linux-kernel - Re: [PATCH 00/11] rcu: Make rcu_core() safe in PREEMPT

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Date:   Thu, 7 Oct 2021 12:12:27 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     Frederic Weisbecker <frederic@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Uladzislau Rezki <urezki@...il.com>,
        Valentin Schneider <valentin.schneider@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Boqun Feng <boqun.feng@...il.com>,
        Neeraj Upadhyay <neeraju@...eaurora.org>,
        Josh Triplett <josh@...htriplett.org>,
        Joel Fernandes <joel@...lfernandes.org>, rcu@...r.kernel.org
Subject: Re: [PATCH 00/11] rcu: Make rcu_core() safe in PREEMPT_RT with NOCB
 + a few other fixes

On Thu, Oct 07, 2021 at 10:49:20AM +0200, Sebastian Andrzej Siewior wrote:
> On 2021-10-06 08:13:39 [-0700], Paul E. McKenney wrote:
> > On Thu, Sep 30, 2021 at 12:10:01AM +0200, Frederic Weisbecker wrote:
> > > PREEMPT_RT has made rcu_core() preemptible, making it unsafe against
> > > concurrent NOCB (de-)offloading.
> > > 
> > > Thomas suggested to drop the local_lock() based solution and simply
> > > check the offloaded state while context looks safe but that's not
> > > enough. Here is a bit of rework.
> > > 
> > > git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
> > > 	rcu/rt
> > > 
> > > HEAD: aac1c58961446c731f2e989bd822ca1fd2659bad
> > 
> > Many of these look quite good, but any chance of getting an official
> > Tested-by from someone in the -rt community?
> 
> I looked over the series, bootet the series and run a quick rcutorture
> and didn't notice anything.
> 
> Tested-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>

Thank you, Sebastian!!!

							Thanx, Paul