Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755095AbYJHJLg (ORCPT ); Wed, 8 Oct 2008 05:11:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754372AbYJHJL2 (ORCPT ); Wed, 8 Oct 2008 05:11:28 -0400 Received: from caramon.arm.linux.org.uk ([78.32.30.218]:48156 "EHLO caramon.arm.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754347AbYJHJL1 (ORCPT ); Wed, 8 Oct 2008 05:11:27 -0400 Date: Wed, 8 Oct 2008 10:10:55 +0100 From: Russell King To: Harvey Harrison Cc: David Howells , Andrew Morton , LKML Subject: Re: FRV/ARM unaligned access question Message-ID: <20081008091055.GB19322@flint.arm.linux.org.uk> References: <1223450773.8195.80.camel@brick> <20081008073519.GA19322@flint.arm.linux.org.uk> <1223451379.8195.88.camel@brick> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1223451379.8195.88.camel@brick> User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1361 Lines: 32 On Wed, Oct 08, 2008 at 12:36:19AM -0700, Harvey Harrison wrote: > On Wed, 2008-10-08 at 08:35 +0100, Russell King wrote: > > On Wed, Oct 08, 2008 at 12:26:13AM -0700, Harvey Harrison wrote: > > > I noticed that frv/arm are the only two arches that currently use open-coded > > > byteshifting routines for both the cpu endianness and the other endianness > > > whereas just about all the other arches use a packed-struct version for the > > > cpu-endian and then the byteshifting versions (lifted from arm) for the other > > > endianness. > > > > I'm sorry, I think you're mistaken. I've looked at x86, m68k and > > parisc, and they all use assembly for their swab functions in > > asm/byteorder.h. > > > > Sorry, not talking about byteorder at the moment, talking about > unaligned.h. At the moment, I've no idea what effect it'll have. I'd need to run some tests to discover what the effect will be. Not sure when I'll get around to that. If someone else can be found to evaluate what the effect would be... -- Russell King Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/ maintainer of: -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/