rcu/nocb: Remove superfluous memory barrier after bypass enqueue

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Pre-GP accesses performed by the update side must be ordered against
post-GP accesses performed by the readers. This is ensured by the
bypass or nocb locking on enqueue time, followed by the fully ordered
rnp locking initiated while callbacks are accelerated, and then
propagated throughout the whole GP lifecyle associated with the
callbacks.

Therefore the explicit barrier advertizing ordering between bypass
enqueue and rcuo wakeup is superfluous. If anything, it would even only
order the first bypass callback enqueue against the rcuo wakeup and
ignore all the subsequent ones.

Remove the needless barrier.

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Neeraj Upadhyay <neeraj.upadhyay@kernel.org>

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Frederic Weisbecker 2024-08-14 00:56:42 +02:00 • committed by Neeraj Upadhyay

parent 1b022b8763

commit 7562eed272

1 changed files with 1 additions and 1 deletions

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kernel/rcu/tree_nocb.h

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