linux-kernel - Re: [tip:tracing/core] x86/tracing: comment need for atomic nop

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Date:	Sat, 12 Sep 2009 14:05:06 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	linux-kernel@...r.kernel.org, mingo@...hat.com, hpa@...or.com,
	srostedt@...hat.com, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:tracing/core] x86/tracing: comment need for atomic nop

On Sat, 2009-09-12 at 09:45 -0400, Mathieu Desnoyers wrote:
> * tip-bot for Steven Rostedt (srostedt@...hat.com) wrote:
> > Commit-ID:  fc06b8520b3bf9aaeb2e27debe6719c215bd4916
> > Gitweb:     http://git.kernel.org/tip/fc06b8520b3bf9aaeb2e27debe6719c215bd4916
> > Author:     Steven Rostedt <srostedt@...hat.com>
> > AuthorDate: Thu, 10 Sep 2009 17:22:44 -0400
> > Committer:  Steven Rostedt <rostedt@...dmis.org>
> > CommitDate: Thu, 10 Sep 2009 17:22:44 -0400
> > 
> > x86/tracing: comment need for atomic nop
> > 
> > The dynamic function tracer relys on the macro P6_NOP5 always being
> > an atomic NOP. If for some reason it is changed to be two operations
> > (like a nop2 nop3) it can faults within the kernel when the function
> > tracer modifies the code.
> > 
> > This patch adds a comment to note that the P6_NOPs are expected to
> > be atomic. This will hopefully prevent anyone from changing that.
> > 
> > Reported-by: Mathieu Desnoyer <mathieu.desnoyers@...ymtl.ca>
> 
> With an added "s" to my last name, that will be good.

Oops, sorry. I seem to always do that to your name. I was too busy
concentrating in getting your email correct (wrote the commit on a
different box than my email client) that I didn't notice your name was
wrong.

-- Steve

> 
> Thanks !
> 
> Acked-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
> 
> > Signed-off-by: Steven Rostedt <rostedt@...dmis.org>


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