linux-kernel - Re: [PATCH] cris: Cleanup linker script using new linker script macros.

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Date:	Tue, 15 Sep 2009 09:33:13 +0200
From:	Jesper Nilsson <Jesper.Nilsson@...s.com>
To:	Tim Abbott <tabbott@...lice.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Sam Ravnborg <sam@...nborg.org>,
	Mikael Starvik <mikael.starvik@...s.com>,
	dev-etrax <dev-etrax@...s.com>
Subject: Re: [PATCH] cris: Cleanup linker script using new linker script
	macros.

On Mon, Sep 14, 2009 at 10:27:18PM +0200, Tim Abbott wrote:
> On Mon, 14 Sep 2009, Jesper Nilsson wrote:
> > On Mon, Sep 07, 2009 at 05:06:33AM +0200, Tim Abbott wrote:
> > >  	. = ALIGN (4);
> > >  	___data_start = . ;
> > >  	__Sdata = . ;
> > > -	.data : {			/* Data */
> > > -		DATA_DATA
> > > -	}
> > > +	RW_DATA_SECTION(0, PAGE_SIZE, PAGE_SIZE)
> > 
> > This causes some problems, and I'm not ldscript guru enough to immediately
> > grasp the problem. What I get is this:
> > 
> > ...
> >   LD      vmlinux
> > arch/cris/kernel/vmlinux.lds:326 cannot move location counter backwards (from c017e000 to 00000000)
> > make[1]: *** [vmlinux] Error 1
> > make: *** [sub-make] Error 2
> 
> Hmm.  I spent a bit looking at it, and I don't have a guess for what the 
> problem is there.
> 
> > I've dropped that part of the patch, and I'll try to
> > boot test the rest of the patch this week.
> 
> Yeah, it's probably fine to just drop it for now, since it has fairly 
> small cleanup impact on cris.
> 
> However, just dropping that hunk is not going to work -- you'll need to 
> re-add the .data.init_task hunk below (which had been part of 
> RW_DATA_SECTION).

Yes, sorry, I did that, but didn't mention it.
Or rather, I added: INIT_TASK_DATA_SECTION(PAGE_SIZE) instead.

> 	-Tim Abbott
> 
> > >  	__edata = . ;			/* End of data section. */
> > >  	_edata = . ;
> > >  
> > > -	. = ALIGN(PAGE_SIZE);	/* init_task and stack, must be aligned. */
> > > -	.data.init_task : { *(.data.init_task) }
> > > -
> > >  	. = ALIGN(PAGE_SIZE);		/* Init code and data. */
> > >  	__init_begin = .;

/^JN - Jesper Nilsson
-- 
               Jesper Nilsson -- jesper.nilsson@...s.com
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