linux-kernel - [PATCH 09/34] rcu: Remove unused rcu_tasks_trace_lazy_ms and trc_stall_chk

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Message-Id: <20250923142036.112290-9-paulmck@kernel.org>
Date: Tue, 23 Sep 2025 07:20:11 -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 09/34] rcu: Remove unused rcu_tasks_trace_lazy_ms and trc_stall_chk_rdr struct

The rcupdate.rcu_tasks_trace_lazy_ms and trc_stall_chk_rdr structure
are no longer used, so this commit removes 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>
---
 Documentation/admin-guide/kernel-parameters.txt |  8 --------
 kernel/rcu/tasks.h                              | 10 ----------
 2 files changed, 18 deletions(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 747a55abf4946b..54d31a5e46e1cf 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -6128,14 +6128,6 @@
 			of zero will disable batching.	Batching is
 			always disabled for synchronize_rcu_tasks().
 
-	rcupdate.rcu_tasks_trace_lazy_ms= [KNL]
-			Set timeout in milliseconds RCU Tasks
-			Trace asynchronous callback batching for
-			call_rcu_tasks_trace().  A negative value
-			will take the default.	A value of zero will
-			disable batching.  Batching is always disabled
-			for synchronize_rcu_tasks_trace().
-
 	rcupdate.rcu_self_test= [KNL]
 			Run the RCU early boot self tests
 
diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h
index 25dc49ebad251d..50f5c483e0e15a 100644
--- a/kernel/rcu/tasks.h
+++ b/kernel/rcu/tasks.h
@@ -1467,16 +1467,6 @@ void __init rcu_tasks_trace_suppress_unused(void)
 	rcu_tasks_torture_stats_print_generic(NULL, NULL, NULL, NULL);
 }
 
-/* Communicate task state back to the RCU tasks trace stall warning request. */
-struct trc_stall_chk_rdr {
-	int nesting;
-	int ipi_to_cpu;
-	u8 needqs;
-};
-
-int rcu_tasks_trace_lazy_ms = -1;
-module_param(rcu_tasks_trace_lazy_ms, int, 0444);
-
 #if !defined(CONFIG_TINY_RCU)
 void show_rcu_tasks_trace_gp_kthread(void)
 {
-- 
2.40.1