[SPARC64]: store-init needs trailing membar.

The manual says that it is required and we actually have crash reports
where loads see stale data due to not having membars here.

In one case the networking does:

	memset(skb, 0, offsetof(struct sk_buff, truesize));

and then some code later checks skb->nohdr for zero, but it's still
the value that was there before the memset().

Note that arch/sparc64/lib/xor.S already got this right.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/sparc64/lib/NGmemcpy.S b/arch/sparc64/lib/NGmemcpy.S
index 8e522b3dc095..66063a9a66b8 100644
--- a/arch/sparc64/lib/NGmemcpy.S
+++ b/arch/sparc64/lib/NGmemcpy.S
@@ -247,6 +247,8 @@ FUNC_NAME:	/* %o0=dst, %o1=src, %o2=len */
         /* fall through */
 
 60:     
+        membar          #Sync
+
         /* %o2 contains any final bytes still needed to be copied
          * over. If anything is left, we copy it one byte at a time.
          */