Re: [PATCH 5/6] rcu/nocb: Allow empty "rcu_nocbs" kernel parameter

[Yury Norov]

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.  ;-)
> 
> I pulled this one in with the usual wordsmithing.
> 
> 							Thanx, Paul

I think 'rcu_nocbs=,' should work as 'none'. But I admit that it looks
awkward. The following patch adds clear 'none' semantics to the parser.
If you like it, I think you may drop non-documentation part of this
patch.