On Thu, Nov 25, 2021 at 02:28:53PM +0100, Frederic Weisbecker wrote:

On Wed, Nov 24, 2021 at 08:41:32PM -0800, Yury Norov wrote:

quoted

On Wed, Nov 24, 2021 at 04:47:20PM -0800, Paul E. McKenney wrote:

quoted

On Tue, Nov 23, 2021 at 01:37:07AM +0100, Frederic Weisbecker wrote:

quoted

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.

I don't have real objection, but I fear that "rcu_nocbs=none" might be
interpretated as rcu_nocbs is entirely deactivated, whereas "rcu_nocbs"
alone makes it clear that we are turning something on.

How about "rcu_nocbs=,"?  ;-)

							Thanx, Paul

We can support both though.

Thanks.