genirq: Implement sane enumeration
Use the allocator bitmap to lookup active interrupts.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index 6312a2c..2e7e94e 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -463,6 +463,17 @@
return ret;
}
+/**
+ * irq_get_next_irq - get next allocated irq number
+ * @offset: where to start the search
+ *
+ * Returns next irq number after offset or nr_irqs if none is found.
+ */
+unsigned int irq_get_next_irq(unsigned int offset)
+{
+ return find_next_bit(allocated_irqs, nr_irqs, offset);
+}
+
/* Statistics access */
void clear_kstat_irqs(struct irq_desc *desc)
{
