linux-kernel - Re: [PATCH 3/10 -tip] x86: Add cpufeatures for Advanced Power Management

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Message-ID: <alpine.LFD.2.00.0905122219420.3561@localhost.localdomain>
Date:	Tue, 12 May 2009 23:04:04 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Jaswinder Singh Rajput <jaswinder@...nel.org>
cc:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...nel.org>,
	Robert Richter <robert.richter@....com>,
	Dave Jones <davej@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	x86 maintainers <x86@...nel.org>
Subject: Re: [PATCH 3/10 -tip] x86: Add cpufeatures for Advanced Power
 Management

Jaswinder,

On Wed, 13 May 2009, Jaswinder Singh Rajput wrote:
> +	/* Advanced Power Management (Function 8000_0007h), edx */
> +	if (c->extended_cpuid_level >= 0x80000007) {
> +		c->x86_capability[9] = cpuid_edx(0x80000007);

In the reply to [Patch 5/10] Ingo wrote:
>> Also, open-coding x86_capability[9] like that is quite unclean. Were 
>> we ever to reorder those bits internally, this could would break.

Do you really believe that open-coding x86_capability[9] in .../common.c
is better than the open-coding in ../powernow-k8.c ?

Again, open-coding is wrong and error prone. Ingo explicitely asked for a
helper function. All you did is moving the open-coded hard wired array
reference to a different place.

Please start to listen to the review comments as long as people are
willing to look at your patches. Seriously, the noise/useful ratio of
your patches is annoying and adds an unjustified burden to the
maintainers of that code.

Thanks,

	tglx
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