From 15cf40b2844caad4cf8da0cdaeddd132cd6adefc Mon Sep 17 00:00:00 2001
From: =?utf8?q?Dan=20Hor=C3=A1k?= <dan@danny.cz>
Date: Sun, 30 Dec 2012 17:03:36 -0500
Subject: [PATCH] implement get_cpu_clock() for s390/s390x

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 arch/arch-s390.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/arch/arch-s390.h b/arch/arch-s390.h
index fe517913..bcd91636 100644
--- a/arch/arch-s390.h
+++ b/arch/arch-s390.h
@@ -22,4 +22,22 @@
 #define read_barrier()	asm volatile("bcr 15,0" : : : "memory")
 #define write_barrier()	asm volatile("bcr 15,0" : : : "memory")
 
+static inline unsigned long long get_cpu_clock(void)
+{
+	unsigned long long clk;
+
+	__asm__ __volatile__("stck %0" : "=Q" (clk) : : "cc");
+	return clk;
+}
+
+#define ARCH_HAVE_INIT
+extern int tsc_reliable;
+static inline int arch_init(char *envp[])
+{
+	tsc_reliable = 1;
+	return 0;
+}
+
+#define ARCH_HAVE_CPU_CLOCK
+
 #endif
-- 
2.25.1