linux-kernel - [PATCH 08/34] rcu: Remove now-empty RCU Tasks Trace functions and calls to them

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Message-Id: <20250923142036.112290-8-paulmck@kernel.org>
Date: Tue, 23 Sep 2025 07:20:10 -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 08/34] rcu: Remove now-empty RCU Tasks Trace functions and calls to them

This commit removes the now-empty functions rcu_tasks_trace_qs_blkd(),
exit_tasks_rcu_finish_trace(), and rcu_spawn_tasks_trace_kthread(),
along with all calls to them.

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.h |  1 -
 kernel/rcu/tasks.h       | 28 +---------------------------
 2 files changed, 1 insertion(+), 28 deletions(-)

diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 879525c5764a0c..7611730e34bc33 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -176,7 +176,6 @@ void rcu_tasks_torture_stats_print(char *tt, char *tf);
 # endif
 
 # ifdef CONFIG_TASKS_TRACE_RCU
-void rcu_tasks_trace_qs_blkd(struct task_struct *t);
 void rcu_tasks_trace_torture_stats_print(char *tt, char *tf);
 # endif
 
diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h
index 967c43b1937bae..25dc49ebad251d 100644
--- a/kernel/rcu/tasks.h
+++ b/kernel/rcu/tasks.h
@@ -800,8 +800,6 @@ static void rcu_tasks_torture_stats_print_generic(struct rcu_tasks *rtp, char *t
 
 #endif // #ifndef CONFIG_TINY_RCU
 
-static void exit_tasks_rcu_finish_trace(struct task_struct *t);
-
 #if defined(CONFIG_TASKS_RCU)
 
 ////////////////////////////////////////////////////////////////////////
@@ -1321,13 +1319,11 @@ void exit_tasks_rcu_finish(void)
 	raw_spin_lock_irqsave_rcu_node(rtpcp, flags);
 	list_del_init(&t->rcu_tasks_exit_list);
 	raw_spin_unlock_irqrestore_rcu_node(rtpcp, flags);
-
-	exit_tasks_rcu_finish_trace(t);
 }
 
 #else /* #ifdef CONFIG_TASKS_RCU */
 void exit_tasks_rcu_start(void) { }
-void exit_tasks_rcu_finish(void) { exit_tasks_rcu_finish_trace(current); }
+void exit_tasks_rcu_finish(void) { }
 #endif /* #else #ifdef CONFIG_TASKS_RCU */
 
 #ifdef CONFIG_TASKS_RUDE_RCU
@@ -1471,12 +1467,6 @@ void __init rcu_tasks_trace_suppress_unused(void)
 	rcu_tasks_torture_stats_print_generic(NULL, NULL, NULL, NULL);
 }
 
-/* Add a newly blocked reader task to its CPU's list. */
-void rcu_tasks_trace_qs_blkd(struct task_struct *t)
-{
-}
-EXPORT_SYMBOL_GPL(rcu_tasks_trace_qs_blkd);
-
 /* Communicate task state back to the RCU tasks trace stall warning request. */
 struct trc_stall_chk_rdr {
 	int nesting;
@@ -1484,19 +1474,9 @@ struct trc_stall_chk_rdr {
 	u8 needqs;
 };
 
-/* Report any needed quiescent state for this exiting task. */
-static void exit_tasks_rcu_finish_trace(struct task_struct *t)
-{
-}
-
 int rcu_tasks_trace_lazy_ms = -1;
 module_param(rcu_tasks_trace_lazy_ms, int, 0444);
 
-static int __init rcu_spawn_tasks_trace_kthread(void)
-{
-	return 0;
-}
-
 #if !defined(CONFIG_TINY_RCU)
 void show_rcu_tasks_trace_gp_kthread(void)
 {
@@ -1520,8 +1500,6 @@ void rcu_tasks_trace_get_gp_data(int *flags, unsigned long *gp_seq)
 }
 EXPORT_SYMBOL_GPL(rcu_tasks_trace_get_gp_data);
 
-#else /* #ifdef CONFIG_TASKS_TRACE_RCU */
-static void exit_tasks_rcu_finish_trace(struct task_struct *t) { }
 #endif /* #else #ifdef CONFIG_TASKS_TRACE_RCU */
 
 #ifndef CONFIG_TINY_RCU
@@ -1668,10 +1646,6 @@ static int __init rcu_init_tasks_generic(void)
 	rcu_spawn_tasks_rude_kthread();
 #endif
 
-#ifdef CONFIG_TASKS_TRACE_RCU
-	rcu_spawn_tasks_trace_kthread();
-#endif
-
 	// Run the self-tests.
 	rcu_tasks_initiate_self_tests();
 
-- 
2.40.1