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-rw-r--r--include/linux/irq.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/irq.h b/include/linux/irq.h
index 3c1c96786248..0817afd0d719 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -133,7 +133,9 @@ struct irq_domain;
* Use accessor functions to deal with it
* @node: node index useful for balancing
* @handler_data: per-IRQ data for the irq_chip methods
- * @affinity: IRQ affinity on SMP
+ * @affinity: IRQ affinity on SMP. If this is an IPI
+ * related irq, then this is the mask of the
+ * CPUs to which an IPI can be sent.
* @msi_desc: MSI descriptor
*/
struct irq_common_data {
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