Date:   Wed, 24 Nov 2021 17:02:22 -0800
From:   "Paul E. McKenney" <paulmck@kernel.org>
To:     Frederic Weisbecker <frederic@kernel.org>
Cc:     LKML <linux-kernel@vger.kernel.org>,
        Uladzislau Rezki <urezki@gmail.com>,
        Neeraj Upadhyay <quic_neeraju@quicinc.com>,
        Boqun Feng <boqun.feng@gmail.com>,
        Josh Triplett <josh@joshtriplett.org>,
        Joel Fernandes <joel@joelfernandes.org>, rcu@vger.kernel.org,
        yury.norov@gmail.com
Subject: Re: [PATCH 5/6] rcu/nocb: Allow empty "rcu_nocbs" kernel parameter
Message-ID: <20211125010222.GX641268@paulmck-ThinkPad-P17-Gen-1>
Reply-To: paulmck@kernel.org
References: <20211123003708.468409-1-frederic@kernel.org>
 <20211123003708.468409-6-frederic@kernel.org>
 <20211125004720.GV641268@paulmck-ThinkPad-P17-Gen-1>
 <20211125005526.GA490855@lothringen>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20211125005526.GA490855@lothringen>
Precedence: bulk

On Thu, Nov 25, 2021 at 01:55:26AM +0100, Frederic Weisbecker wrote:
> On Wed, Nov 24, 2021 at 04:47:20PM -0800, Paul E. McKenney wrote:
> > On Tue, Nov 23, 2021 at 01:37:07AM +0100, Frederic Weisbecker wrote:
> > > If a user wants to boot without any CPU in offloaded mode initially but
> > > with the possibility to offload them later using cpusets, provide a way
> > > to simply pass an empty "rcu_nocbs" kernel parameter which will enforce
> > > the creation of dormant nocb kthreads.
> > 
> > Huh.  This would have been a use for Yury Norov's "none" bitmask
> > specifier.  ;-)
> 
> This must be the last missing piece before we can finally support NR_CPUS=0 ;)

;-) ;-) ;-)

							Thanx, Paul

> > I pulled this one in with the usual wordsmithing.
> 
> Thanks!