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

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Date:	Wed, 30 Jul 2008 16:49:08 +1000
From:	Greg Ungerer <gerg@...pgear.com>
To:	Sam Ravnborg <sam@...nborg.org>
CC:	linux arch <linux-arch@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: kbuild now support arch/$ARCH/include - time for ARCHs to convert

Hi Sam,

Sam Ravnborg wrote:
> The traditional location of the arch specific Makefiles
> has been at:
> 
> 	include/asm-$ARCH
> 
> But as suggested by several people over time and lately
> by Linus in the following post:
> http://kerneltrap.org/mailarchive/linux-kernel/2008/5/21/1903924
> 
> is is suggested to move the arch specific files under arch/
> and for the header files this is arch/$ARCH/include.
> 
> So I have hacked up support for this in kbuild so
> for the simpler cases a simple move of header files as
> in:
> 	git mv include/asm-$ARCH arch/$ARCH/include/asm
> 
> is enough.
> 
> If Linus will accept it then I think -rc1 is a perfect
> time to do it as people has less stuff pending touching
> the header files that are moved.
> Validation is easy - does the usual configs build?
> 
> For the archs that plays games with symlinks this is a
> splendid opportunity to get rid af these.
> The receipe is simple:
> Use 
> 	KBUILD_CFLAGS += -Iarch/$ARCH/include/$CPU
> 
> to select the CPU and then do a copy of the header files
> like this:
> 
> 	git mv include/asm-$ARCH/$CPU arch/$ARCH/include/$CPU/cpu
> 
> Then the code can continue to use:
> 
> 	#include <cpu/foo.h>
> 
> I already converted sparc to use arch/sparc/include -
> while I merged the header files for sparc and sparc64.
> This change is already upstream.
> 
> And for SH I posted a receipe which you can read here:
> http://lkml.org/lkml/2008/7/28/83
> 
> It is SH specific but anyway pretty generic.
> 
> I am limited in time and resources at the moment but I
> would be glad to help out as time permits should there
> be any questions.

I just tried moving the include/asm-m68knommu directory
to arch/m68knommu/include/asm and it all worked fine.
Clean compile first go :-)  Nice.  (As noted
asm-offsets.h was still generated in incldue/asm-m68knommu
afterwards though).

So what is the status, should I prepare git/patch
for Linus?

Regards
Greg


------------------------------------------------------------------------
Greg Ungerer  --  Chief Software Dude       EMAIL:     gerg@...pgear.com
Secure Computing Corporation                PHONE:       +61 7 3435 2888
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