[RFC PATCH bpf-next 09/10] bpf: Make bpf_map_{save, release}_memcg public

[Yafang Shao <laoar.shao@gmail.com>]

These two helpers will be used in map specific files later.

Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
---
 include/linux/bpf.h  | 21 +++++++++++++++++++++
 kernel/bpf/syscall.c | 19 -------------------
 2 files changed, 21 insertions(+), 19 deletions(-)

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index b18a30e70507..a0f21d4382ff 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -27,6 +27,7 @@
 #include <linux/bpfptr.h>
 #include <linux/btf.h>
 #include <linux/rcupdate_trace.h>
+#include <linux/memcontrol.h>
 
 struct bpf_verifier_env;
 struct bpf_verifier_log;
@@ -248,6 +249,26 @@ struct bpf_map {
 	bool frozen; /* write-once; write-protected by freeze_mutex */
 };
 
+#ifdef CONFIG_MEMCG_KMEM
+static inline void bpf_map_save_memcg(struct bpf_map *map)
+{
+	map->memcg = get_mem_cgroup_from_mm(current->mm);
+}
+
+static inline void bpf_map_release_memcg(struct bpf_map *map)
+{
+	mem_cgroup_put(map->memcg);
+}
+#else
+static inline void bpf_map_save_memcg(struct bpf_map *map)
+{
+}
+
+static inline void bpf_map_release_memcg(struct bpf_map *map)
+{
+}
+#endif
+
 static inline bool map_value_has_spin_lock(const struct bpf_map *map)
 {
 	return map->spin_lock_off >= 0;
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 8817c40275f3..5159b97d1064 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -417,16 +417,6 @@ void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock)
 }
 
 #ifdef CONFIG_MEMCG_KMEM
-static void bpf_map_save_memcg(struct bpf_map *map)
-{
-	map->memcg = get_mem_cgroup_from_mm(current->mm);
-}
-
-static void bpf_map_release_memcg(struct bpf_map *map)
-{
-	mem_cgroup_put(map->memcg);
-}
-
 void *bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
 			   int node)
 {
@@ -464,15 +454,6 @@ void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size,
 
 	return ptr;
 }
-
-#else
-static void bpf_map_save_memcg(struct bpf_map *map)
-{
-}
-
-static void bpf_map_release_memcg(struct bpf_map *map)
-{
-}
 #endif
 
 static int bpf_map_kptr_off_cmp(const void *a, const void *b)
-- 
2.17.1