[ofa-general] [PATCH] libibverbs: Replace eieio with sync for PPC wmb()

[Shirley Ma]

Hello Roland,

	We have found that the wmb() for PPC was incorrect defined as eieio
instruction in libibverbs. Instruction eieio applies either in a pure
I/O memory or a pure system memory. In the situation where the device
drivers use the d_map kernel services to share a portion of system
memory with an I/O adapter, we need to use sync() instead. See below
link for reference.

http://www.ibm.com/developerworks/eserver/articles/powerpc.html

Signed-off-by: Shirley Ma <xma at us.ibm.com>

-------
 include/infiniband/arch.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/include/infiniband/arch.h b/include/infiniband/arch.h
index 6931bfc..d3e356f 100644
--- a/include/infiniband/arch.h
+++ b/include/infiniband/arch.h
@@ -98,7 +98,7 @@ static inline uint64_t ntohll(uint64_t x) { return x; }
 
 #define mb()	 asm volatile("sync" ::: "memory")
 #define rmb()	 mb()
-#define wmb()	 asm volatile("eieio" ::: "memory")
+#define wmb()	 mb() 
 #define wc_wmb() wmb()
 
 #elif defined(__sparc_v9__)