linux-kernel - Re: [PATCH v3 1/3] Make section names compatible with -ffunction-sections -fdata-sections

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Message-ID: <20090426091505.GB27809@uranus.ravnborg.org>
Date:	Sun, 26 Apr 2009 11:15:05 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Paul Mundt <lethal@...ux-sh.org>, Tim Abbott <tabbott@....EDU>,
	Linus Torvalds <torvalds@...ux-foundation.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>,
	Am?rico Wang <xiyou.wangcong@...il.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH v3 1/3] Make section names compatible with -ffunction-sections -fdata-sections

On Sun, Apr 26, 2009 at 11:42:21AM +0900, Paul Mundt wrote:
> On Sat, Apr 25, 2009 at 10:10:38PM -0400, Tim Abbott wrote:
> > On Fri, 24 Apr 2009, Sam Ravnborg wrote:
> > 
> > > This patch touches far too many files.
> > > We should try to work out a method so we are in better control
> > > of the section names, so renaming in the end is a simple patch
> > > touching only a few files.
> > 
> > OK, I'm now planning to implement this approach.
> > 
> > > > -.section .text.head, "ax"
> > > > +.section .text..head, "ax"
> > > 
> > > Use __HEAD (from include/linux/init.h)
> > > Same goes for all other uses of .text.head.
> > 
> > I notice that __HEAD uses .head.text, while some architectures use 
> > .text.head.  It looks like this is just an inconsistency across 
> > architectures that will be removed as a consequence of this cleanup work 
> > (no architecture uses both .head.text and .text.head).
> > 
> The use of .text.head is quite intentional. See
> f8657e1b55901e6c227094258d1fa3642fa242bd for starters. Most of the rest
> of the platforms that switched did so for section mismatch avoidance
> reasons, those that kept .head.text presumably did not hit these
> mismatches or simply didn't care.

This is a mess that Tim's patches should clean up.
i386 should use .head.text - this is the 'correct' name for the head section.

And modpost does not accept ".text.head" anymore - thats cleaned up some time ago.

	Sam

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