Re: [PATCH 1/8] rcu/exp: Remove full barrier upon main thread wakeup

Frederic Weisbecker
2024-01-30T15:48:44Z

Le Tue, Jan 30, 2024 at 04:47:16PM +0100, Frederic Weisbecker a écrit :
> Le Mon, Jan 29, 2024 at 03:23:39PM -0800, Boqun Feng a écrit :
> > From: Frederic Weisbecker <frederic@kernel.org>
> >
> > When an expedited grace period is ending, care must be taken so that all
> > the quiescent states propagated up to the root are correctly ordered
> > against the wake up of the main expedited grace period workqueue.
> >
> > This ordering is already carried through the root rnp locking augmented
> > by an smp_mb__after_unlock_lock() barrier.
> >
> > Therefore the explicit smp_mb() placed before the wake up is not needed
> > and can be removed.
> >
> > Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
> > Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
>
> [Offlist]

And yes that was not offlist, my fingers betrayed me!

>
> For further posting, don't forget to add your own SoB while posting patches :-)
>
> Thanks!
>