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

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Date:	Thu, 15 Mar 2007 08:50:47 -0700
From:	Martin Bligh <mbligh@...igh.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Andi Kleen <andi@...stfloor.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	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

Linus Torvalds wrote:
> 
> On Wed, 14 Mar 2007, Ingo Molnar wrote:
>> and that's how i think unification of architectures should be done: move 
>> code into kernel/* and drivers/*, _not_ into another architecture. That 
>> way all architectures benefit.
> 
> Don't be silly.
> 
> Did you even *look* at the patches?
> 
> We're talking about things like
> 
> 	b/arch/x86/kernel/cpu/cpufreq/powernow-k8.h
> 
> so please tell me what drugs you are on that say that we should move this 
> into kernel/* and drivers/* and make all architectures benefit. It's 
> *x86* specific, it's just that k8 exists both in 32-bit and 64-bit land.
> 
> The file is *already* shared, it's just that right now it is not in a 
> shared location. Right now it is in arch/i386/ (as if it was 
> i386-specific) and then x86-64 includes it with:
> 
> arch/x86_64/kernel/cpufreq/Makefile:
> 
> 	#
> 	# Reuse the i386 cpufreq drivers
> 	#
> 	
> 	SRCDIR := ../../../i386/kernel/cpu/cpufreq
> 
> and anybody who thinks this is "nice" simply has no taste at all.

Can't we move the shared files into a new shared arch/ subdirectory
(ia32_64 or whatever), and have them included from both places?
At least then it's obvious they're shared, and it's a migration
strategy to the shared arch that you want.

On the downside, it's more ../../.. type stuff. On the upside,
they're more cleanly separated and it's apparent what's going on.
Seems nicer to me than drivers/ and kernel/ for stuff that's
really arch specific, but shared between two arches.

M.
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