linux-kernel - Re: [PATCH 00/18] Make common x86 arch area for i386 and x86_64

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Date:	Wed, 14 Mar 2007 19:40:05 +0100
From:	Adrian Bunk <bunk@...sta.de>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Chris Wright <chrisw@...s-sol.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Glauber de Oliveira Costa <glommer@...il.com>
Subject: Re: [PATCH 00/18] Make common x86 arch area for i386 and x86_64 - Take 2

On Wed, Mar 14, 2007 at 11:36:08AM +0100, Andi Kleen wrote:
> Steven Rostedt <rostedt@...dmis.org> writes:
> > 
> > So I spent last night hacking up something to try to make a common ground
> > for all code that is shared between x86_64 and i386.  I called this
> > 
> >    arch/x86
> 
> NACK. I think the current ways work just fine. 

In my experience, the current situation is a pain in the ass.

There are at least 3 different ways how arch/x86_64/ uses arch/i386/ 
code [1], and at least 2 different ways how arch/i386/ uses arch/x86_64/

So whenever you touch one file in arch/i386/ or arch/x86_64/, there are 
5 different ways how this code could be used from the other architecture.

I'd even suggest the following:
- move all files under arch/x86_64/ that are also used under arch/i386/
  to arch/i386/ and then
- mv arch/x86_64 arch/i386/mach-x86_64

The associated Makefile and Kconfig changes shouldn't be a problem, and 
after this it will become much easier to see where code gets used.

> -Andi

cu
Adrian

[1] Steven forgot in his list the fifth one:

      obj-$(CONFIG_MTRR)              += ../../i386/kernel/cpu/mtrr/

    The problem with this variant is that different from the
    other 4 ways, grep'ing for a filename doesn't find it...

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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