linux-kernel - Re: [patch 1/3] Add BSS to resource tree

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Message-ID: <20071018220048.GB3459@bingen.suse.de>
Date:	Fri, 19 Oct 2007 00:00:48 +0200
From:	Andi Kleen <ak@...e.de>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Andi Kleen <ak@...e.de>, Andrew Morton <akpm@...ux-foundation.org>,
	Bernhard Walle <bwalle@...e.de>, linux-kernel@...r.kernel.org,
	kexec@...ts.infradead.org, vgoyal@...ibm.com
Subject: Re: [patch 1/3] Add BSS to resource tree

On Thu, Oct 18, 2007 at 11:58:27PM +0200, Sam Ravnborg wrote:
> On Thu, Oct 18, 2007 at 11:48:37PM +0200, Andi Kleen wrote:
> > > > +extern char _text[], _end[], _etext[], _edata[], _bss[];
> > > 
> > > These should be in a header file.
> > 
> > Normally the "no externs in .c" rule doesn't apply to assembler or linker 
> > script defined labels. That's because the point of the header file is to 
> > type check them, but there is nothing to type check here.
> 
> For linker generated symbols we have sections.h for this purpose.
> The above symbols are all available if we do an:
> #include <asm/sections.h>
> 
> This is the right fix in this case.

The problem is that they're often the wrong type here. E.g. wrong signedness 
etc. I ran into problems in the past where using this required ugly casts.

-Andi
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