linux-kernel - Re: [PATCH] vt: add an event interface

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Date:	Fri, 3 Jul 2009 18:42:25 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] vt: add an event interface


* Alan Cox <alan@...rguk.ukuu.org.uk> wrote:

> A good example of what happens if you don't is
> 
> scripts/checkpatch.pl --file arch/x86/kernel/cpu/mtrr/*c
> 
> where the core part of the code isn't changed very much even 
> though the interfaces completely get reworked. Thus it never gets 
> cleaned up and reviewed as a whole. The code works, will probably 
> work for years but never gets looked at as a whole and tidied.

I think even the MTRR code (which is indeed one of the few x86 
places still not fully cleaned up) supports my arguments.

Look at the averages:

                                      errors   lines of code   errors/KLOC
arch/x86/kernel/cpu/mtrr/amd.c             2             120          16.6
arch/x86/kernel/cpu/mtrr/centaur.c         8             225          35.5
arch/x86/kernel/cpu/mtrr/cleanup.c         0            1102             0
arch/x86/kernel/cpu/mtrr/cyrix.c          10             275          36.3
arch/x86/kernel/cpu/mtrr/generic.c        16             730          21.9
arch/x86/kernel/cpu/mtrr/if.c             11             428          25.7
arch/x86/kernel/cpu/mtrr/main.c           50             751          66.5
arch/x86/kernel/cpu/mtrr/state.c           0              83             0

The arch/x86/kernel/cpu/mtrr/cleanup.c file is a new bit and 
relatively clean.

	Ingo
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