linux-kernel - [PATCH v3 07/25] context_tracking, rcu: Rename ct_dynticks_nesting() into ct

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Message-ID: <20240724144325.3307148-8-vschneid@redhat.com>
Date: Wed, 24 Jul 2024 16:43:07 +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 07/25] context_tracking, rcu: Rename ct_dynticks_nesting() into ct_nesting()

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

Suggested-by: Frederic Weisbecker <frederic@...nel.org>
Signed-off-by: Valentin Schneider <vschneid@...hat.com>
Reviewed-by: Frederic Weisbecker <frederic@...nel.org>
---
 include/linux/context_tracking_state.h |  2 +-
 kernel/context_tracking.c              | 10 +++++-----
 kernel/rcu/tree.c                      |  6 +++---
 3 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/include/linux/context_tracking_state.h b/include/linux/context_tracking_state.h
index 65290e7677e6c..586c1ff22c2e9 100644
--- a/include/linux/context_tracking_state.h
+++ b/include/linux/context_tracking_state.h
@@ -75,7 +75,7 @@ static __always_inline int ct_rcu_watching_cpu_acquire(int cpu)
 	return atomic_read_acquire(&ct->state) & CT_RCU_WATCHING_MASK;
 }
 
-static __always_inline long ct_dynticks_nesting(void)
+static __always_inline long ct_nesting(void)
 {
 	return __this_cpu_read(context_tracking.nesting);
 }
diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c
index 5cfdfc03b4018..a951bde0bbcbb 100644
--- a/kernel/context_tracking.c
+++ b/kernel/context_tracking.c
@@ -128,8 +128,8 @@ static void noinstr ct_kernel_exit(bool user, int offset)
 	WARN_ON_ONCE(ct_dynticks_nmi_nesting() != DYNTICK_IRQ_NONIDLE);
 	WRITE_ONCE(ct->dynticks_nmi_nesting, 0);
 	WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) &&
-		     ct_dynticks_nesting() == 0);
-	if (ct_dynticks_nesting() != 1) {
+		     ct_nesting() == 0);
+	if (ct_nesting() != 1) {
 		// RCU will still be watching, so just do accounting and leave.
 		ct->nesting--;
 		return;
@@ -137,7 +137,7 @@ static void noinstr ct_kernel_exit(bool user, int offset)
 
 	instrumentation_begin();
 	lockdep_assert_irqs_disabled();
-	trace_rcu_dyntick(TPS("Start"), ct_dynticks_nesting(), 0, ct_rcu_watching());
+	trace_rcu_dyntick(TPS("Start"), ct_nesting(), 0, ct_rcu_watching());
 	WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) && !user && !is_idle_task(current));
 	rcu_preempt_deferred_qs(current);
 
@@ -166,7 +166,7 @@ static void noinstr ct_kernel_enter(bool user, int offset)
 	long oldval;
 
 	WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) && !raw_irqs_disabled());
-	oldval = ct_dynticks_nesting();
+	oldval = ct_nesting();
 	WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) && oldval < 0);
 	if (oldval) {
 		// RCU was already watching, so just do accounting and leave.
@@ -182,7 +182,7 @@ static void noinstr ct_kernel_enter(bool user, int offset)
 	// instrumentation for the noinstr ct_kernel_enter_state()
 	instrument_atomic_write(&ct->state, sizeof(ct->state));
 
-	trace_rcu_dyntick(TPS("End"), ct_dynticks_nesting(), 1, ct_rcu_watching());
+	trace_rcu_dyntick(TPS("End"), ct_nesting(), 1, ct_rcu_watching());
 	WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) && !user && !is_idle_task(current));
 	WRITE_ONCE(ct->nesting, 1);
 	WARN_ON_ONCE(ct_dynticks_nmi_nesting());
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 16007911c7890..35042ffeca73b 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -380,7 +380,7 @@ static int rcu_is_cpu_rrupt_from_idle(void)
 	lockdep_assert_irqs_disabled();
 
 	/* Check for counter underflows */
-	RCU_LOCKDEP_WARN(ct_dynticks_nesting() < 0,
+	RCU_LOCKDEP_WARN(ct_nesting() < 0,
 			 "RCU nesting counter underflow!");
 	RCU_LOCKDEP_WARN(ct_dynticks_nmi_nesting() <= 0,
 			 "RCU dynticks_nmi_nesting counter underflow/zero!");
@@ -396,7 +396,7 @@ static int rcu_is_cpu_rrupt_from_idle(void)
 	WARN_ON_ONCE(!nesting && !is_idle_task(current));
 
 	/* Does CPU appear to be idle from an RCU standpoint? */
-	return ct_dynticks_nesting() == 0;
+	return ct_nesting() == 0;
 }
 
 #define DEFAULT_RCU_BLIMIT (IS_ENABLED(CONFIG_RCU_STRICT_GRACE_PERIOD) ? 1000 : 10)
@@ -588,7 +588,7 @@ void rcu_irq_exit_check_preempt(void)
 {
 	lockdep_assert_irqs_disabled();
 
-	RCU_LOCKDEP_WARN(ct_dynticks_nesting() <= 0,
+	RCU_LOCKDEP_WARN(ct_nesting() <= 0,
 			 "RCU nesting counter underflow/zero!");
 	RCU_LOCKDEP_WARN(ct_dynticks_nmi_nesting() !=
 			 DYNTICK_IRQ_NONIDLE,
-- 
2.43.0