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

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Date:	Sat, 21 Jul 2007 17:25:09 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...l.org>, Andi Kleen <ak@...e.de>,
	Ingo Molnar <mingo@...e.hu>,
	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

On Sat, Jul 21, 2007 at 12:32:59AM +0200, Thomas Gleixner wrote:
> How is the new arch/x86 and include/asm-x86 namespace layed out? Our 
> foremost concern was to enable a 100% smooth transition to the new, 
> shared architecture, while still enabling much more fine-grained future 
> unification of the source code. To do this we consciously aimed for the 
> strictest possible unification strategy: we only 'unified' those source 
> files that are already bit for bit equal between the two architectures 
> today. For all other files we used the following rule: if a file came 
> from arch/i386/foo/bar.c, it gets moved to arch/x86/foo/bar_32.c, if it 
> came from arch/x86_64/foo/bar.c it gets moved to arch/x86/foo/bar_64.c. 
> We also generated arch/x86/foo/bar.c that simply #include's those two 
> files (depending on whether we do a 32-bit or a 64-bit built). If a file 
> only existed in only one of the architectures, it's moved to 
> arch/x86/foo/bar.c straight away. (take a look at our git repository to 
> see how this works out in practice.)

Can we see some stats on:

How many files were auto-merged?
How many files got 32.c and 64.c extensions?
How many existed only in one arch?

-- 
Mathematics is the supreme nostalgia of our time.
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