linux-kernel - [PATCH v2 03/27] context_tracking, rcu: Rename ct_dynticks() into ct_rcu

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Message-ID: <20240430091740.1826862-4-vschneid@redhat.com>
Date: Tue, 30 Apr 2024 11:17:07 +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 v2 03/27] context_tracking, rcu: Rename ct_dynticks() into ct_rcu_watching()

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>
---
 include/linux/context_tracking_state.h |  2 +-
 kernel/context_tracking.c              | 10 +++++-----
 kernel/rcu/tree.c                      |  2 +-
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/include/linux/context_tracking_state.h b/include/linux/context_tracking_state.h
index 94d6a935af3be..cb90d8c178104 100644
--- a/include/linux/context_tracking_state.h
+++ b/include/linux/context_tracking_state.h
@@ -56,7 +56,7 @@ static __always_inline int __ct_state(void)
 #endif
 
 #ifdef CONFIG_CONTEXT_TRACKING_IDLE
-static __always_inline int ct_dynticks(void)
+static __always_inline int ct_rcu_watching(void)
 {
 	return atomic_read(this_cpu_ptr(&context_tracking.state)) & CT_RCU_WATCHING_MASK;
 }
diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c
index 9f009de83cc8e..738a9ff4f1f51 100644
--- a/kernel/context_tracking.c
+++ b/kernel/context_tracking.c
@@ -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_dynticks());
+	trace_rcu_dyntick(TPS("Start"), ct_dynticks_nesting(), 0, ct_rcu_watching());
 	WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) && !user && !is_idle_task(current));
 	rcu_preempt_deferred_qs(current);
 
@@ -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_dynticks());
+	trace_rcu_dyntick(TPS("End"), ct_dynticks_nesting(), 1, ct_rcu_watching());
 	WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) && !user && !is_idle_task(current));
 	WRITE_ONCE(ct->dynticks_nesting, 1);
 	WARN_ON_ONCE(ct_dynticks_nmi_nesting());
@@ -220,7 +220,7 @@ void noinstr ct_nmi_exit(void)
 	 */
 	if (ct_dynticks_nmi_nesting() != 1) {
 		trace_rcu_dyntick(TPS("--="), ct_dynticks_nmi_nesting(), ct_dynticks_nmi_nesting() - 2,
-				  ct_dynticks());
+				  ct_rcu_watching());
 		WRITE_ONCE(ct->dynticks_nmi_nesting, /* No store tearing. */
 			   ct_dynticks_nmi_nesting() - 2);
 		instrumentation_end();
@@ -228,7 +228,7 @@ void noinstr ct_nmi_exit(void)
 	}
 
 	/* This NMI interrupted an RCU-idle CPU, restore RCU-idleness. */
-	trace_rcu_dyntick(TPS("Startirq"), ct_dynticks_nmi_nesting(), 0, ct_dynticks());
+	trace_rcu_dyntick(TPS("Startirq"), ct_dynticks_nmi_nesting(), 0, ct_rcu_watching());
 	WRITE_ONCE(ct->dynticks_nmi_nesting, 0); /* Avoid store tearing. */
 
 	// instrumentation for the noinstr ct_kernel_exit_state()
@@ -296,7 +296,7 @@ void noinstr ct_nmi_enter(void)
 
 	trace_rcu_dyntick(incby == 1 ? TPS("Endirq") : TPS("++="),
 			  ct_dynticks_nmi_nesting(),
-			  ct_dynticks_nmi_nesting() + incby, ct_dynticks());
+			  ct_dynticks_nmi_nesting() + incby, ct_rcu_watching());
 	instrumentation_end();
 	WRITE_ONCE(ct->dynticks_nmi_nesting, /* Prevent store tearing. */
 		   ct_dynticks_nmi_nesting() + incby);
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 84befc91799a3..db64f092428dd 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -291,7 +291,7 @@ void rcu_softirq_qs(void)
  */
 static void rcu_dynticks_eqs_online(void)
 {
-	if (ct_dynticks() & CT_RCU_WATCHING)
+	if (ct_rcu_watching() & CT_RCU_WATCHING)
 		return;
 	ct_state_inc(CT_RCU_WATCHING);
 }
-- 
2.43.0