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@kernel.org>
Signed-off-by: Valentin Schneider <vschneid@redhat.com>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Neeraj Upadhyay <neeraj.upadhyay@kernel.org>

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);
 }

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());

kernel/rcu/tree.c

@@ -388,7 +388,7 @@ 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!");
@@ -404,7 +404,7 @@ 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)
@@ -596,7 +596,7 @@ 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,