linux-kernel - [PATCH 11/34] rcu: Remove now-empty rcu_tasks_trace_get_gp

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Message-Id: <20250923142036.112290-11-paulmck@kernel.org>
Date: Tue, 23 Sep 2025 07:20:13 -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>,
	Andrii Nakryiko <andrii@...nel.org>,
	Alexei Starovoitov <ast@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	bpf@...r.kernel.org
Subject: [PATCH 11/34] rcu: Remove now-empty rcu_tasks_trace_get_gp_data() function

The rcu_tasks_trace_get_gp_data() is used by rcutorture to diagnose
bugs involving the RCU Tasks Trace grace-period kthread, which now no
longer exists.  This commit therefore removes this function.

Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
Cc: Andrii Nakryiko <andrii@...nel.org>
Cc: Alexei Starovoitov <ast@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: <bpf@...r.kernel.org>
---
 include/linux/rcupdate_trace.h | 1 -
 kernel/rcu/rcu.h               | 4 ----
 kernel/rcu/rcutorture.c        | 1 -
 kernel/rcu/tasks.h             | 5 -----
 4 files changed, 11 deletions(-)

diff --git a/include/linux/rcupdate_trace.h b/include/linux/rcupdate_trace.h
index 3f46cbe6700038..ffd4dcd6339ae4 100644
--- a/include/linux/rcupdate_trace.h
+++ b/include/linux/rcupdate_trace.h
@@ -136,7 +136,6 @@ static inline void rcu_barrier_tasks_trace(void)
 }
 
 // Placeholders to enable stepwise transition.
-void rcu_tasks_trace_get_gp_data(int *flags, unsigned long *gp_seq);
 void __init rcu_tasks_trace_suppress_unused(void);
 struct task_struct *get_rcu_tasks_trace_gp_kthread(void);
 
diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h
index b397572b4a5331..dc5d614b372c1e 100644
--- a/kernel/rcu/rcu.h
+++ b/kernel/rcu/rcu.h
@@ -544,10 +544,6 @@ struct task_struct *get_rcu_tasks_rude_gp_kthread(void);
 void rcu_tasks_rude_get_gp_data(int *flags, unsigned long *gp_seq);
 #endif // # ifdef CONFIG_TASKS_RUDE_RCU
 
-#ifdef CONFIG_TASKS_TRACE_RCU
-void rcu_tasks_trace_get_gp_data(int *flags, unsigned long *gp_seq);
-#endif
-
 #ifdef CONFIG_TASKS_RCU_GENERIC
 void tasks_cblist_init_generic(void);
 #else /* #ifdef CONFIG_TASKS_RCU_GENERIC */
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 5120e1ce811413..485fa822b6a753 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -1130,7 +1130,6 @@ static struct rcu_torture_ops tasks_tracing_ops = {
 	.exp_sync	= synchronize_rcu_tasks_trace,
 	.call		= call_rcu_tasks_trace,
 	.cb_barrier	= rcu_barrier_tasks_trace,
-	.get_gp_data    = rcu_tasks_trace_get_gp_data,
 	.cbflood_max	= 50000,
 	.irq_capable	= 1,
 	.slow_gps	= 1,
diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h
index 6e2530fe23e620..7a8c1fd9addb7a 100644
--- a/kernel/rcu/tasks.h
+++ b/kernel/rcu/tasks.h
@@ -1480,11 +1480,6 @@ struct task_struct *get_rcu_tasks_trace_gp_kthread(void)
 }
 EXPORT_SYMBOL_GPL(get_rcu_tasks_trace_gp_kthread);
 
-void rcu_tasks_trace_get_gp_data(int *flags, unsigned long *gp_seq)
-{
-}
-EXPORT_SYMBOL_GPL(rcu_tasks_trace_get_gp_data);
-
 #endif /* #else #ifdef CONFIG_TASKS_TRACE_RCU */
 
 #ifndef CONFIG_TINY_RCU
-- 
2.40.1