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

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Message-Id: <20090530014007.3c1e22d5.akpm@linux-foundation.org>
Date:	Sat, 30 May 2009 01:40:07 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Borislav Petkov <petkovbb@...glemail.com>
Cc:	Borislav Petkov <borislav.petkov@....com>, greg@...ah.com,
	mingo@...e.hu, norsk5@...oo.com, tglx@...utronix.de, hpa@...or.com,
	mchehab@...hat.com, aris@...hat.com, edt@....ca,
	linux-kernel@...r.kernel.org, randy.dunlap@...cle.com
Subject: Re: [PATCH 0/4] amd64_edac: misc fixes

On Sat, 30 May 2009 10:19:54 +0200 Borislav Petkov <petkovbb@...glemail.com> wrote:

> Also, I've been thinking about how the old(er)
> toolchain problem can be addressed and one fairly doable thing would be
> if I'd query the gas version in the kernel Makefile and define popcnt
> dependent on it and for older assemblers simply slap in the opcode and
> fixate the operands in an inline assembly so that it works.

We've done that before.  BUG() is one case (for other reasons), I think.

But if we have the code in there which uese the literal opcode, there's
no need to query gas or to add the conditional.

Is popcnt supported on all CPUs?
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