linux-kernel - Re: [RFC, Announce] Unified x86 architecture, arch/x86

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Date:	Sat, 21 Jul 2007 14:30:32 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Brian Gerst <bgerst@...ntduck.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Andi Kleen <ak@...e.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...l.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Chris Wright <chrisw@...s-sol.org>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [RFC, Announce] Unified x86 architecture, arch/x86

* Brian Gerst <bgerst@...ntduck.org> wrote:

> > And there is more of that, when you take the time and look closely 
> > at the _32.[ch] _64.[ch] files which are created by the merge.
> 
> Looking at the include files, many more are near-identical in trivial 
> ways, such as whitespace, comments, local variable names, or guard 
> #ifdefs.

yeah. And by moving them next to each other, people actually have the 
real incentive to look and ponder: "these two files do similar things 
but they look so different. Does it _have_ to be so?". Often the answer 
is: no, it could really be shared.

And even when things will continue to be different, it's nice to have 
them side by side for documentation purposes as well. "we do this 
differently on 64-bit, because ...".

Key to starting all these cleanups is to create plain and simple 
physical proximity - and our transition arch/x86 and include/asm-x86 
achieves that - nothing more, nothing less.

	Ingo
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