[RFC 01/10] Add !MEMCG memcg_list_lru_alloc implementation

[David Stevens]

Add a stub implementation of memcg_list_lru_alloc() when CONFIG_MEMCG
isn't enabled.

Signed-off-by: David Stevens <stevensd@xxxxxxxxxx>
---
 include/linux/list_lru.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/include/linux/list_lru.h b/include/linux/list_lru.h
index a450fffe1550..40eaeaa3424c 100644
--- a/include/linux/list_lru.h
+++ b/include/linux/list_lru.h
@@ -79,10 +79,10 @@ static inline int list_lru_init_memcg_key(struct list_lru *lru, struct shrinker
 	return list_lru_init_memcg(lru, shrinker);
 }
 
+#ifdef CONFIG_MEMCG
 int memcg_list_lru_alloc(struct mem_cgroup *memcg, struct list_lru *lru,
 			 gfp_t gfp);
 
-#ifdef CONFIG_MEMCG
 /**
  * folio_memcg_list_lru_alloc - allocate list_lru heads for shrinkable folio
  * @folio: the newly allocated & charged folio
@@ -106,6 +106,11 @@ static inline int folio_memcg_list_lru_alloc(struct folio *folio,
 {
 	return 0;
 }
+
+static inline int memcg_list_lru_alloc(struct mem_cgroup *memcg, struct list_lru *lru, gfp_t gfp)
+{
+	return 0;
+}
 #endif
 
 void memcg_reparent_list_lrus(struct mem_cgroup *memcg, struct mem_cgroup *parent);
-- 
2.55.0.897.gb25b4bd76c-goog