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Subject: Re: [PATCH] Introduce compat_u64 and compat_s64 types
From: David Woodhouse <dwmw2@infradead.org>
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Date: Sat, 16 Jun 2007 09:31:41 +0100
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To: Andi Kleen <ak@suse.de>
Cc: Robin Getz <rgetz@blackfin.uclinux.org>, Alan Cox <alan@lxorguk.ukuu.org.uk>, David Howells <dhowells@redhat.com>, Arnd Bergmann <arnd@arndb.de>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Dave Airlie <airlied@linux.ie>, linux-arch@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>, Bernd Schmidt <bernds_cb1@t-online.de>
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On Fri, 2007-06-15 at 23:22 +0200, Andi Kleen wrote:
> > For the architecture we use (Blackfin), it does not support unaligned
> > accesses, and we purposely never put in the trap/fixup code - we trap, and
> > printk("fix your source");
> 
> For the kernel you should fix up too in addition to the printk. Otherwise
> you risk a ping of death in the field with some more obscure protocol.
> Also the printk should be load limited.

Sometimes you can't. Some architectures don't even take a trap, and on
others (FR-V without MMU) it's an imprecise exception.

-- 
dwmw2