linux-kernel - Re: [patch 1/2] m68k: runtime patching infrastructure

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Date:	Wed, 30 May 2007 13:19:45 +0200 (CEST)
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Joerg Dorchain <joerg@...chain.net>
Cc:	Eric Dumazet <dada1@...mosbay.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-m68k@...r.kernel.org,
	Roman Zippel <zippel@...ux-m68k.org>
Subject: Re: [patch 1/2] m68k: runtime patching infrastructure

On Wed, 30 May 2007, Joerg Dorchain wrote:
> On Wed, May 30, 2007 at 09:06:08AM +0200, Geert Uytterhoeven wrote:
> [...]
> > > > 
> > > > I think it could be tightened up even if it happens not to warn?
> > > 
> > > 
> > > struct a {
> > > 	struct not_yet_defined *start, *end;
> > > };
> > > 
> > > struct not_yet_defined {
> > > 	void *foo;
> > > };
> > > 
> > > Is a valid and gives no warnings.
> > 
> > I was puzzled by this as well, as there were no compiler warnings...
> 
> Pointers are (at least on m68k) of known size, so the compiler knows how
> much space the struct occupies.
> 
> Type checking is by definition futile with void * pointer, but for all
> other cases the compiler has all types and sizes it needs at this point.
> 
> The actual dereferencing of the symbol table is done by the linker,
> which also knows all locations and sizes it needs.

True.

> Actually, this is the only way to define circular referencing
> structures.

No, you have forward declarations for that. These are missing here.

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds
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