linux-kernel - Re: [PATCH 0/4] amd64

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Message-ID: <4A24248E.3060005@zytor.com>
Date:	Mon, 01 Jun 2009 11:57:18 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Borislav Petkov <petkovbb@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Borislav Petkov <borislav.petkov@....com>, greg@...ah.com,
	mingo@...e.hu, norsk5@...oo.com, tglx@...utronix.de,
	mchehab@...hat.com, aris@...hat.com, edt@....ca,
	linux-kernel@...r.kernel.org, randy.dunlap@...cle.com,
	Sam Ravnborg <sam@...nborg.org>
Subject: Re: [PATCH 0/4] amd64_edac: misc fixes

Borislav Petkov wrote:
> Actually, popcnt got added to gas in July 2006 so checking the gas
> version should suffice, IMHO.

gas is part of binutils.

> Anyway, I proposed something similar before but Andrew suggested that we
> should simply slap in the opcode so we don't need the Kbuild changes.
> The advantage of the approach is that it works unconditionally on all
> toolchains and introduces less code changes. Hmm...

That really sucks, though, in the long run.  I personally prefer to have
the "right thing" -- which in this case is probably gcc intrinsics --
and then a fallback that will gradually fall out of use.

	-hpa

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