netdev - Re: wireless vs. alignment requirements

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Message-ID: <20071124141319.GA27819@gondor.apana.org.au>
Date:	Sat, 24 Nov 2007 22:13:19 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	dsd@...too.org, davem@...emloft.net, netdev@...r.kernel.org,
	linux-wireless@...r.kernel.org
Subject: Re: wireless vs. alignment requirements

On Sat, Nov 24, 2007 at 02:49:36PM +0100, Johannes Berg wrote:
> 
> Right. I just didn't think that would be a valid value for an
> architecture to set.

OK.  Let me clarify this a bit more.  We require at least one
of the following rules to be met:

* the IPv4/IPv6 header is aligned by 8 bytes on reception;
* or the platform provides unaligned exception handlers.

So if your platform violates both rules then it won't work with
the IP stack, simple as that.  Fortunately I don't think such a
platform exists currently on Linux.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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