[Xen-devel] [PATCH v2 27/32] x86: define __smp_xxx

["Michael S. Tsirkin" <mst@xxxxxxxxxx>]

This defines __smp_xxx barriers for x86,
for use by virtualization.

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

Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
Acked-by: Arnd Bergmann <arnd@xxxxxxxx>
---
 arch/x86/include/asm/barrier.h | 31 ++++++++++++-------------------
 1 file changed, 12 insertions(+), 19 deletions(-)

diff --git a/arch/x86/include/asm/barrier.h b/arch/x86/include/asm/barrier.h
index cc4c2a7..a584e1c 100644
--- a/arch/x86/include/asm/barrier.h
+++ b/arch/x86/include/asm/barrier.h
@@ -31,17 +31,10 @@
 #endif
 #define dma_wmb()      barrier()
 
-#ifdef CONFIG_SMP
-#define smp_mb()       mb()
-#define smp_rmb()      dma_rmb()
-#define smp_wmb()      barrier()
-#define smp_store_mb(var, value) do { (void)xchg(&var, value); } while (0)
-#else /* !SMP */
-#define smp_mb()       barrier()
-#define smp_rmb()      barrier()
-#define smp_wmb()      barrier()
-#define smp_store_mb(var, value) do { WRITE_ONCE(var, value); barrier(); } 
while (0)
-#endif /* SMP */
+#define __smp_mb()     mb()
+#define __smp_rmb()    dma_rmb()
+#define __smp_wmb()    barrier()
+#define __smp_store_mb(var, value) do { (void)xchg(&var, value); } while (0)
 
 #if defined(CONFIG_X86_PPRO_FENCE)
 
@@ -50,31 +43,31 @@
  * model and we should fall back to full barriers.
  */
 
-#define smp_store_release(p, v)                                                
\
+#define __smp_store_release(p, v)                                      \
 do {                                                                   \
        compiletime_assert_atomic_type(*p);                             \
-       smp_mb();                                                       \
+       __smp_mb();                                                     \
        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);                             \
-       smp_mb();                                                       \
+       __smp_mb();                                                     \
        ___p1;                                                          \
 })
 
 #else /* regular x86 TSO memory ordering */
 
-#define smp_store_release(p, v)                                                
\
+#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);                             \
@@ -85,8 +78,8 @@ do {                                                          
        \
 #endif
 
 /* Atomic operations are already serializing on x86 */
-#define smp_mb__before_atomic()        barrier()
-#define smp_mb__after_atomic() barrier()
+#define __smp_mb__before_atomic()      barrier()
+#define __smp_mb__after_atomic()       barrier()
 
 #include <asm-generic/barrier.h>
 
-- 
MST


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