1 files changed, 4 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/pseries/dtl.c b/arch/powerpc/platforms/pseries/dtl.c
index dc9b0f81e60f..fafcaa0e81ef 100644
--- a/arch/powerpc/platforms/pseries/dtl.c
+++ b/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;