[Xen-devel] [PATCH v2 15/32] powerpc: define __smp_xxx

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

This defines __smp_xxx barriers for powerpc
for use by virtualization.

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

This reduces the amount of arch-specific boiler-plate code.

Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
Acked-by: Arnd Bergmann <arnd@xxxxxxxx>
---
 arch/powerpc/include/asm/barrier.h | 24 ++++++++----------------
 1 file changed, 8 insertions(+), 16 deletions(-)

diff --git a/arch/powerpc/include/asm/barrier.h 
b/arch/powerpc/include/asm/barrier.h
index 980ad0c..c0deafc 100644
--- a/arch/powerpc/include/asm/barrier.h
+++ b/arch/powerpc/include/asm/barrier.h
@@ -44,19 +44,11 @@
 #define dma_rmb()      __lwsync()
 #define dma_wmb()      __asm__ __volatile__ (stringify_in_c(SMPWMB) : : 
:"memory")
 
-#ifdef CONFIG_SMP
-#define smp_lwsync()   __lwsync()
+#define __smp_lwsync() __lwsync()
 
-#define smp_mb()       mb()
-#define smp_rmb()      __lwsync()
-#define smp_wmb()      __asm__ __volatile__ (stringify_in_c(SMPWMB) : : 
:"memory")
-#else
-#define smp_lwsync()   barrier()
-
-#define smp_mb()       barrier()
-#define smp_rmb()      barrier()
-#define smp_wmb()      barrier()
-#endif /* CONFIG_SMP */
+#define __smp_mb()     mb()
+#define __smp_rmb()    __lwsync()
+#define __smp_wmb()    __asm__ __volatile__ (stringify_in_c(SMPWMB) : : 
:"memory")
 
 /*
  * This is a barrier which prevents following instructions from being
@@ -67,18 +59,18 @@
 #define data_barrier(x)        \
        asm volatile("twi 0,%0,0; isync" : : "r" (x) : "memory");
 
-#define smp_store_release(p, v)                                                
\
+#define __smp_store_release(p, v)                                              
\
 do {                                                                   \
        compiletime_assert_atomic_type(*p);                             \
-       smp_lwsync();                                                   \
+       __smp_lwsync();                                                 \
        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_lwsync();                                                   \
+       __smp_lwsync();                                                 \
        ___p1;                                                          \
 })
 
-- 
MST


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