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-rw-r--r--arch/powerpc/platforms/pseries/dtl.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/dtl.c b/arch/powerpc/platforms/pseries/dtl.c
index dc9b0f81e60..fafcaa0e81e 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;