From owner-freebsd-hackers@FreeBSD.ORG  Tue May  3 09:18:18 2005
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 24A7516A4CE
	for <freebsd-hackers@freebsd.org>;
	Tue,  3 May 2005 09:18:18 +0000 (GMT)
Received: from itchy.rabson.org (mailgate.nlsystems.com [80.177.232.242])
	by mx1.FreeBSD.org (Postfix) with ESMTP id E6FCE43D6A
	for <freebsd-hackers@freebsd.org>;
	Tue,  3 May 2005 09:18:14 +0000 (GMT)
	(envelope-from dfr@nlsystems.com)
Received: from herring.rabson.org (herring [10.0.0.2])
	by itchy.rabson.org (8.13.3/8.12.11) with ESMTP id j439I6k7028836;
	Tue, 3 May 2005 10:18:09 +0100 (BST)
	(envelope-from dfr@nlsystems.com)
From: Doug Rabson <dfr@nlsystems.com>
To: freebsd-hackers@freebsd.org
Date: Tue, 3 May 2005 10:18:05 +0100
User-Agent: KMail/1.8
References: <427195400000512D@ims3a.cp.tin.it>
In-Reply-To: <427195400000512D@ims3a.cp.tin.it>
MIME-Version: 1.0
Content-Type: text/plain;
  charset="iso-8859-15"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
Message-Id: <200505031018.06023.dfr@nlsystems.com>
X-Spam-Status: No, score=-2.8 required=5.0 tests=ALL_TRUSTED autolearn=failed 
	version=3.0.2
X-Spam-Checker-Version: SpamAssassin 3.0.2 (2004-11-16) on itchy.rabson.org
X-Virus-Scanned: ClamAV 0.83/865/Tue May  3 00:16:49 2005 on itchy.rabson.org
X-Virus-Status: Clean
cc: gerarra@tin.it
Subject: Re: A question about /sys/kern/link_elf.c
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/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: Tue, 03 May 2005 09:18:18 -0000

On Monday 02 May 2005 13:35, gerarra@tin.it wrote:
> >There is a "#ifdef SPARSE_MAPPING" at line 701,and again a "#ifdef
> >SPARSE_MAPPING" at line 713.I just can't understand the second
> >one.Does it have any special mean ?
> >
> >thanks .
>
> It's just conditional compiling construct...however as you can see in
> the tag "For whatever reason, SPARSE_MAPPING is not even a config
> option, so this is dead code."

It dates back to a tools problem that I had on the alpha where the 
linker would round up the size of the text segment to the next megabyte 
boundary.