syslet: add proper read barrier between user_tail and completion read

[fio.git] / arch / arch-ppc.h

diff --git a/arch/arch-ppc.h b/arch/arch-ppc.h
index 0a23c01a56d2c07325930c433e50c6dded20d949..978313196d4c885690d47a7a6a67542b523b6d60 100644 (file)
--- a/arch/arch-ppc.h
+++ b/arch/arch-ppc.h
@@ -20,6 +20,14 @@
 
 #define nop    do { } while (0)
 
+#ifdef __powerpc64__
+#define read_barrier() \
+       __asm__ __volatile__ ("lwsync" : : : "memory")
+#else
+#define read_barrier() \
+       __asm__ __volatile__ ("sync" : : : "memory")
+#endif
+
 static inline int __ilog2(unsigned long bitmask)
 {
        int lz;