linux-kernel - Re: On trace_*_rcuidle functions in modules

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Message-ID: <20200415225326.GF17661@paulmck-ThinkPad-P72>
Date:   Wed, 15 Apr 2020 15:53:26 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        John Stultz <john.stultz@...aro.org>,
        Josh Triplett <josh@...htriplett.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Saravana Kannan <saravanak@...gle.com>,
        Todd Kjos <tkjos@...gle.com>, Stephen Boyd <sboyd@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: On trace_*_rcuidle functions in modules

On Thu, Apr 16, 2020 at 12:42:14AM +0200, Peter Zijlstra wrote:
> On Wed, Apr 15, 2020 at 03:04:59PM -0700, Paul E. McKenney wrote:
> > 
> > My guess is that invoking rcu_irq_enter() and rcu_irq_exit() around every
> > potential call into module code out of the PM code is a non-starter,
> > but I cannot prove that either way.
> 
> Isn't that exactly what cpu_pm_notify() is doing?

Right you are!  Problem solved, then?

							Thanx, Paul