From owner-freebsd-hackers@FreeBSD.ORG  Sat Feb  2 10:55:35 2013
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@FreeBSD.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by hub.freebsd.org (Postfix) with ESMTP id E816F1BF;
 Sat,  2 Feb 2013 10:55:35 +0000 (UTC) (envelope-from avg@FreeBSD.org)
Received: from citadel.icyb.net.ua (citadel.icyb.net.ua [212.40.38.140])
 by mx1.freebsd.org (Postfix) with ESMTP id C2586A25;
 Sat,  2 Feb 2013 10:55:34 +0000 (UTC)
Received: from porto.starpoint.kiev.ua (porto-e.starpoint.kiev.ua
 [212.40.38.100])
 by citadel.icyb.net.ua (8.8.8p3/ICyb-2.3exp) with ESMTP id MAA28996;
 Sat, 02 Feb 2013 12:55:27 +0200 (EET) (envelope-from avg@FreeBSD.org)
Received: from localhost ([127.0.0.1])
 by porto.starpoint.kiev.ua with esmtp (Exim 4.34 (FreeBSD))
 id 1U1ako-00046L-QH; Sat, 02 Feb 2013 12:55:26 +0200
Message-ID: <510CF09C.7020109@FreeBSD.org>
Date: Sat, 02 Feb 2013 12:55:24 +0200
From: Andriy Gapon <avg@FreeBSD.org>
User-Agent: Mozilla/5.0 (X11; FreeBSD amd64;
 rv:17.0) Gecko/20130121 Thunderbird/17.0.2
MIME-Version: 1.0
To: John Baldwin <jhb@FreeBSD.org>
Subject: Re: some questions on kern_linker and pre-loaded modules
References: <5103C361.6060605@FreeBSD.org> <201301281040.38727.jhb@freebsd.org>
In-Reply-To: <201301281040.38727.jhb@freebsd.org>
X-Enigmail-Version: 1.4.6
Content-Type: text/plain; charset=ISO-8859-15
Content-Transfer-Encoding: 7bit
Cc: freebsd-hackers@FreeBSD.org, freebsd-current@FreeBSD.org
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
 <freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-hackers>, 
 <mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
 <mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 02 Feb 2013 10:55:36 -0000

on 28/01/2013 17:40 John Baldwin said the following:
> Yes, I think it is too hard at present to safely allow a linker file to
> override the same module in a kernel, so the duplicate linker file should
> just be rejected entirely.  I'm not sure if your change is completely
> correct for that.

Incidentally that particular patch was broken.
Here is a working patch:
http://people.freebsd.org/~avg/linker_file_register_modules-linker_kernel_file.diff

But I really need to get a better understanding of the bigger picture and then
discuss what has to be done in that scope.

I plan to write a larger response to your complete followup.
Thank you.

-- 
Andriy Gapon