[S390] ap bus: add support for irq statistics

Add support for AP Bus I/O interrupt statistics in /proc/interrupts.

Signed-off-by: Holger Dengler <hd@linux.vnet.ibm.com>
Signed-off-by: Felix Beck <felix.beck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/kernel/irq.c b/arch/s390/kernel/irq.c
index 57ed2b5..ea5099c 100644
--- a/arch/s390/kernel/irq.c
+++ b/arch/s390/kernel/irq.c
@@ -42,6 +42,7 @@
 	{.name = "LCS", .desc = "[I/O] LCS" },
 	{.name = "CLW", .desc = "[I/O] CLAW" },
 	{.name = "CTC", .desc = "[I/O] CTC" },
+	{.name = "APB", .desc = "[I/O] AP Bus" },
 	{.name = "NMI", .desc = "[NMI] Machine Check" },
 };