linux-kernel - Re: [v4l-dvb-maintainer] [PATCH] DVB: Delete unused header file linux/dvb/version.h.

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Date:	Sun, 25 Mar 2007 16:03:38 +0400
From:	"Manu Abraham" <abraham.manu@...il.com>
To:	"Arjan van de Ven" <arjan@...radead.org>
Cc:	"Marcel Siegert" <mws@...uxtv.org>,
	"Andrew Morton" <akpm@...l.org>, v4l-dvb-maintainer@...uxtv.org,
	"Robert P. J. Day" <rpjday@...dspring.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: [v4l-dvb-maintainer] [PATCH] DVB: Delete unused header file linux/dvb/version.h.

On 3/25/07, Arjan van de Ven <arjan@...radead.org> wrote:
>
>
> > There are cases where we need an API update since newer systems do show up.
> > In such a case, the only way is to provide backward compatibility
> > while adding in newer stuff.
> >
> > Currently we use the version major/minor for the userspace to identify
> > the in kernel API, while the userspace apps can remain binary
> > compatible
>
> this is the problem exactly! Your userspace binary knows about the
> kernel headers it was compiled against, not about the actual running
> kernel! They are very likely not the same.

Well, we could go for an IOCTL in such a case to avoid the unpleasant scenario.


Manu
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