linux-kernel - Re: um: this_cpu_cmpxchg16b

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Message-Id: <201104122041.11460.richard@nod.at>
Date:	Tue, 12 Apr 2011 20:41:11 +0200
From:	Richard Weinberger <richard@....at>
To:	Christoph Lameter <cl@...ux.com>
Cc:	linux-kernel@...r.kernel.org,
	user-mode-linux-devel@...ts.sourceforge.net, penberg@...nel.org,
	hpa@...or.com
Subject: Re: um: this_cpu_cmpxchg16b_emu

Am Dienstag 12 April 2011, 20:10:37 schrieb Christoph Lameter:
> On Tue, 12 Apr 2011, Richard Weinberger wrote:
> > This patch implements this_cpu_cmpxchg16b_emu() for UML.
> 
> Is this really necessary? Just undefine CONFIG_CMPXCHG_LOCAL for UML and
> the asm code will not be used.

UML includes arch/x86/Kconfig.cpu which defines CONFIG_CMPXCHG_LOCAL automatically.
Just disabling CONFIG_CMPXCHG_LOCAL for UML is IMHO not very nice.
When chpxchg is available also UML should use it...

Thanks,
//richard
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