linux-kernel - Re: [PATCH 02/11] x86, fpu: rename xfeature

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Date:	Wed, 26 Aug 2015 09:10:09 -0700
From:	Dave Hansen <dave@...1.net>
To:	Borislav Petkov <bp@...en8.de>
CC:	dave.hansen@...ux.intel.com, mingo@...hat.com, x86@...nel.org,
	fenghua.yu@...el.com, tim.c.chen@...ux.intel.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/11] x86, fpu: rename xfeature_bit

On 08/26/2015 09:06 AM, Borislav Petkov wrote:
>> > -enum xfeature_bit {
>> > -	XSTATE_BIT_FP,
>> > -	XSTATE_BIT_SSE,
>> > -	XSTATE_BIT_YMM,
>> > -	XSTATE_BIT_BNDREGS,
>> > -	XSTATE_BIT_BNDCSR,
>> > -	XSTATE_BIT_OPMASK,
>> > -	XSTATE_BIT_ZMM_Hi256,
>> > -	XSTATE_BIT_Hi16_ZMM,
>> > +enum xfeature_nr {
>> > +	XFEATURE_NR_FP,
>> > +	XFEATURE_NR_SSE,
>> > +	/*
>> > +	 * Values above here are "legacy states".
>> > +	 * Those below are "extended states".
>> > +	 */
>> > +	XFEATURE_NR_YMM,
>> > +	XFEATURE_NR_BNDREGS,
>> > +	XFEATURE_NR_BNDCSR,
>> > +	XFEATURE_NR_OPMASK,
>> > +	XFEATURE_NR_ZMM_Hi256,
>> > +	XFEATURE_NR_Hi16_ZMM,
> Why not simply
> 
> s/NR_//
> 
> ?
> 
> I.e., XFEATURE_FP, XFEATURE_SSE and so on...

I wanted to differentiate them from the

#define XSTATE_FP               (1 << XSTATE_BIT_FP)
#define XSTATE_SSE              (1 << XSTATE_BIT_SSE)

defines below.  Those are really XFEATURE_MASK_...  I think this gets a
lots more clear if you have a pair of #defines like:

	XFEATURE_NR_BNDREGS
	XFEATURE_MASK_BNDREGS

It's pretty obvious what's going on there.  What we have now is

	XSTATE_BIT_BNDREGS
	XSTATE_BNDREGS

which I find much less clear.
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