linux-kernel - Re: [PATCH 1/5] perf, x86: Remove incorrect model number from Haswell perf

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Date:	Wed, 27 Aug 2014 20:50:55 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Andi Kleen <andi@...stfloor.org>
cc:	peterz@...radead.org, linux-kernel@...r.kernel.org,
	mingo@...nel.org, eranian@...gle.com,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 1/5] perf, x86: Remove incorrect model number from Haswell
 perf

On Wed, 27 Aug 2014, Andi Kleen wrote:
> On Wed, Aug 27, 2014 at 11:53:57AM +0200, Thomas Gleixner wrote:
> > Try again when you figured yourself out what number means what and why
> > 71 is bogus.
> 
> 71 is definitely not a Haswell, but a Broadwell.

Fine. So the changelog should tell so.
 
> However it was removed from the Broadwell patch based on Peter's
> feedback.
> 
> So technically the patch is not needed right now because there 
> would be no duplicates (unless 71 was readded), so the compiler
> would not complain.

It's very well technically needed simply because its not a haswell and
if it's run on real model 71 hardware we'll get some interesting stuff
to debug.
 
> However it's still incorrect for Haswell, so I maintain removing
> it is the right thing to do.

I did not argue against the removal itself. That's fine and obviously
correct if model 71 is not a haswell. All I want is a proper patch (1
line) and a proper changelog explaining WHY this is the right thing to
do.

Thanks,

	tglx

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