linux-kernel - Re: [tip:x86/urgent] x86: Add back _end symbol that is missing from Symbol.map

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Message-ID: <4AF86211.3070103@zytor.com>
Date:	Mon, 09 Nov 2009 10:40:17 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Sam Ravnborg <sam@...nborg.org>
CC:	Ingo Molnar <mingo@...e.hu>, mingo@...hat.com,
	linux-kernel@...r.kernel.org, hare@...e.de,
	akpm@...ux-foundation.org, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/urgent] x86: Add back _end symbol that is missing	from
 Symbol.map

On 11/08/2009 04:38 AM, Sam Ravnborg wrote:
> I think ld discards zero size sections. No need to keep them around
> if they are empty.
> 
> Following patch should fix it up in a better way.
> I reused most of Hannes changelog.

Part of me wonders if this isn't better handled by just making relocs.c
deal with _end as a special case (and of course making it possible to
add others.)

Here is a distinctively non-minimal patch -- I used a modified version
of relocs.c for the Syslinux project, and this is basically a backport
of the changes I did for that.  It uses a regex to match either
known-absolute or known-relative symbols; the remaining changes are
mostly just dealing with particularly stupid code like using printf() to
do the work of fwrite(), and using select() where appropriate.

Sam, Ingo: I'd appreciate your opinions before checking anything in on this.

	-hpa

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