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

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Message-ID: <4892A719.5090302@snapgear.com>
Date:	Fri, 01 Aug 2008 16:03:05 +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:
> On Wed, Jul 30, 2008 at 04:49:08PM +1000, Greg Ungerer wrote:
>> 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?
> Yes please do so.

The move change can be pulled from:

git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu.git for-linus

If there is no complaints I'll send Linus a pull request in a
couple of days time.

Regards
Greg



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Greg Ungerer  --  Chief Software Dude       EMAIL:     gerg@...pgear.com
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