linux-kernel - [PATCH rcu 3/6] rcu: Provide rcu_barrier_cb_is_done() to check rcu

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Message-Id: <20240802003426.4134196-3-paulmck@kernel.org>
Date: Thu,  1 Aug 2024 17:34:23 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: rcu@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	kernel-team@...a.com,
	rostedt@...dmis.org,
	"Paul E. McKenney" <paulmck@...nel.org>
Subject: [PATCH rcu 3/6] rcu: Provide rcu_barrier_cb_is_done() to check rcu_barrier() CBs

This commit provides a rcu_barrier_cb_is_done() function that returns
true if the *rcu_barrier*() callback passed in is done.  This will be
used when printing grace-period debugging information.

Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 kernel/rcu/rcu.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h
index f035fd4e579b4..feb3ac1dc5d59 100644
--- a/kernel/rcu/rcu.h
+++ b/kernel/rcu/rcu.h
@@ -252,6 +252,11 @@ static inline void debug_rcu_head_callback(struct rcu_head *rhp)
 		kmem_dump_obj(rhp);
 }
 
+static inline bool rcu_barrier_cb_is_done(struct rcu_head *rhp)
+{
+	return rhp->next == rhp;
+}
+
 extern int rcu_cpu_stall_suppress_at_boot;
 
 static inline bool rcu_stall_is_suppressed_at_boot(void)
-- 
2.40.1