Use the allocator bitmap to lookup active interrupts.
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
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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