Re: [PATCH RFC fs/namespace] Make kern_unmount() use synchronize_rcu_expedited()

[Paul E. McKenney]

On Wed, Apr 27, 2022 at 12:58:34AM +0200, Christoph Bartoschek wrote:
> > 3. https://lore.kernel.org/lkml/20220218183114.2867528-1-riel@xxxxxxxxxxx/
> >         Refined queue_rcu_work() approach.
> >
> > #1 should work, but the resulting IPIs are not going to make the real-time
> > guys happy.  #2 and #3 have been subject to reasonably heavy testing
> > and did fix a very similar issue to the one that you are reporting,
> > but last I knew there were doubts about the concurrency consequences.
> >
> > Could you please give at least #3 a shot and see if it helps you?
> 
> I have tried #3 and it works well with my testcases as far as I can see it.

Thank you for giving it a try!

Al, are further adjustments needed to make this patch cover all the
corner cases?

							Thanx, Paul