s390: use generic memory barriers

The s390 kernel is SMP to 99.99%, we just didn't bother with a
non-smp variant for the memory-barriers. If the generic header
is used we'd get the non-smp version for free. It will save a
small amount of text space for CONFIG_SMP=n.

Suggested-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>

diff --git a/arch/s390/include/asm/barrier.h b/arch/s390/include/asm/barrier.h
index fbd25b2..4d26fa4 100644 (file)
--- a/arch/s390/include/asm/barrier.h
+++ b/arch/s390/include/asm/barrier.h
@@ -29,9 +29,6 @@
 #define __smp_mb()                     mb()
 #define __smp_rmb()                    rmb()
 #define __smp_wmb()                    wmb()
-#define smp_mb()                       __smp_mb()
-#define smp_rmb()                      __smp_rmb()
-#define smp_wmb()                      __smp_wmb()
 
 #define __smp_store_release(p, v)                                      \
 do {                                                                   \