netdev - Re: Linux 2.6.35/TIPC 2.0 ABI breaking changes

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Message-Id: <20101018.151708.193712688.davem@davemloft.net>
Date:	Mon, 18 Oct 2010 15:17:08 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	paul.gortmaker@...driver.com
Cc:	luca@...cax.com.ar, jon.maloy@...csson.com,
	tipc-discussion@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: Linux 2.6.35/TIPC 2.0 ABI breaking changes

From: Paul Gortmaker <paul.gortmaker@...driver.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.
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