LRU-lock isn't required for balloon page isolation. This check makes migration
of some ballooned pages mostly impossible because isolate_migratepages_range()
drops LRU lock periodically.
Signed-off-by: Konstantin Khlebnikov <k.khlebnikov@xxxxxxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx> # v3.8
---
mm/compaction.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/compaction.c b/mm/compaction.c
index 21bf292..0653f5f 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -597,7 +597,7 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc,
*/
if (!PageLRU(page)) {
if (unlikely(balloon_page_movable(page))) {
- if (locked && balloon_page_isolate(page)) {
+ if (balloon_page_isolate(page)) {
/* Successfully isolated */
goto isolate_success;
}
--
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