linux-kernel - [PATCH 07/34] rcu: Remove ->trc_reader_special from task

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Message-Id: <20250923142036.112290-7-paulmck@kernel.org>
Date: Tue, 23 Sep 2025 07:20:09 -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 07/34] rcu: Remove ->trc_reader_special from task_struct

Now that RCU Tasks Trace has been re-implemented in terms of SRCU-fast,
and no-longer-needed quiescent-state functions have been removed, the
->trc_reader_special task_struct field is only initialized, and never
actually used.  This commit therefore removes it.

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/sched.h | 1 -
 init/init_task.c      | 1 -
 kernel/fork.c         | 1 -
 3 files changed, 3 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index e62c99e44a5502..577fafd22a0e6f 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -940,7 +940,6 @@ struct task_struct {
 #ifdef CONFIG_TASKS_TRACE_RCU
 	int				trc_reader_nesting;
 	struct srcu_ctr __percpu	*trc_reader_scp;
-	union rcu_special		trc_reader_special;
 #endif /* #ifdef CONFIG_TASKS_TRACE_RCU */
 
 	struct sched_info		sched_info;
diff --git a/init/init_task.c b/init/init_task.c
index 91c37f66ec8e9a..0c075f3cc8fc5a 100644
--- a/init/init_task.c
+++ b/init/init_task.c
@@ -165,7 +165,6 @@ struct task_struct init_task __aligned(L1_CACHE_BYTES) = {
 #endif
 #ifdef CONFIG_TASKS_TRACE_RCU
 	.trc_reader_nesting = 0,
-	.trc_reader_special.s = 0,
 #endif
 #ifdef CONFIG_CPUSETS
 	.mems_allowed_seq = SEQCNT_SPINLOCK_ZERO(init_task.mems_allowed_seq,
diff --git a/kernel/fork.c b/kernel/fork.c
index 12388e895d2955..5686d50b62cfaf 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1780,7 +1780,6 @@ static inline void rcu_copy_process(struct task_struct *p)
 #endif /* #ifdef CONFIG_TASKS_RCU */
 #ifdef CONFIG_TASKS_TRACE_RCU
 	p->trc_reader_nesting = 0;
-	p->trc_reader_special.s = 0;
 #endif /* #ifdef CONFIG_TASKS_TRACE_RCU */
 }
 
-- 
2.40.1