s390: define __smp_xxx

This defines __smp_xxx barriers for s390,
for use by virtualization.

Some smp_xxx barriers are removed as they are
defined correctly by asm-generic/barriers.h

Note: smp_mb, smp_rmb and smp_wmb are defined as full barriers
unconditionally on this architecture.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.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 c358c31..fbd25b2 100644 (file)
--- a/arch/s390/include/asm/barrier.h
+++ b/arch/s390/include/asm/barrier.h
@@ -26,18 +26,21 @@
 #define wmb()                          barrier()
 #define dma_rmb()                      mb()
 #define dma_wmb()                      mb()
-#define smp_mb()                       mb()
-#define smp_rmb()                      rmb()
-#define smp_wmb()                      wmb()
-
-#define smp_store_release(p, v)                                                \
+#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 {                                                                   \
        compiletime_assert_atomic_type(*p);                             \
        barrier();                                                      \
        WRITE_ONCE(*p, v);                                              \
 } while (0)
 
-#define smp_load_acquire(p)                                            \
+#define __smp_load_acquire(p)                                          \
 ({                                                                     \
        typeof(*p) ___p1 = READ_ONCE(*p);                               \
        compiletime_assert_atomic_type(*p);                             \