linux-kernel - Re: [PATCH] x86/raid6: correctly check for assembler capabilities

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Message-ID: <55807D28.7090702@zytor.com>
Date:	Tue, 16 Jun 2015 12:46:48 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Paul Bolle <pebolle@...cali.nl>, NeilBrown <neilb@...e.de>
CC:	Jan Beulich <JBeulich@...e.com>,
	Valentin Rothberg <valentinrothberg@...il.com>, mingo@...e.hu,
	tglx@...utronix.de, james.t.kukunas@...ux.intel.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/raid6: correctly check for assembler capabilities

On 02/03/2015 01:03 PM, Paul Bolle wrote:
> On Wed, 2015-02-04 at 07:50 +1100, NeilBrown wrote:
>> Actually the prefix of this macro is "CONFIG_AS_", not "CONFIG_" :-)
>> CONFIG_AS_ is reserved for assembly magic, and is never used by the the
>> kconfig system.
>>
>> (Well..... I might have made bits of that up, but "git grep 'config AS_'"
>> doesn't find anything).
> 
> That's correct, there are no Kconfig symbols starting with AS_. But
> still, I would like to hear whether there's a reasonable chance I might
> convince other people to adopt my peeve.
> 
> The thinking behind that peeve is, basically, that where people
> encounter a CONFIG_* macro they should only have to check the .config
> file to see how that macro was evaluated in the build that was used.
> 

There is a hope/intent that eventually the config system will be able to
incorporate toolchain dependencies for a bunch of reasons.

	-hpa


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