implement get_cpu_clock() for s390/s390x

Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/arch/arch-s390.h b/arch/arch-s390.h
index fe5179134891d66d944797ee8132f2a306e4513c..bcd91636d04d8e6e3bd2137672377f84813cd57e 100644 (file)
--- 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