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

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;
 }

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);

kernel/rcu/tree.c

@@ -294,7 +294,7 @@ 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);
 }