s390/time: fix get_tod_clock_ext inline assembly

commit 7ab64a85e1a009046f97413a573e83fd85f7804d upstream.

The get_tod_clock_ext inline assembly does not specify its output
operands correctly. This can cause incorrect code to be generated.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/s390/include/asm/timex.h b/arch/s390/include/asm/timex.h
index 819b94d2272054d318fdd12c31b8718a9e4bb0bd..8beee1cceba4ed17831736a11c6f5167155335d6 100644 (file)
--- a/arch/s390/include/asm/timex.h
+++ b/arch/s390/include/asm/timex.h
@@ -71,9 +71,11 @@ static inline void local_tick_enable(unsigned long long comp)
 
 typedef unsigned long long cycles_t;
 
-static inline void get_tod_clock_ext(char *clk)
+static inline void get_tod_clock_ext(char clk[16])
 {
-       asm volatile("stcke %0" : "=Q" (*clk) : : "cc");
+       typedef struct { char _[sizeof(clk)]; } addrtype;
+
+       asm volatile("stcke %0" : "=Q" (*(addrtype *) clk) : : "cc");
 }
 
 static inline unsigned long long get_tod_clock(void)