linux-kernel - Re: [PATCH] Linux Kernel Markers

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Date:	20 Sep 2006 13:50:53 +0200
From:	Andi Kleen <ak@...e.de>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	prasanna@...ibm.com, Andrew Morton <akpm@...l.org>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Christoph Hellwig <hch@...radead.org>,
	Jes Sorensen <jes@....com>, Paul Mundt <lethal@...ux-sh.org>,
	linux-kernel <linux-kernel@...r.kernel.org>, ltt-dev@...fik.org,
	Martin Bligh <mbligh@...gle.com>,
	Michel Dagenais <michel.dagenais@...ymtl.ca>,
	Ingo Molnar <mingo@...e.hu>, systemtap@...rces.redhat.com,
	systemtap-owner@...rceware.org,
	Thomas Gleixner <tglx@...utronix.de>,
	William Cohen <wcohen@...hat.com>,
	Tom Zanussi <zanussi@...ibm.com>
Subject: Re: [PATCH] Linux Kernel Markers

Alan Cox <alan@...rguk.ukuu.org.uk> writes:

> Ar Mer, 2006-09-20 am 09:18 +0100, ysgrifennodd Richard J Moore:
> > > Are you referring to Intel erratum "unsynchronized cross-modifying code"
> > > - where it refers to the practice of modifying code on one processor
> > > where another has prefetched the unmodified version of the code.
> 
> > In the special case of replacing an opcode with int3 that erratum doesn't
> > apply. I know that's not in the manuals but it has been confirmed by the
> > Intel microarchitecture group. And it's not reasonable to it to be any
> > other way.
> 
> Ok thats cool to know and I wish they'd documented it. Is the same true
> for AMD ?

It pretty much has to, otherwise lots of debuggers would be unhappy

-Andi
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