[PATCH-tip] genirq: Add missing documentation for tot_count

[Waiman Long]

Commit 1136b0728969 ("genirq: Avoid summation loops for /proc/stat") adds
a new tot_count field to the irq_desc structure without documenting it.
This patch adds the missing piece of documentation.

Signed-off-by: Waiman Long <longman@xxxxxxxxxx>
---
 include/linux/irqdesc.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/irqdesc.h b/include/linux/irqdesc.h
index 875c41b..1d679fe 100644
--- a/include/linux/irqdesc.h
+++ b/include/linux/irqdesc.h
@@ -28,6 +28,7 @@
  * @core_internal_state__do_not_mess_with_it: core internal status information
  * @depth:		disable-depth, for nested irq_disable() calls
  * @wake_depth:		enable depth, for multiple irq_set_irq_wake() callers
+ * @tot_count:		stats field for non-percpu irqs
  * @irq_count:		stats field to detect stalled irqs
  * @last_unhandled:	aging timer for unhandled count
  * @irqs_unhandled:	stats field for spurious unhandled interrupts
-- 
1.8.3.1