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

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Message-ID: <20090530103111.GA22825@liondog.tnic>
Date:	Sat, 30 May 2009 12:31:11 +0200
From:	Borislav Petkov <petkovbb@...glemail.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Borislav Petkov <petkovbb@...glemail.com>,
	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, May 30, 2009 at 01:40:07AM -0700, Andrew Morton wrote:
> 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.

Right, we can do that too. Stay tuned.

> Is popcnt supported on all CPUs?

All >= Fam10h.

-- 
Regards/Gruss,
    Boris.
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