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

[Sam Ravnborg <sam@ravnborg.org>]

On Fri, Oct 19, 2007 at 12:00:48AM +0200, Andi Kleen wrote:
> 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.

But then we should fix them instead of working around the problem - no?

Grepping for _text shows that there are plenty of different ways to declare
that symbol extern - this does not look correct.

And I recall that extern char sym[] is considered correct by binutils 
people - but I'm not 100% sure and google did not give me an appropriate hit.

	Sam
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/