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 fe51791..bcd9163 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