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Date: Tue, 19 Oct 2010 00:58:19 +0100
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: David Miller <davem@davemloft.net>
Cc: paul.gortmaker@windriver.com, luca@llucax.com.ar, jon.maloy@ericsson.com,
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Subject: Re: Linux 2.6.35/TIPC 2.0 ABI breaking changes
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On Mon, 18 Oct 2010 15:17:08 -0700 (PDT)
David Miller <davem@davemloft.net> wrote:

> From: Paul Gortmaker <paul.gortmaker@windriver.com>
> Date: Mon, 18 Oct 2010 16:42:33 -0400
> 
> > If you have access to the user space code in question, you can just
> > switch behaviour semantics based on the results of a uname call, knowing
> > that this change was included in versions since approx last Feb.  There
> > is also /proc/version which can be parsed manually if you prefer.
> 
> Requiring userspace to check kernel versioning information in order
> to user an exported userspace API correctly is _ALWAYS_ _WRONG_.
> 
> You cannot and must not make backwards incompatible changes to
> userspace interfaces.
> 
> Really, you can't.

In which case given that most distros are shipping older stuff and care
about ABI stability presumably the bug should get fixed for 2.6.36 ?