From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Subject: Re: Debian 3.16.7-ckt9-2 issue with lttng-modules kmem
	probe
Date: Fri, 24 Apr 2015 17:45:56 +0000 (UTC)
Message-ID: <1563471161.35791.1429897556370.JavaMail.zimbra__28340.6017617837$1429897619$gmane$org@efficios.com>
References: <1082981755.35270.1429823095435.JavaMail.zimbra@efficios.com>
 <844104542.35292.1429823245769.JavaMail.zimbra@efficios.com>
 <20150424165935.GA5843@helmut>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Return-path: <lttng-dev-bounces@lists.lttng.org>
Received: from mail.efficios.com ([78.47.125.74])
 by ltt.polymtl.ca with esmtp (Exim 4.80)
 (envelope-from <compudj@efficios.com>) id 1Ylhfq-0007iT-3e
 for lttng-dev@lists.lttng.org; Fri, 24 Apr 2015 13:45:58 -0400
In-Reply-To: <20150424165935.GA5843@helmut>
List-Unsubscribe: <http://lists.lttng.org/cgi-bin/mailman/options/lttng-dev>,
 <mailto:lttng-dev-request@lists.lttng.org?subject=unsubscribe>
List-Archive: <http://lists.lttng.org/pipermail/lttng-dev/>
List-Post: <mailto:lttng-dev@lists.lttng.org>
List-Help: <mailto:lttng-dev-request@lists.lttng.org?subject=help>
List-Subscribe: <http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev>,
 <mailto:lttng-dev-request@lists.lttng.org?subject=subscribe>
Errors-To: lttng-dev-bounces@lists.lttng.org
To: Jon Bernard <jbernard@debian.org>
Cc: lttng-dev <lttng-dev@lists.lttng.org>, Alexandre Montplaisir <alexmonthy@efficios.com>
List-Id: lttng-dev@lists.lttng.org

----- Original Message -----
> * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> wrote:
> > Hi Jon,
> > 
> > It appears that lttng-modules cannot build on the
> > Debian kernel 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt9-2 (2015-04-13)
> > x86_64 GNU/Linux.
> > 
> > It appears that their exported kmem.h header differs from
> > the upstream stable branch, but AFAIK there is no Debian-specific
> > version number available to distinguish between upstream stable
> > and the Debian kernel.
> 
> Indeed.  The only distinguishing characteristic I see is EXTRAVERSION
> defined to '-ckt9'.  I haven't had a chance to try yet, but could that
> be acceptable?

No, because we need to do conditionals comparing numeric values
both in Makefiles and within C.

> 
> > We have been hit by this in the past for Ubuntu kernels, and the
> > solution has been to introduce a UTS_UBUNTU_RELEASE_ABI define
> > into their kernels, which can be used to follow their own kernel
> > versions.
> > 
> > Do you think we could ask Debian to do the same ?
> 
> I'm happy to ask, the argument is certainly sound.

Thanks!

Mathieu

> 
> --
> Jon
> 

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com