1 files changed, 7 insertions, 0 deletions

diff --git a/mm/compaction.c b/mm/compaction.c
index c6178bbd3e04..0aa2757399ee 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1966,6 +1966,13 @@ void wakeup_kcompactd(pg_data_t *pgdat, int order, int classzone_idx)
         if (pgdat->kcompactd_max_order < order)
                 pgdat->kcompactd_max_order = order;
 
+        /*
+         * Pairs with implicit barrier in wait_event_freezable()
+         * such that wakeups are not missed in the lockless
+         * waitqueue_active() call.
+         */
+        smp_acquire__after_ctrl_dep();
+
         if (pgdat->kcompactd_classzone_idx > classzone_idx)
                 pgdat->kcompactd_classzone_idx = classzone_idx;