genirq: irqchip: Add mask to block out invalid irqs

Some controllers have irqs that aren't wired up and must never be used.
For the generic chip attached to an irq_domain this provides a mask that
can be used to block out particular irqs so that they never get mapped.

Signed-off-by: Grant Likely <grant.likely@linaro.org>
Link: http://lkml.kernel.org/r/1369793454-19197-2-git-send-email-grant.likely@linaro.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/irq.h b/include/linux/irq.h
index af7052c6a45c..298a9b9ce675 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -679,6 +679,7 @@ struct irq_chip_type {
  * @num_ct:             Number of available irq_chip_type instances (usually 1)
  * @private:            Private data for non generic chip callbacks
  * @installed:          bitfield to denote installed interrupts
+ * @unused:             bitfield to denote unused interrupts
  * @domain:             irq domain pointer
  * @list:               List head for keeping track of instances
  * @chip_types:         Array of interrupt irq_chip_types
@@ -702,6 +703,7 @@ struct irq_chip_generic {
         unsigned int            num_ct;
         void                    *private;
         unsigned long           installed;
+        unsigned long           unused;
         struct irq_domain       *domain;
         struct list_head        list;
         struct irq_chip_type    chip_types[0];