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

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Message-ID: <20070314130531.GA27498@one.firstfloor.org>
Date:	Wed, 14 Mar 2007 14:05:31 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Andi Kleen <andi@...stfloor.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

> The thing is others and I (and you) are working on getting paravirt_ops
> working for x86_64.  There's a lot of overlap between i386 and x86_64.
> Right now the i386 is ahead of x86_64 and the code seems to be put more
> in the arch/i386 arch.  So now we are going to introduce a
> new ../../i386 hack to get to a shared paravirt_shared.c(?).  Or do we

What would you like exactly to share?  

> just continue on keeping the x86_64 as a separate entity, with a lot of
> duplicate code?

When it makes sense to share the code it can be shared. That is already
done today. But the existing Makefile mechanisms work fine for that.

Making sense: 
- There is actually a lot of shared code
- The supported hardware is the same (remember x86-64 is only for 
modern x86 hardware, while i386 has a much longer legacy) 
- No ifdefs


-Andi
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