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-rw-r--r--mm/compaction.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/mm/compaction.c b/mm/compaction.c
index 2c8999d027ab..a68230ab451d 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1988,6 +1988,14 @@ static void kcompactd_do_work(pg_data_t *pgdat)
compaction_defer_reset(zone, cc.order, false);
} else if (status == COMPACT_PARTIAL_SKIPPED || status == COMPACT_COMPLETE) {
/*
+ * Buddy pages may become stranded on pcps that could
+ * otherwise coalesce on the zone's free area for
+ * order >= cc.order. This is ratelimited by the
+ * upcoming deferral.
+ */
+ drain_all_pages(zone);
+
+ /*
* We use sync migration mode here, so we defer like
* sync direct compaction does.
*/