linux-kernel - Re: [PATCH -tip] x86: cpu_debug.c prepare report if files are inappropriate or CPU is not supported

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Message-ID: <20090607102036.GO31286@elte.hu>
Date:	Sun, 7 Jun 2009 12:20:36 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jaswinder Singh Rajput <jaswinder@...nel.org>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -tip] x86: cpu_debug.c prepare report if files are
	inappropriate or CPU is not supported


* Jaswinder Singh Rajput <jaswinder@...nel.org> wrote:

> Hello Ingo,
> 
> On Wed, 2009-04-15 at 12:17 +0200, Ingo Molnar wrote:
> 
> > The main beef i had with your code is that it copies CPU enumeration 
> > over into some local variables (cpu_modelflag, cpu_model) with 
> > redundant encodings and decodings which dont fully work.
> > 
> > Is there anything that your encoding/decoding does that cannot be 
> > done via the standard methods?
> > 
> 
> I removed cpu model info. May be this will create some issues on 
> ancient machine as now it depends on rdmsr_safe_on_cpu() and I 
> hope it will be safe ;-)

rdmsr_safe() should really be safe. (If it isnt then that primitive 
needs fixing, not the code that uses it.)

> Can you please check this patch on ancient and latest machines.
> 
> 
> [PATCH] x86: cpu_debug remove model information to reduce encoding-decoding
> 
> Remove model information, encoding/decoding and reduce bookkeeping.
> 
> Reported-by: Ingo Molnar <mingo@...e.hu>
> Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@...il.com>
> ---
>  arch/x86/include/asm/cpu_debug.h |  101 +---------
>  arch/x86/kernel/cpu/cpu_debug.c  |  417 +++++++++-----------------------------
>  2 files changed, 97 insertions(+), 421 deletions(-)

This actually looks like to be a very nice cleanup as well, as can 
be seen from the massive line count reduction. I'll give it some 
testing.

	Ingo
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