[S390] get_clock inline assembly.

Add missing volatile to the get_clock / get_cycles inline assemblies
to avoid that consecutive calls get optimized away.

Signed-off-by: Andreas Krebbel <krebbel1@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 4848057..5d0332a 100644 (file)
--- a/include/asm-s390/timex.h
+++ b/include/asm-s390/timex.h
@@ -19,7 +19,7 @@ static inline cycles_t get_cycles(void)
 {
        cycles_t cycles;
 
-       __asm__("stck 0(%1)" : "=m" (cycles) : "a" (&cycles) : "cc");
+       __asm__ __volatile__ ("stck 0(%1)" : "=m" (cycles) : "a" (&cycles) : "cc");
        return cycles >> 2;
 }
 
@@ -27,7 +27,7 @@ static inline unsigned long long get_clock (void)
 {
        unsigned long long clk;
 
-       __asm__("stck 0(%1)" : "=m" (clk) : "a" (&clk) : "cc");
+       __asm__ __volatile__ ("stck 0(%1)" : "=m" (clk) : "a" (&clk) : "cc");
        return clk;
 }