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

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Message-ID: <5580819F.1080802@zytor.com>
Date:	Tue, 16 Jun 2015 13:05:51 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Paul Bolle <pebolle@...cali.nl>
CC:	NeilBrown <neilb@...e.de>, 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 06/16/2015 12:56 PM, Paul Bolle wrote:
> On Tue, 2015-06-16 at 12:46 -0700, H. Peter Anvin wrote:
>> There is a hope/intent that eventually the config system will be able to
>> incorporate toolchain dependencies for a bunch of reasons.
> 
> This restarts a four months old thread with a one sentence remark. So
> could you please elaborate, because now you've left me and, perhaps, the
> other people reading this wondering what "toolchain dependencies"
> actually means and what those "bunch of reasons" are.
> 

Sorry, missed the date on this in my inbox for some reason.

So this related to the CONFIG_AS_ symbols for assembly.  We really would
like to do things like actually adding dependencies on assembler or
compiler support into Kconfig proper, rather than having two independent
mechanisms.  That way we could do, for example:

config RAID6_AVX2
	depends on X86 && AS_AVX2


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