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

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Date:	Tue, 16 Jun 2015 22:37:14 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	"H. Peter Anvin" <hpa@...or.com>
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 Tue, 2015-06-16 at 13:05 -0700, H. Peter Anvin wrote:
> 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

I have no idea what AS_AVX2 means, sorry. So what would it mean if
someone has a .config with
    CONFIG_AS_AVX2=foo

Ie, what would happen if someone using a toolchain for which that would
not be possible tries to build a kernel with that symbol set? That
person's .config would end up containing
    # CONFIG_AS_AVX2 is not set

or similar, right? 


Paul Bolle

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