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

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Date:	Sun, 22 Jul 2007 07:02:13 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Chris Wright <chrisw@...s-sol.org>,
	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>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [RFC, Announce] Unified x86 architecture, arch/x86

On Sun, Jul 22, 2007 at 09:50:46AM +0200, Thomas Gleixner wrote:
> On Sat, 2007-07-21 at 16:51 -0700, Chris Wright wrote:
> > * Matt Mackall (mpm@...enic.com) wrote:
> > > 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?
> > 
> > It's mostly about file movement first.
> > 
> >  918 files changed, 4745 insertions(+), 2836 deletions(-)
> 
> Hmm, did you forget to make distclean ?
> 
> Numbers from the script:
> 
> include/asm-i386     240 files
> include/asm-x86_64   169 files
> ------------------------------
>                      409 files
> 
> include/asm-x86      389 files
> 
> arch/i386            335 files
> arch/x86_64          141 files
> ------------------------------
>                      476 files
> 
> arch/x86             484 files
> 
> The increase here is due to migration helper files which only include
> the (_32.x or the _64.x) variant.
> 
> Makefile helpers       9 files
> Kconfig helpers        1 file
> Source helpers         4 files
> ------------------------------
>                       14 files
> 
> Summary:
> vanilla            22657 files
> vanilla->x86       22649 files
> 
> ------------------------------
> 
> include/x86 has 125 _32 and 125 _64 files
> arch/x86 has     55 _32 and  55 _64 files
> 
> 25 files were auto-merged
> 
> Looking at include/asm-x86/*_[32/64].h there are offhand ~ 50 of the 125
> which differ only minimal (white space damage, comment changes, ...),
> where the unification is a no brainer.

That looks more promising than I would have expected. For what it's
worth, I was originally fairly disgusted by the _32/64.c thing, but
the idea grows on me.

-- 
Mathematics is the supreme nostalgia of our time.
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