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

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Date:	Mon, 27 Apr 2009 10:29:49 -0700
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Tim Abbott <tabbott@....EDU>
CC:	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>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Kyle McMartin <kyle@...artin.ca>,
	David Howells <dhowells@...hat.com>,
	Russell King <rmk+kernel@....linux.org.uk>
Subject: RE: [PATCH 05/15] arm: convert to use __HEAD and HEAD_TEXT macros.

>> 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.

ia64 doesn't seem to care ... I changed the one use of .text.head
to be just .text.  There are a couple of new "section mismatches"
(start_ap -> start_secondary and start_ap -> start_kernel), but
it still boots.

> 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.

The start_ap code is still needed for hotplug cpu on ia64. So .text.init
won't work for me.

-Tony
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