From: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: akpm@linux-foundation.org, Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org, mark.langsdorf@amd.com,
arekm@maven.pl, "H. Peter Anvin" <hpa@zytor.com>,
Andi Kleen <andi@firstfloor.org>, Avi Kivity <avi@qumranet.com>
Subject: Re: [patch 2/2] x86 amd fix cmpxchg read acquire barrier
Date: Wed, 22 Apr 2009 19:26:36 -0400 [thread overview]
Message-ID: <20090422232636.GB22718@Krystal> (raw)
In-Reply-To: <20090422235358.0e0cc7f3@lxorguk.ukuu.org.uk>
* Alan Cox (alan@lxorguk.ukuu.org.uk) wrote:
> > Good point. I should probably configure this as "nothing" unless
> >
> > #ifdef CONFIG_X86_64
> > #if (defined(CONFIG_GENERIC_CPU) || defined(CONFIG_MK8))
> > ...
> > #endif
> > #endif
>
> Is the erratum only present in 64bit mode ?
>
Hrm, from the info I gathered in the web pages linked in the patch
header (refering to Google and Solaris), nothing said it was limited to
64bit mode. You are right.
> Really this needs someone with knowledge of the erratum to characterise
> it accurately and the workarounds.
Yep, but all I can hear from AMD so far is... *crickets*
The last revision of their errata I can find has been updated in
February 2008, and does not talk about this issue.
http://support.amd.com/us/Processor_TechDocs/25759.pdf
Thanks,
Mathieu
--
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
next prev parent reply other threads:[~2009-04-22 23:26 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-22 20:18 [patch 0/2] Fixing AMD cmpxchg "missing lfence" mess Mathieu Desnoyers
2009-04-22 20:18 ` [patch 1/2] x86: cleanup alternative.h Mathieu Desnoyers
2009-04-28 13:05 ` [GIT PULL] " Mathieu Desnoyers
2009-04-28 14:58 ` Ingo Molnar
2009-04-28 15:13 ` [GIT PULL] x86: cleanup alternative.h (v2) Mathieu Desnoyers
2009-04-29 6:17 ` [tip:x86/asm] x86: clean up alternative.h tip-bot for Mathieu Desnoyers
2009-04-29 6:22 ` Mathieu Desnoyers
2009-04-28 17:40 ` [GIT PULL] x86: cleanup alternative.h H. Peter Anvin
2009-04-28 18:11 ` Mathieu Desnoyers
2009-04-28 18:13 ` [GIT PULL] x86: cleanup alternative.h (v3) Mathieu Desnoyers
2009-04-22 20:18 ` [patch 2/2] x86 amd fix cmpxchg read acquire barrier Mathieu Desnoyers
2009-04-22 20:59 ` Alan Cox
2009-04-22 22:47 ` Mathieu Desnoyers
2009-04-22 22:53 ` Alan Cox
2009-04-22 23:26 ` Mathieu Desnoyers [this message]
2009-04-23 8:06 ` Ingo Molnar
2009-04-23 13:19 ` Mathieu Desnoyers
2009-04-23 13:41 ` Arkadiusz Miskiewicz
2009-04-23 22:17 ` Mathieu Desnoyers
2009-04-25 8:19 ` Pavel Machek
2009-05-02 15:55 ` Mathieu Desnoyers
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