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-rw-r--r--mm/compaction.c7
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;