2007 at 01:38:23AM +0200, Arnd Bergmann wrote:
> 1. Byte order matches the order in which 64 bit arguments are split
>    in system call conventions on all platforms.

I checked powerpc, sparc, and mips, which are (besides parisc) the only
64-bit with 32-bit userspace big endian architectures that I could think
of offhand. A quick grep shows sh64 too... Paul?

> 2. Every user of compat_merge64() includes asm/byteorder.h
> 

*nod* Good point.

> Both should be easy to prove, but I'm not convinced until someone
> actually does it.
> 

Cheers,
	Kyle
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