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-rw-r--r--arch/s390/include/asm/barrier.h37
1 files changed, 20 insertions, 17 deletions
diff --git a/arch/s390/include/asm/barrier.h b/arch/s390/include/asm/barrier.h
index 451273ad4d34..10a508802940 100644
--- a/arch/s390/include/asm/barrier.h
+++ b/arch/s390/include/asm/barrier.h
@@ -11,25 +11,28 @@
* Force strict CPU ordering.
* And yes, this is required on UP too when we're talking
* to devices.
- *
- * This is very similar to the ppc eieio/sync instruction in that is
- * does a checkpoint syncronisation & makes sure that
- * all memory ops have completed wrt other CPU's ( see 7-15 POP DJB ).
*/
-#define eieio() asm volatile("bcr 15,0" : : : "memory")
-#define SYNC_OTHER_CORES(x) eieio()
-#define mb() eieio()
-#define rmb() eieio()
-#define wmb() eieio()
-#define read_barrier_depends() do { } while(0)
-#define smp_mb() mb()
-#define smp_rmb() rmb()
-#define smp_wmb() wmb()
-#define smp_read_barrier_depends() read_barrier_depends()
-#define smp_mb__before_clear_bit() smp_mb()
-#define smp_mb__after_clear_bit() smp_mb()
+static inline void mb(void)
+{
+#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
+ /* Fast-BCR without checkpoint synchronization */
+ asm volatile("bcr 14,0" : : : "memory");
+#else
+ asm volatile("bcr 15,0" : : : "memory");
+#endif
+}
+
+#define rmb() mb()
+#define wmb() mb()
+#define read_barrier_depends() do { } while(0)
+#define smp_mb() mb()
+#define smp_rmb() rmb()
+#define smp_wmb() wmb()
+#define smp_read_barrier_depends() read_barrier_depends()
+#define smp_mb__before_clear_bit() smp_mb()
+#define smp_mb__after_clear_bit() smp_mb()
-#define set_mb(var, value) do { var = value; mb(); } while (0)
+#define set_mb(var, value) do { var = value; mb(); } while (0)
#endif /* __ASM_BARRIER_H */