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-rw-r--r--mm/mmzone.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/mm/mmzone.c b/mm/mmzone.c
index d8a9b0e1b526..0ae7571e35ab 100644
--- a/mm/mmzone.c
+++ b/mm/mmzone.c
@@ -81,6 +81,13 @@ void lruvec_init(struct lruvec *lruvec)
for_each_lru(lru)
INIT_LIST_HEAD(&lruvec->lists[lru]);
+ /*
+ * The "Unevictable LRU" is imaginary: though its size is maintained,
+ * it is never scanned, and unevictable pages are not threaded on it
+ * (so that their lru fields can be reused to hold mlock_count).
+ * Poison its list head, so that any operations on it would crash.
+ */
+ list_del(&lruvec->lists[LRU_UNEVICTABLE]);
}
#if defined(CONFIG_NUMA_BALANCING) && !defined(LAST_CPUPID_NOT_IN_PAGE_FLAGS)