linux-kernel - Re: [BUG] msr-trace.h:42 suspicious rcu_dereference

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Message-Id: <20161121110005.GP3612@linux.vnet.ibm.com>
Date:   Mon, 21 Nov 2016 03:00:05 -0800
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Jiri Olsa <jolsa@...hat.com>, Steven Rostedt <rostedt@...dmis.org>,
        linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Josh Triplett <josh@...htriplett.org>,
        Andi Kleen <andi@...stfloor.org>,
        Jan Stancek <jstancek@...hat.com>
Subject: Re: [BUG] msr-trace.h:42 suspicious rcu_dereference_check() usage!

On Mon, Nov 21, 2016 at 10:43:21AM +0100, Peter Zijlstra wrote:
> On Mon, Nov 21, 2016 at 01:02:25AM -0800, Paul E. McKenney wrote:
> > On Mon, Nov 21, 2016 at 01:53:43AM +0100, Jiri Olsa wrote:
> > > 
> > > it got away with attached change.. but this rcu logic
> > > is far beyond me, so it's just wild guess.. ;-)
> > 
> > If in idle, the _rcuidle() is needed, so:
> 
> Well, the point is, only this one rdmsr users is in idle, all the others
> are not, so we should not be annotating _all_ of them, should we?

Fair enough!

							Thanx, Paul