[patch 16/55] genirq/irqdomain: Add map counter

[Thomas Gleixner]

Add a map counter instead of counting radix tree entries for
diagnosis. That also gives correct information for linear domains.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
 include/linux/irqdomain.h |    2 ++
 kernel/irq/irqdomain.c    |    4 ++++
 2 files changed, 6 insertions(+)

--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -130,6 +130,7 @@ struct irq_domain_chip_generic;
  * @host_data: private data pointer for use by owner.  Not touched by irq_domain
  *             core code.
  * @flags: host per irq_domain flags
+ * @mapcount: The number of mapped interrupts
  *
  * Optional elements
  * @of_node: Pointer to device tree nodes associated with the irq_domain. Used
@@ -152,6 +153,7 @@ struct irq_domain {
 	const struct irq_domain_ops *ops;
 	void *host_data;
 	unsigned int flags;
+	unsigned int mapcount;
 
 	/* Optional data */
 	struct fwnode_handle *fwnode;
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -401,6 +401,7 @@ void irq_domain_disassociate(struct irq_
 
 	irq_data->domain = NULL;
 	irq_data->hwirq = 0;
+	domain->mapcount--;
 
 	/* Clear reverse map for this hwirq */
 	if (hwirq < domain->revmap_size) {
@@ -452,6 +453,7 @@ int irq_domain_associate(struct irq_doma
 			domain->name = irq_data->chip->name;
 	}
 
+	domain->mapcount++;
 	if (hwirq < domain->revmap_size) {
 		domain->linear_revmap[hwirq] = virq;
 	} else {
@@ -1059,6 +1061,7 @@ static void irq_domain_insert_irq(int vi
 		struct irq_domain *domain = data->domain;
 		irq_hw_number_t hwirq = data->hwirq;
 
+		domain->mapcount++;
 		if (hwirq < domain->revmap_size) {
 			domain->linear_revmap[hwirq] = virq;
 		} else {
@@ -1088,6 +1091,7 @@ static void irq_domain_remove_irq(int vi
 		struct irq_domain *domain = data->domain;
 		irq_hw_number_t hwirq = data->hwirq;
 
+		domain->mapcount--;
 		if (hwirq < domain->revmap_size) {
 			domain->linear_revmap[hwirq] = 0;
 		} else {