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-rw-r--r--mm/compaction.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/mm/compaction.c b/mm/compaction.c
index 3a91a2ea3d34..b48c5259ea33 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -523,7 +523,10 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc,
if (!isolation_suitable(cc, page))
goto next_pageblock;
- /* Skip if free */
+ /*
+ * Skip if free. page_order cannot be used without zone->lock
+ * as nothing prevents parallel allocations or buddy merging.
+ */
if (PageBuddy(page))
continue;
@@ -601,7 +604,7 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc,
if (__isolate_lru_page(page, mode) != 0)
continue;
- VM_BUG_ON(PageTransCompound(page));
+ VM_BUG_ON_PAGE(PageTransCompound(page), page);
/* Successfully isolated */
cc->finished_update_migrate = true;