netdev - Re: wireless extensions vs. 64-bit architectures

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Date:	Thu, 8 Mar 2007 11:13:22 -0800
From:	Jean Tourrilhes <jt@....hp.com>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	Michael Buesch <mb@...sch.de>, linux-wireless@...r.kernel.org,
	netdev <netdev@...r.kernel.org>, Jeff Garzik <jgarzik@...ox.com>,
	Dan Williams <dcbw@...hat.com>,
	Jouni Malinen <jkm@...icescape.com>
Subject: Re: wireless extensions vs. 64-bit architectures

On Thu, Mar 08, 2007 at 08:08:29PM +0100, Johannes Berg wrote:
> On Thu, 2007-03-08 at 10:49 -0800, Jean Tourrilhes wrote:
> 
> > 	A proper fix would involve forcing the alignement in the
> > kernel. Unfortunately, that would break 64bit->64bit configs. I think
> > I can build a workaround for this in iwlib.
> 
> Not easily I think. You'd have to get something that has a well-defined
> result and see whether padding is present or not. The MAC address might
> be good enough (due to len being 24 instead of the expected 20) though.
> Thing is that it's really hard to figure out (even at runtime) whether
> the kernel and machine are 64 or 32-bits.

	I'm looking into that. The good thing is that we have
redundant information, so we can check that things don't match. It's a
bit more complex because some of those take variable parameters.

> I'd think this is a kernel bug and 32-bit userspace should rightfully be
> able to expect 32-bit aligned structs, no? Actually fixing it in the
> kernel would not be trivial though.

	What we could do is have every 64 bit kernel return things on
a 32 bit boundary, irrespective of userspace used. That would break
current 64 bit userspace.

> johannes

	Thanks !

	Jean

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