From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: akpm@linux-foundation.org, Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org,
Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>,
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 21:59:13 +0100 [thread overview]
Message-ID: <20090422215913.67c1298e@lxorguk.ukuu.org.uk> (raw)
In-Reply-To: <20090422202453.829846363@polymtl.ca>
> There is no official AMD bug ID yet, but it seems to be reported in the field
> and a fix is present in Solaris code base. The following links shows the current
> understanding of the issue.
I would like to know why there isn't an official vendor Bug ID yet
because without that nobody knows what the fix actually is or when it is
needed. It's also not going to help much given the user space problem
(and mixed kernel/user stuff like futexes).
Second point - it needs to be possible to avoid compiling this stuff in
the first place. I don't see where you arrange CMPXCHNG_LFENCE to come
out as blank when people compile for processors without the bug ?
next prev parent reply other threads:[~2009-04-22 21:00 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 [this message]
2009-04-22 22:47 ` Mathieu Desnoyers
2009-04-22 22:53 ` Alan Cox
2009-04-22 23:26 ` Mathieu Desnoyers
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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