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

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Message-ID: <4A144C4D.7070205@kernel.org>
Date:	Wed, 20 May 2009 11:30:37 -0700
From:	"H. Peter Anvin" <hpa@...nel.org>
To:	Jaswinder Singh Rajput <jaswinder@...nel.org>
CC:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	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 Singh Rajput wrote:
> 
> I think better I will show with the coding to get the clear picture.
> 
> Currently we are using hardcoded x86_capability as [0], [2], [4], [5].
> 
> Thomas prefer to use constant so may be we can define current system as:
> 
> enum {
> 	CPUID_0000_0001_EDX = 0,	/* 0x00000001 edx */
> 	CPUID_8000_0001_EDX,		/* 0x80000001 edx */
> 	CPUID_8086_0001_EDX,		/* 0x80860001 edx */
> 	CPUID_SOFT_MISC1,		/* Software Misc1 */
> 	CPUID_0000_0001_ECX,		/* 0x00000001 ecx */
> 	CPUID_C000_0001_EDX,		/* 0xC0000001 edx */
> 	CPUID_8000_0001_ECX,		/* 0x80000001 ecx */
> 	CPUID_SOFT_MISC2,		/* Software Misc2 */
> 	CPUID_SOFT_VIRTUAL,		/* Software Virtualization */
> };
> 

This really seems clumsy to me.  We don't refer to the individual words
all that often; and more importantly, I think it'd be hard to get rid of
all the places where the words are referenced.

I do NOT want to renumber them; therein lie madness.

	-hpa
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