linux-kernel - [PATCH rcu 05/26] context_tracking, rcu: Rename ct_dynticks_cpu_acquire() into ct_rcu_watching_cpu

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Message-Id: <20240816040241.17776-5-neeraj.upadhyay@kernel.org>
Date: Fri, 16 Aug 2024 09:32:20 +0530
From: neeraj.upadhyay@...nel.org
To: rcu@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	kernel-team@...a.com,
	rostedt@...dmis.org,
	paulmck@...nel.org,
	neeraj.upadhyay@...nel.org,
	neeraj.upadhyay@....com,
	boqun.feng@...il.com,
	joel@...lfernandes.org,
	urezki@...il.com,
	frederic@...nel.org,
	Valentin Schneider <vschneid@...hat.com>
Subject: [PATCH rcu 05/26] context_tracking, rcu: Rename ct_dynticks_cpu_acquire() into ct_rcu_watching_cpu_acquire()

From: Valentin Schneider <vschneid@...hat.com>

The context_tracking.state RCU_DYNTICKS subvariable has been renamed to
RCU_WATCHING, reflect that change in the related helpers.

Signed-off-by: Valentin Schneider <vschneid@...hat.com>
Reviewed-by: Frederic Weisbecker <frederic@...nel.org>
Signed-off-by: Neeraj Upadhyay <neeraj.upadhyay@...nel.org>
---
 .../RCU/Design/Memory-Ordering/Tree-RCU-Memory-Ordering.rst   | 2 +-
 include/linux/context_tracking_state.h                        | 2 +-
 kernel/rcu/tree.c                                             | 4 ++--
 kernel/rcu/tree_exp.h                                         | 2 +-
 4 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/Documentation/RCU/Design/Memory-Ordering/Tree-RCU-Memory-Ordering.rst b/Documentation/RCU/Design/Memory-Ordering/Tree-RCU-Memory-Ordering.rst
index 728b1e690c64..2d7036ad7476 100644
--- a/Documentation/RCU/Design/Memory-Ordering/Tree-RCU-Memory-Ordering.rst
+++ b/Documentation/RCU/Design/Memory-Ordering/Tree-RCU-Memory-Ordering.rst
@@ -149,7 +149,7 @@ This case is handled by calls to the strongly ordered
 ``atomic_add_return()`` read-modify-write atomic operation that
 is invoked within ``rcu_dynticks_eqs_enter()`` at idle-entry
 time and within ``rcu_dynticks_eqs_exit()`` at idle-exit time.
-The grace-period kthread invokes first ``ct_dynticks_cpu_acquire()``
+The grace-period kthread invokes first ``ct_rcu_watching_cpu_acquire()``
 (preceded by a full memory barrier) and ``rcu_dynticks_in_eqs_since()``
 (both of which rely on acquire semantics) to detect idle CPUs.
 
diff --git a/include/linux/context_tracking_state.h b/include/linux/context_tracking_state.h
index ad5a06a42b4a..ad6570ffeff3 100644
--- a/include/linux/context_tracking_state.h
+++ b/include/linux/context_tracking_state.h
@@ -68,7 +68,7 @@ static __always_inline int ct_rcu_watching_cpu(int cpu)
 	return atomic_read(&ct->state) & CT_RCU_WATCHING_MASK;
 }
 
-static __always_inline int ct_dynticks_cpu_acquire(int cpu)
+static __always_inline int ct_rcu_watching_cpu_acquire(int cpu)
 {
 	struct context_tracking *ct = per_cpu_ptr(&context_tracking, cpu);
 
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index e7f612e9f7e5..45a9f3667c2a 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -323,7 +323,7 @@ static bool rcu_dynticks_in_eqs_since(struct rcu_data *rdp, int snap)
 	 * performed by the remote CPU prior to entering idle and therefore can
 	 * rely solely on acquire semantics.
 	 */
-	return snap != ct_dynticks_cpu_acquire(rdp->cpu);
+	return snap != ct_rcu_watching_cpu_acquire(rdp->cpu);
 }
 
 /*
@@ -782,7 +782,7 @@ static int dyntick_save_progress_counter(struct rcu_data *rdp)
 	 * Ordering between remote CPU's pre idle accesses and post grace period
 	 * updater's accesses is enforced by the below acquire semantic.
 	 */
-	rdp->dynticks_snap = ct_dynticks_cpu_acquire(rdp->cpu);
+	rdp->dynticks_snap = ct_rcu_watching_cpu_acquire(rdp->cpu);
 	if (rcu_dynticks_in_eqs(rdp->dynticks_snap)) {
 		trace_rcu_fqs(rcu_state.name, rdp->gp_seq, rdp->cpu, TPS("dti"));
 		rcu_gpnum_ovf(rdp->mynode, rdp);
diff --git a/kernel/rcu/tree_exp.h b/kernel/rcu/tree_exp.h
index 4acd29d16fdb..daa87fec703f 100644
--- a/kernel/rcu/tree_exp.h
+++ b/kernel/rcu/tree_exp.h
@@ -376,7 +376,7 @@ static void __sync_rcu_exp_select_node_cpus(struct rcu_exp_work *rewp)
 			 * post grace period updater's accesses is enforced by the
 			 * below acquire semantic.
 			 */
-			snap = ct_dynticks_cpu_acquire(cpu);
+			snap = ct_rcu_watching_cpu_acquire(cpu);
 			if (rcu_dynticks_in_eqs(snap))
 				mask_ofl_test |= mask;
 			else
-- 
2.40.1