[PATCH 24/28] list_lru.h: move declarations to list_lru_types.h

[Max Kellermann]

By providing declarations in a lean header, we can reduce header
dependencies.

Signed-off-by: Max Kellermann <max.kellermann@xxxxxxxxx>
---
 fs/super.c                     |  1 +
 include/linux/fs.h             |  2 +-
 include/linux/list_lru.h       | 36 +----------------------------
 include/linux/list_lru_types.h | 42 ++++++++++++++++++++++++++++++++++
 4 files changed, 45 insertions(+), 36 deletions(-)
 create mode 100644 include/linux/list_lru_types.h

diff --git a/fs/super.c b/fs/super.c
index d35e85295489..a1d4d9dfa79a 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -33,6 +33,7 @@
 #include <linux/rculist_bl.h>
 #include <linux/fscrypt.h>
 #include <linux/fsnotify.h>
+#include <linux/list_lru.h>
 #include <linux/lockdep.h>
 #include <linux/user_namespace.h>
 #include <linux/fs_context.h>
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 7b37a22c9513..06eda3a4fb52 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -10,7 +10,7 @@
 #include <linux/stat.h>
 #include <linux/cache.h>
 #include <linux/list.h>
-#include <linux/list_lru.h>
+#include <linux/list_lru_types.h>
 #include <linux/llist.h>
 #include <linux/xarray.h>
 #include <linux/rbtree.h>
diff --git a/include/linux/list_lru.h b/include/linux/list_lru.h
index bf0b71faa059..3a72e8cde939 100644
--- a/include/linux/list_lru.h
+++ b/include/linux/list_lru.h
@@ -8,14 +8,10 @@
 #ifndef _LRU_LIST_H
 #define _LRU_LIST_H
 
-#include <linux/list.h>
+#include <linux/list_lru_types.h>
 #include <linux/nodemask.h>
 #include <linux/shrinker.h>
 
-#ifdef CONFIG_MEMCG_KMEM
-#include <linux/xarray_types.h>
-#endif
-
 struct mem_cgroup;
 
 /* list_lru_walk_cb has to always return one of those */
@@ -29,36 +25,6 @@ enum lru_status {
 				   internally, but has to return locked. */
 };
 
-struct list_lru_one {
-	struct list_head	list;
-	/* may become negative during memcg reparenting */
-	long			nr_items;
-};
-
-struct list_lru_memcg {
-	struct rcu_head		rcu;
-	/* array of per cgroup per node lists, indexed by node id */
-	struct list_lru_one	node[];
-};
-
-struct list_lru_node {
-	/* protects all lists on the node, including per cgroup */
-	spinlock_t		lock;
-	/* global list, used for the root cgroup in cgroup aware lrus */
-	struct list_lru_one	lru;
-	long			nr_items;
-} ____cacheline_aligned_in_smp;
-
-struct list_lru {
-	struct list_lru_node	*node;
-#ifdef CONFIG_MEMCG_KMEM
-	struct list_head	list;
-	int			shrinker_id;
-	bool			memcg_aware;
-	struct xarray		xa;
-#endif
-};
-
 void list_lru_destroy(struct list_lru *lru);
 int __list_lru_init(struct list_lru *lru, bool memcg_aware,
 		    struct lock_class_key *key, struct shrinker *shrinker);
diff --git a/include/linux/list_lru_types.h b/include/linux/list_lru_types.h
new file mode 100644
index 000000000000..51ccef0d6994
--- /dev/null
+++ b/include/linux/list_lru_types.h
@@ -0,0 +1,42 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LRU_LIST_TYPES_H
+#define _LRU_LIST_TYPES_H
+
+#include <linux/list.h>
+
+#ifdef CONFIG_MEMCG_KMEM
+#include <linux/types.h> // for bool
+#include <linux/xarray_types.h>
+#endif
+
+struct list_lru_one {
+	struct list_head	list;
+	/* may become negative during memcg reparenting */
+	long			nr_items;
+};
+
+struct list_lru_memcg {
+	struct rcu_head		rcu;
+	/* array of per cgroup per node lists, indexed by node id */
+	struct list_lru_one	node[];
+};
+
+struct list_lru_node {
+	/* protects all lists on the node, including per cgroup */
+	spinlock_t		lock;
+	/* global list, used for the root cgroup in cgroup aware lrus */
+	struct list_lru_one	lru;
+	long			nr_items;
+} ____cacheline_aligned_in_smp;
+
+struct list_lru {
+	struct list_lru_node	*node;
+#ifdef CONFIG_MEMCG_KMEM
+	struct list_head	list;
+	int			shrinker_id;
+	bool			memcg_aware;
+	struct xarray		xa;
+#endif
+};
+
+#endif /* _LRU_LIST_TYPES_H */
-- 
2.39.2