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

Frederic Weisbecker
2024-01-30T15:47:19Z

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>

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

Thanks!