linux-kernel - Re: [PATCH] rcu/nocb: Add an option to ON/OFF an offloading from RT context

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Message-ID: <20220510142416.GR1790663@paulmck-ThinkPad-P17-Gen-1>
Date:   Tue, 10 May 2022 07:24:16 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Uladzislau Rezki <urezki@...il.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Alison Chaiken <achaiken@...ora.tech>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>, RCU <rcu@...r.kernel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Neeraj Upadhyay <neeraj.iitr10@...il.com>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>
Subject: Re: [PATCH] rcu/nocb: Add an option to ON/OFF an offloading from RT
 context

On Tue, May 10, 2022 at 10:09:46AM -0400, Steven Rostedt wrote:
> On Mon, 9 May 2022 11:39:34 -0700
> "Paul E. McKenney" <paulmck@...nel.org> wrote:
> 
> > This allows your current RCU_NOCB_CPU_CB_BOOST with something like
> > this in place of the "default n":
> > 
> > 	default y if PREEMPT_RT
> > 	default n if !PREEMPT_RT
> 
> BTW, I don't think you need the !PREEMPT_RT, because all configs are
> 'n' by  default. That is:
> 
> 	default y if PREEMPT_RT
> 
> should be good enough.

Good point, thank you!

That said, there is a lot of "default n" in a lot of Kconfig files.
And I am OK making this explicit.  So Uladzislau's choice.  ;-)

							Thanx, Paul