linux-kernel - [PATCH v3 16/25] rcu: Rename rcu_dynticks_in_eqs() into rcu_watching_snap_in

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Message-ID: <20240724144325.3307148-17-vschneid@redhat.com>
Date: Wed, 24 Jul 2024 16:43:16 +0200
From: Valentin Schneider <vschneid@...hat.com>
To: rcu@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Frederic Weisbecker <frederic@...nel.org>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Neeraj Upadhyay <quic_neeraju@...cinc.com>,
	Joel Fernandes <joel@...lfernandes.org>,
	Josh Triplett <josh@...htriplett.org>,
	Boqun Feng <boqun.feng@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Zqiang <qiang.zhang1211@...il.com>
Subject: [PATCH v3 16/25] rcu: Rename rcu_dynticks_in_eqs() into rcu_watching_snap_in_eqs()

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

While at it, update a comment that still refers to rcu_dynticks_snap(),
which was removed by commit:

  7be2e6323b9b ("rcu: Remove full memory barrier on RCU stall printout")

Signed-off-by: Valentin Schneider <vschneid@...hat.com>
Reviewed-by: Frederic Weisbecker <frederic@...nel.org>
---
 kernel/rcu/tree.c       | 8 ++++----
 kernel/rcu/tree_exp.h   | 2 +-
 kernel/rcu/tree_stall.h | 2 +-
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index ffec0e7513466..7c2bd7e511579 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -300,10 +300,10 @@ static void rcu_watching_online(void)
 }
 
 /*
- * Return true if the snapshot returned from rcu_dynticks_snap()
+ * Return true if the snapshot returned from ct_rcu_watching()
  * indicates that RCU is in an extended quiescent state.
  */
-static bool rcu_dynticks_in_eqs(int snap)
+static bool rcu_watching_snap_in_eqs(int snap)
 {
 	return !(snap & CT_RCU_WATCHING);
 }
@@ -769,7 +769,7 @@ static int dyntick_save_progress_counter(struct rcu_data *rdp)
 	 * with chained smp_mb__after_unlock_lock().
 	 */
 	rdp->dynticks_snap = ct_rcu_watching_cpu_acquire(rdp->cpu);
-	if (rcu_dynticks_in_eqs(rdp->dynticks_snap)) {
+	if (rcu_watching_snap_in_eqs(rdp->dynticks_snap)) {
 		trace_rcu_fqs(rcu_state.name, rdp->gp_seq, rdp->cpu, TPS("dti"));
 		rcu_gpnum_ovf(rdp->mynode, rdp);
 		return 1;
@@ -4793,7 +4793,7 @@ rcu_boot_init_percpu_data(int cpu)
 	rdp->grpmask = leaf_node_cpu_bit(rdp->mynode, cpu);
 	INIT_WORK(&rdp->strict_work, strict_work_handler);
 	WARN_ON_ONCE(ct->nesting != 1);
-	WARN_ON_ONCE(rcu_dynticks_in_eqs(ct_rcu_watching_cpu(cpu)));
+	WARN_ON_ONCE(rcu_watching_snap_in_eqs(ct_rcu_watching_cpu(cpu)));
 	rdp->barrier_seq_snap = rcu_state.barrier_sequence;
 	rdp->rcu_ofl_gp_seq = rcu_state.gp_seq;
 	rdp->rcu_ofl_gp_state = RCU_GP_CLEANED;
diff --git a/kernel/rcu/tree_exp.h b/kernel/rcu/tree_exp.h
index 89cbadb15a4e7..8453da73a7df2 100644
--- a/kernel/rcu/tree_exp.h
+++ b/kernel/rcu/tree_exp.h
@@ -369,7 +369,7 @@ static void __sync_rcu_exp_select_node_cpus(struct rcu_exp_work *rewp)
 			 * smp_mb__after_unlock_lock().
 			 */
 			snap = ct_rcu_watching_cpu_acquire(cpu);
-			if (rcu_dynticks_in_eqs(snap))
+			if (rcu_watching_snap_in_eqs(snap))
 				mask_ofl_test |= mask;
 			else
 				rdp->exp_dynticks_snap = snap;
diff --git a/kernel/rcu/tree_stall.h b/kernel/rcu/tree_stall.h
index ec49f0155becc..e933c6a58d5fd 100644
--- a/kernel/rcu/tree_stall.h
+++ b/kernel/rcu/tree_stall.h
@@ -501,7 +501,7 @@ static void print_cpu_stall_info(int cpu)
 	}
 	delta = rcu_seq_ctr(rdp->mynode->gp_seq - rdp->rcu_iw_gp_seq);
 	falsepositive = rcu_is_gp_kthread_starving(NULL) &&
-			rcu_dynticks_in_eqs(ct_rcu_watching_cpu(cpu));
+			rcu_watching_snap_in_eqs(ct_rcu_watching_cpu(cpu));
 	rcuc_starved = rcu_is_rcuc_kthread_starving(rdp, &j);
 	if (rcuc_starved)
 		// Print signed value, as negative values indicate a probable bug.
-- 
2.43.0