linux-kernel - [PATCH] rcu/nocb: Check rdp_gp->nocb_timer in __call_rcu_nocb

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Message-Id: <20240117102616.18302-1-qiang.zhang1211@gmail.com>
Date: Wed, 17 Jan 2024 18:26:16 +0800
From: Zqiang <qiang.zhang1211@...il.com>
To: paulmck@...nel.org,
	frederic@...nel.org,
	quic_neeraju@...cinc.com,
	joel@...lfernandes.org
Cc: qiang.zhang1211@...il.com,
	rcu@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] rcu/nocb: Check rdp_gp->nocb_timer in __call_rcu_nocb_wake()

Currently, only rdp_gp->nocb_timer is used, for nocb_timer of
no-rdp_gp structure, the timer_pending() is always return false,
this commit therefore need to check rdp_gp->nocb_timer in
__call_rcu_nocb_wake().

Signed-off-by: Zqiang <qiang.zhang1211@...il.com>
---
 kernel/rcu/tree_nocb.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/rcu/tree_nocb.h b/kernel/rcu/tree_nocb.h
index 54971afc3a9b..3f85577bddd4 100644
--- a/kernel/rcu/tree_nocb.h
+++ b/kernel/rcu/tree_nocb.h
@@ -564,6 +564,7 @@ static void __call_rcu_nocb_wake(struct rcu_data *rdp, bool was_alldone,
 	long lazy_len;
 	long len;
 	struct task_struct *t;
+	struct rcu_data *rdp_gp = rdp->nocb_gp_rdp;
 
 	// If we are being polled or there is no kthread, just leave.
 	t = READ_ONCE(rdp->nocb_gp_kthread);
@@ -608,7 +609,7 @@ static void __call_rcu_nocb_wake(struct rcu_data *rdp, bool was_alldone,
 		smp_mb(); /* Enqueue before timer_pending(). */
 		if ((rdp->nocb_cb_sleep ||
 		     !rcu_segcblist_ready_cbs(&rdp->cblist)) &&
-		    !timer_pending(&rdp->nocb_timer)) {
+		    !timer_pending(&rdp_gp->nocb_timer)) {
 			rcu_nocb_unlock(rdp);
 			wake_nocb_gp_defer(rdp, RCU_NOCB_WAKE_FORCE,
 					   TPS("WakeOvfIsDeferred"));
-- 
2.17.1