Use the allocator bitmap to lookup active interrupts.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 include/linux/irqnr.h |    5 +++++
 kernel/irq/irqdesc.c  |   17 +++++++++++++++++
 2 files changed, 22 insertions(+)

Index: linux-2.6-tip/include/linux/irqnr.h
===================================================================
--- linux-2.6-tip.orig/include/linux/irqnr.h
+++ linux-2.6-tip/include/linux/irqnr.h
@@ -25,6 +25,7 @@
 
 extern int nr_irqs;
 extern struct irq_desc *irq_to_desc(unsigned int irq);
+unsigned int irq_get_next_irq(unsigned int offset);
 
 # define for_each_irq_desc(irq, desc)					\
 	for (irq = 0, desc = irq_to_desc(irq); irq < nr_irqs;		\
@@ -47,6 +48,10 @@ extern struct irq_desc *irq_to_desc(unsi
 #define irq_node(irq)	0
 #endif
 
+# define for_each_active_irq(irq)			\
+	for (irq = irq_get_next_irq(0); irq < nr_irqs;	\
+	     irq = irq_get_next_irq(irq))
+
 #endif /* CONFIG_GENERIC_HARDIRQS */
 
 #define for_each_irq_nr(irq)                   \
Index: linux-2.6-tip/kernel/irq/irqdesc.c
===================================================================
--- linux-2.6-tip.orig/kernel/irq/irqdesc.c
+++ linux-2.6-tip/kernel/irq/irqdesc.c
@@ -470,6 +470,23 @@ err:
 	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)
+{
+	unsigned long flags;
+	unsigned int res;
+
+	raw_spin_lock_irqsave(&sparse_irq_lock, flags);
+	res = find_next_bit_set(allocated_irqs, nr_irqs, offset);
+	raw_spin_unlock_irqsave(&sparse_irq_lock, flags);
+	return res;
+}
+
 /* Statistics access */
 void clear_kstat_irqs(struct irq_desc *desc)
 {


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