From: Arnd Bergmann <arnd@arndb.de>
To: Kyle McMartin <kyle@mcmartin.ca>
Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [COMPAT] Add compat_merge64 helper
Date: Sat, 29 Sep 2007 01:52:12 +0200 [thread overview]
Message-ID: <200709290152.12842.arnd@arndb.de> (raw)
In-Reply-To: <20070929000131.GD25346@fattire.cabal.ca>
On Saturday 29 September 2007, Kyle McMartin wrote:
>
> 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?
>
s390 is big-endian as well, and while it does have really weird C calling
conventions for 64 bit arguments in 32 bit mode, these do not affect the
system call ABI, so we should be fine here.
ia64 and x86_64 are obviously little-endian, and I double-checked that they
work with this logic.
Arnd <><
next prev parent reply other threads:[~2007-09-29 0:07 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-28 22:33 [COMPAT] Add compat_merge64 helper Kyle McMartin
2007-09-28 22:33 ` [PATCH] Generic compat_sys_fallocate Kyle McMartin
2007-09-29 9:11 ` Geert Uytterhoeven
2007-09-28 23:38 ` [COMPAT] Add compat_merge64 helper Arnd Bergmann
2007-09-29 0:01 ` Kyle McMartin
2007-09-28 23:52 ` Arnd Bergmann [this message]
2007-09-29 0:02 ` Kyle McMartin
2007-09-29 7:23 ` Paul Mundt
2007-09-29 9:48 ` Heiko Carstens
2007-10-03 12:12 ` Ralf Baechle
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