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From: Stephen Hemminger <shemminger@vyatta.com>
Subject: Re: [RFC] should we care of COMPAT mode in bridge ?
Date: Tue, 7 Jun 2011 16:54:21 -0700
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To: David Miller <davem@davemloft.net>
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On Mon, 06 Jun 2011 13:23:15 -0700 (PDT)
David Miller <davem@davemloft.net> wrote:

> From: Arnd Bergmann <arnd@arndb.de>
> Date: Mon, 6 Jun 2011 22:19:33 +0200
> 
> > I think it would be good to first understand why it doesn't work with the
> > new style ioctls that are in the kernel. The source code of brctl that
> > I'm looking at here contains:
> 
> Eric's 32-bit binary was built against older headers that didn't
> define the new ioctls.
> 
> That makes it pretty clear to me that we have to support those
> older ioctls in compat mode even after all these years.

That is really old, even Debian Lenny isn't that out of date.