linux-kernel - Re: kbuild now support arch/$ARCH/include

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Date:	Fri, 1 Aug 2008 09:35:04 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Paul Mundt <lethal@...ux-sh.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	David Howells <dhowells@...hat.com>,
	Greg Ungerer <gerg@...pgear.com>,
	linux arch <linux-arch@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux/m68k <linux-m68k@...r.kernel.org>,
	uClinux list <uclinux-dev@...inux.org>
Subject: Re: kbuild now support arch/$ARCH/include - time for ARCHs to convert

On Thursday 31 July 2008, Sam Ravnborg wrote:
> > #ifdef __KERNEL__
> > #ifdef CONFIG_MMU
> > #include "${BASE}_mmu.h"
> > #else
> > #include "${BASE}_nommu.h"
> > #endif
> > #else
> > #include "${BASE}_mmu.h"
> > #endif
> > EOF
> > }
> 
> This will leak a CONFIG_ symbol if the header file
> is exported. Can we do it with a gcc defined symbol?
> [See how I did it for sparc for instance]

Is there a compiler defined symbol for this? I thought the tool
chain was identical. Do you think my #ifdef __KERNEL__ does
not do what I wanted it to do? It should make sure that
user space always sees the _mmu variant.

	Arnd <><
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