linux-kernel - Re: [PATCH 2/3] livepatch/rcu: Warn when system consistency is broken in RCU code

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Date:   Mon, 8 May 2017 14:30:52 -0700
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Petr Mladek <pmladek@...e.com>, Jessica Yu <jeyu@...hat.com>,
        Jiri Kosina <jikos@...nel.org>,
        Miroslav Benes <mbenes@...e.cz>, live-patching@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] livepatch/rcu: Warn when system consistency is
 broken in RCU code

On Mon, May 08, 2017 at 05:18:20PM -0400, Steven Rostedt wrote:
> On Mon, 8 May 2017 14:07:54 -0700
> "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> wrote:
> 
> > Except that, as Steven will quickly point out, this won't work at the
> > very edges of the NMI, when NMI_MASK won't be set in preempt_count().
> 
> I believe those parts of the NMI has "notrace" because it can break
> other parts of ftrace too.

Should be good clean fun to validate that belief.  ;-)

							Thanx, Paul