linux-kernel - Re: [PATCH] Introduce compat_u64 and compat

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Message-Id: <200706151355.57464.ak@suse.de>
Date:	Fri, 15 Jun 2007 13:55:57 +0200
From:	Andi Kleen <ak@...e.de>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Dave Airlie <airlied@...ux.ie>, linux-arch@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] Introduce compat_u64 and compat_s64 types

On Friday 15 June 2007 11:31:37 Arnd Bergmann wrote:
> One common problem with 32 bit system call and ioctl emulation
> is the different alignment rules between i386 and 64 bit machines.
> A number of drivers work around this by marking the compat
> structures as 'attribute((packed))', which is not the right
> solution because it breaks all the non-x86 architectures that
> want to use the same compat code.

Why does it break them? It should just make them a little slower.

The network code requires unaligned accesses to work
anyways so if your architecture doesn't support them it is already
remotely crashable.

-Andi

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