linux-kernel - [PATCH rcu 06/11] rcu/nocb: Remove halfway (de-)offloading handling from bypass

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Message-Id: <20240816045608.30564-7-neeraj.upadhyay@kernel.org>
Date: Fri, 16 Aug 2024 10:26:03 +0530
From: neeraj.upadhyay@...nel.org
To: rcu@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	kernel-team@...a.com,
	rostedt@...dmis.org,
	paulmck@...nel.org,
	neeraj.upadhyay@...nel.org,
	neeraj.upadhyay@....com,
	boqun.feng@...il.com,
	joel@...lfernandes.org,
	urezki@...il.com,
	frederic@...nel.org
Subject: [PATCH rcu 06/11] rcu/nocb: Remove halfway (de-)offloading handling from bypass

From: Frederic Weisbecker <frederic@...nel.org>

Bypass enqueue can't happen anymore in the middle of (de-)offloading
since this sort of transition now only applies to offline CPUs.

The related safety check can therefore be removed.

Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
Reviewed-by: Paul E. McKenney <paulmck@...nel.org>
Signed-off-by: Neeraj Upadhyay <neeraj.upadhyay@...nel.org>
---
 kernel/rcu/tree_nocb.h | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/kernel/rcu/tree_nocb.h b/kernel/rcu/tree_nocb.h
index 8e766396df3a..af44e75eb0cd 100644
--- a/kernel/rcu/tree_nocb.h
+++ b/kernel/rcu/tree_nocb.h
@@ -409,14 +409,6 @@ static bool rcu_nocb_try_bypass(struct rcu_data *rdp, struct rcu_head *rhp,
 		return false;
 	}
 
-	// In the process of (de-)offloading: no bypassing, but
-	// locking.
-	if (!rcu_segcblist_completely_offloaded(&rdp->cblist)) {
-		rcu_nocb_lock(rdp);
-		*was_alldone = !rcu_segcblist_pend_cbs(&rdp->cblist);
-		return false; /* Not offloaded, no bypassing. */
-	}
-
 	// Don't use ->nocb_bypass during early boot.
 	if (rcu_scheduler_active != RCU_SCHEDULER_RUNNING) {
 		rcu_nocb_lock(rdp);
-- 
2.40.1