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

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Date:	Sat, 24 Mar 2007 16:04:46 +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 3/23/07, Arjan van de Ven <arjan@...radead.org> wrote:
> On Fri, 2007-03-23 at 16:47 +0100, Marcel Siegert wrote:
> > On Friday 23 March 2007, Robert P. J. Day wrote:
> > >
> > > Delete the unreferenced header file include/linux/dvb/version.h.
> > >
> > > Signed-off-by: Robert P. J. Day <rpjday@...dspring.com>
> > >
> > NACK
> > this header is unreferenced in kernel, but used for applications that compile for userspace
> > to determine the api version.
>
>
> btw that is something extremely evil to do. Either you have varying apis
> between kernels (which is naughty, but I suppose you can go up in
> capabilities) or it's fully static.
>


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



Regards,
Manu
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