1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index b1635c4020dc..95c58c7fbdff 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -387,6 +387,13 @@ enum {
 	LRU_GEN_FILE,
 };
 
+enum {
+	LRU_GEN_CORE,
+	LRU_GEN_MM_WALK,
+	LRU_GEN_NONLEAF_YOUNG,
+	NR_LRU_GEN_CAPS
+};
+
 #define MIN_LRU_BATCH		BITS_PER_LONG
 #define MAX_LRU_BATCH		(MIN_LRU_BATCH * 64)
 
@@ -428,6 +435,8 @@ struct lru_gen_struct {
 	/* can be modified without holding the LRU lock */
 	atomic_long_t evicted[NR_HIST_GENS][ANON_AND_FILE][MAX_NR_TIERS];
 	atomic_long_t refaulted[NR_HIST_GENS][ANON_AND_FILE][MAX_NR_TIERS];
+	/* whether the multi-gen LRU is enabled */
+	bool enabled;
 };
 
 enum {