[S390] Get rid of a lot of sparse warnings.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/include/asm-s390/timex.h b/include/asm-s390/timex.h
index 4df4a41..9ee5d80 100644
--- a/include/asm-s390/timex.h
+++ b/include/asm-s390/timex.h
@@ -32,4 +32,6 @@
 	return (cycles_t) get_clock() >> 2;
 }
 
+void init_cpu_timer(void);
+
 #endif