linux-kernel - Re: [RFC] Documentation about unaligned memory access

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Message-ID: <20071123012911.3266dba6@the-village.bc.nu>
Date:	Fri, 23 Nov 2007 01:29:11 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Daniel Drake <dsd@...too.org>
Cc:	linux-kernel@...r.kernel.org, davem@...emloft.net,
	kune@...ne-taler.de, johannes@...solutions.net
Subject: Re: [RFC] Documentation about unaligned memory access

> Most architectures are unable to perform unaligned memory accesses. Any
> unaligned access causes a processor exception.

Not all. Some simply produce the wrong answer - thats oh so much more
exciting.

> You may be wondering why you have never seen these problems on your own
> architecture. Some architectures (such as i386 and x86_64) do not have this
> limitation, but nevertheless it is important for you to write portable code
> that works everywhere.

Its usually faster if you don't misalign on x86 as well.

Alan
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