context_tracking, rcu: Rename DYNTICK_IRQ_NONIDLE into CT_NESTING_IRQ_NONIDLE

The context_tracking.state RCU_DYNTICKS subvariable has been renamed to
RCU_WATCHING, and the 'dynticks' prefix can be dropped without losing any
meaning.
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

@@ -7,7 +7,7 @@
 #include <linux/context_tracking_irq.h>
 
 /* Offset to allow distinguishing irq vs. task-based idle entry/exit. */
-#define DYNTICK_IRQ_NONIDLE	((LONG_MAX / 2) + 1)
+#define CT_NESTING_IRQ_NONIDLE	((LONG_MAX / 2) + 1)
 
 enum ctx_state {
 	CT_STATE_DISABLED	= -1,	/* returned by ct_state() if unknown */

kernel/context_tracking.c

@@ -29,7 +29,7 @@
 DEFINE_PER_CPU(struct context_tracking, context_tracking) = {
 #ifdef CONFIG_CONTEXT_TRACKING_IDLE
 	.nesting = 1,
-	.nmi_nesting = DYNTICK_IRQ_NONIDLE,
+	.nmi_nesting = CT_NESTING_IRQ_NONIDLE,
 #endif
 	.state = ATOMIC_INIT(CT_RCU_WATCHING),
 };
@@ -125,7 +125,7 @@ static void noinstr ct_kernel_exit(bool user, int offset)
 {
 	struct context_tracking *ct = this_cpu_ptr(&context_tracking);
 
-	WARN_ON_ONCE(ct_nmi_nesting() != DYNTICK_IRQ_NONIDLE);
+	WARN_ON_ONCE(ct_nmi_nesting() != CT_NESTING_IRQ_NONIDLE);
 	WRITE_ONCE(ct->nmi_nesting, 0);
 	WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) &&
 		     ct_nesting() == 0);
@@ -156,7 +156,7 @@ static void noinstr ct_kernel_exit(bool user, int offset)
  * Exit an RCU extended quiescent state, which can be either the
  * idle loop or adaptive-tickless usermode execution.
  *
- * We crowbar the ->nmi_nesting field to DYNTICK_IRQ_NONIDLE to
+ * We crowbar the ->nmi_nesting field to CT_NESTING_IRQ_NONIDLE to
  * allow for the possibility of usermode upcalls messing up our count of
  * interrupt nesting level during the busy period that is just now starting.
  */
@@ -186,7 +186,7 @@ static void noinstr ct_kernel_enter(bool user, int offset)
 	WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) && !user && !is_idle_task(current));
 	WRITE_ONCE(ct->nesting, 1);
 	WARN_ON_ONCE(ct_nmi_nesting());
-	WRITE_ONCE(ct->nmi_nesting, DYNTICK_IRQ_NONIDLE);
+	WRITE_ONCE(ct->nmi_nesting, CT_NESTING_IRQ_NONIDLE);
 	instrumentation_end();
 }
 

kernel/rcu/tree.c

@@ -599,7 +599,7 @@ void rcu_irq_exit_check_preempt(void)
 	RCU_LOCKDEP_WARN(ct_nesting() <= 0,
 			 "RCU nesting counter underflow/zero!");
 	RCU_LOCKDEP_WARN(ct_nmi_nesting() !=
-			 DYNTICK_IRQ_NONIDLE,
+			 CT_NESTING_IRQ_NONIDLE,
 			 "Bad RCU  nmi_nesting counter\n");
 	RCU_LOCKDEP_WARN(rcu_dynticks_curr_cpu_in_eqs(),
 			 "RCU in extended quiescent state!");