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

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Message-ID: <5717.1181909357@redhat.com>
Date:	Fri, 15 Jun 2007 13:09:17 +0100
From:	David Howells <dhowells@...hat.com>
To:	Andi Kleen <ak@...e.de>
Cc:	Arnd Bergmann <arnd@...db.de>,
	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

Andi Kleen <ak@...e.de> wrote:

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

Not all CPUs deliver recoverable misalignment exceptions.  This is probably
particularly true of NOMMU-mode archs where the CPU designed may have taken
the view that if a data exception is delivered, then the whole system is kaput
anyway and must be restarted.

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

I thought we'd fixed all that.

David
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