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

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Message-ID: <20100127112055.GA14289@in.ibm.com>
Date:	Wed, 27 Jan 2010 16:50:55 +0530
From:	Ananth N Mavinakayanahalli <ananth@...ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Kyle Moffett <kyle@...fetthome.net>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Fr??d??ric Weisbecker <fweisbec@...il.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Tom Tromey <tromey@...hat.com>,
	"Frank Ch. Eigler" <fche@...hat.com>, linux-next@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>, utrace-devel@...hat.com,
	Thomas Gleixner <tglx@...utronix.de>, avi@...hat.com
Subject: Re: linux-next: add utrace tree

On Wed, Jan 27, 2010 at 12:08:31PM +0100, Peter Zijlstra wrote:
> On Wed, 2010-01-27 at 16:35 +0530, Ananth N Mavinakayanahalli wrote:
> > Probing RIP-relative instructions work just fine; there are fixups that
> > take care of it. 
> 
> Ah my bad then, it was my understanding you simply bailed on those.
> 
> Just for my information, how large are the replacement sequences?

The RIP relative instruction is transformed into indirect addressing
mode using a scratch register.

For details http://marc.info/?l=linux-kernel&m=126401936114639&w=2. 

Ananth
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