linux-kernel - Re: linux-next: add utrace tree

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Message-ID: <4B6FD9A2.8070008@zytor.com>
Date:	Mon, 08 Feb 2010 01:30:10 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Pavel Machek <pavel@....cz>
CC:	rostedt@...dmis.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Tom Tromey <tromey@...hat.com>,
	Kyle Moffett <kyle@...fetthome.net>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Fr??d??ric Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	linux-next@...r.kernel.org, utrace-devel@...hat.com,
	Thomas Gleixner <tglx@...utronix.de>,
	JimKeniston <jkenisto@...ibm.com>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: linux-next: add utrace tree

On 02/07/2010 10:54 PM, Pavel Machek wrote:
>>
>> No, it has nothing to do with ring.  It has to do with modifying code
>> that another CPU could be executing at the same time, and with modifying
>> code on the same processor through another virtual alias (they are
>> different issues.)  The same issues apply regardless of the CPL of the
>> processor.
>
> ...but these are always 'there could be cpu bugs around' issues,
> right? Like amd k6. AFAICT x86 always supported self-modifying code
> without any extra barriers needed...
>

*Self*-modifying code, yes.  *Cross*-modifying code, no.

	-hpa
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