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

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Message-ID: <1264618399.31321.470.camel@gandalf.stny.rr.com>
Date:	Wed, 27 Jan 2010 13:53:19 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	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 Wed, 2010-01-27 at 09:42 -0800, H. Peter Anvin wrote:
> On 01/27/2010 05:59 AM, Steven Rostedt wrote:

> > I think the issue was that ring 0 was never meant to do that, where as,
> > ring 3 does it all the time. Doesn't the dynamic library modify its
> > text?
> > 
> 
> 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.

Thanks for clarifying.

-- Steve


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