linux-kernel - Re: [PATCH rcu 0/18] RCU no-CBs CPU updates for v5.17

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Message-ID: <20211202020347.GB430494@lapt>
Date:   Wed, 1 Dec 2021 18:03:47 -0800
From:   Yury Norov <yury.norov@...il.com>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     rcu@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...com, mingo@...nel.org, jiangshanlai@...il.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
        rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
        fweisbec@...il.com, oleg@...hat.com, joel@...lfernandes.org
Subject: Re: [PATCH rcu 0/18] RCU no-CBs CPU updates for v5.17

On Wed, Dec 01, 2021 at 04:28:48PM -0800, Paul E. McKenney wrote:
> Hello!

...

> 17.	Allow empty "rcu_nocbs" kernel parameter, courtesy of Frederic
> 	Weisbecker.

...

> Note that #17 might be updated given some ongoing work by Yury Norov
> to support "none" for bitmaps, including the cpumask taken by the
> rcu_nocbs kernel-boot parameter.

Hi Paul,

This is the only work that is needed to support 'none':

https://lkml.org/lkml/2021/11/24/2642

>From the last discussion, it's not clear is this 'none' needed or not.
If needed, I'll submit the patch.

Thanks,
Yury