From: Frederic Weisbecker <frederic@kernel.org>
Date: Thu, 30 May 2024 13:45:47 +0000 (+0200)
Subject: rcu/nocb: Remove halfway (de-)offloading handling from bypass
X-Git-Tag: v6.12-rc1~166^2^2~8
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=d2e7f55ff2e3d878a63149c90b360cbec101a83e;p=thirdparty%2Fkernel%2Flinux.git

rcu/nocb: Remove halfway (de-)offloading handling from bypass

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@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Reviewed-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Neeraj Upadhyay <neeraj.upadhyay@kernel.org>
---

diff --git a/kernel/rcu/tree_nocb.h b/kernel/rcu/tree_nocb.h
index 8e766396df3ad..af44e75eb0cd9 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);