linux-kernel - Re: [PATCH 05/15] arm: convert to use __HEAD and HEAD

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Message-ID: <20090428085653.GA28601@linux-mips.org>
Date:	Tue, 28 Apr 2009 10:56:53 +0200
From:	Ralf Baechle <ralf@...ux-mips.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Tim Abbott <tabbott@....EDU>, Sam Ravnborg <sam@...nborg.org>,
	Linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Anders Kaseorg <andersk@....EDU>,
	Waseem Daher <wdaher@....EDU>,
	Denys Vlasenko <vda.linux@...glemail.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Andi Kleen <andi@...stfloor.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Jeff Arnold <jbarnold@....EDU>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jon Masters <jonathan@...masters.org>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	"Theodore Ts'o" <tytso@....EDU>,
	Nikanth Karthikesan <knikanth@...e.de>,
	Arjan van de Ven <arjan@...radead.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	Américo Wang <xiyou.wangcong@...il.com>,
	Kyle McMartin <kyle@...artin.ca>,
	David Howells <dhowells@...hat.com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Tony Luck <tony.luck@...el.com>
Subject: Re: [PATCH 05/15] arm: convert to use __HEAD and HEAD_TEXT macros.

On Mon, Apr 27, 2009 at 10:06:26AM -0700, Linus Torvalds wrote:

> On Mon, 27 Apr 2009, Tim Abbott wrote:
> > 
> > Does .head.text actually need its own output section here?
> 
> Probably not. Does the ARM build system massage the end result some way 
> looking for that .text.head section in the end? As you note, nobody else 
> cares, and the proper patch may be more along the lines of something 
> below.
> 
> Of course, most other architectures put the "init" section at the end, and 
> leave the HEAD_TEXT in the regular text section, but I suspect the ARM way 
> of laying things out (init text first) is probably better, since it allows 
> you to free that head code too.

There are a few platforms were due to excess bootloader primitivity (read
the boot format is a simple blob) it is desireable to have the entry point
at the lowest address of the final image - because that is what the firmware
is expecting.

  Ralf
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