linux-kernel - Re: [PATCH] signalfd: fill in ssi_int for posix timers and message queues

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Date:	Sat, 24 Jul 2010 21:09:21 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Nathan Lynch <ntl@...ox.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	stable@...nel.org
Subject: Re: [PATCH] signalfd: fill in ssi_int for posix timers and message
 queues

On Tue, 20 Jul 2010, Andrew Morton wrote:

> It's not a matter of a current application depending on current
> behaviour!  The problem is that an application written in 2018 which
> depends on the _new_ behaviour will not work on 2.6.34.
> 
> It wouldn't be the worst thing we've ever done to our long-suffering
> users, but it is a permanent cost of having screwed things up :(

While I agree it is a problem with the kernel compatibility handling, 
every time we add new features to an existing interface we end up in 
similar scenarios.
Nowadays a "require kernel >= X.Y.Z" is all but an uncommon case for 
userspace code.


- Davide

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