From 1ec2772e0c3ca3159035c03165355e355efc326b Mon Sep 17 00:00:00 2001
From: Martin Schwidefsky <schwidefsky@de.ibm.com>
Date: Thu, 20 Aug 2015 17:28:44 +0200
Subject: s390/diag: add a statistic for diagnose calls

Introduce /sys/debug/kernel/diag_stat with a statistic how many diagnose
calls have been done by each CPU in the system.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---
 arch/s390/mm/fault.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'arch/s390/mm/fault.c')

diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index f985856a538b..77b3938d6bfa 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -30,6 +30,7 @@
 #include <linux/uaccess.h>
 #include <linux/hugetlb.h>
 #include <asm/asm-offsets.h>
+#include <asm/diag.h>
 #include <asm/pgtable.h>
 #include <asm/irq.h>
 #include <asm/mmu_context.h>
@@ -597,6 +598,7 @@ int pfault_init(void)
 
 	if (pfault_disable)
 		return -1;
+	diag_stat_inc(DIAG_STAT_X258);
 	asm volatile(
 		"	diag	%1,%0,0x258\n"
 		"0:	j	2f\n"
@@ -618,6 +620,7 @@ void pfault_fini(void)
 
 	if (pfault_disable)
 		return;
+	diag_stat_inc(DIAG_STAT_X258);
 	asm volatile(
 		"	diag	%0,0,0x258\n"
 		"0:\n"
-- 
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