diff --git a/[refs] b/[refs]
index 375c37078d55..73fe42aedc81 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 757c74d298dc8438760b8dea275c4c6e0ac8a77f
+refs/heads/master: 82631f5dd114e52239fb3d1e270a49d37c088b46
diff --git a/trunk/arch/powerpc/platforms/pseries/dtl.c b/trunk/arch/powerpc/platforms/pseries/dtl.c
index dc9b0f81e60f..fafcaa0e81ef 100644
--- a/trunk/arch/powerpc/platforms/pseries/dtl.c
+++ b/trunk/arch/powerpc/platforms/pseries/dtl.c
@@ -107,6 +107,10 @@ static int dtl_enable(struct dtl *dtl)
 	/* set our initial buffer indices */
 	dtl->last_idx = lppaca[dtl->cpu].dtl_idx = 0;
 
+	/* ensure that our updates to the lppaca fields have occurred before
+	 * we actually enable the logging */
+	smp_wmb();
+
 	/* enable event logging */
 	lppaca[dtl->cpu].dtl_enable_mask = dtl_event_mask;