[patch -mm] mm: memcg: remote memcg charging for kmem allocations fix

[David Rientjes]

fix build warning for CONFIG_SLOB:

mm/memcontrol.c:706:27: warning: 'get_mem_cgroup' defined but not used [-Wunused-function]
static struct mem_cgroup *get_mem_cgroup(struct mem_cgroup *memcg)

Reported-by: kbuild test robot <lkp@xxxxxxxxx>
Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>
---
 mm/memcontrol.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -701,15 +701,6 @@ struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm)
 	return memcg;
 }
 
-static struct mem_cgroup *get_mem_cgroup(struct mem_cgroup *memcg)
-{
-	rcu_read_lock();
-	if (!css_tryget_online(&memcg->css))
-		memcg = NULL;
-	rcu_read_unlock();
-	return memcg;
-}
-
 /**
  * mem_cgroup_iter - iterate over memory cgroup hierarchy
  * @root: hierarchy root
@@ -2128,6 +2119,15 @@ static void commit_charge(struct page *page, struct mem_cgroup *memcg,
 }
 
 #ifndef CONFIG_SLOB
+static struct mem_cgroup *get_mem_cgroup(struct mem_cgroup *memcg)
+{
+	rcu_read_lock();
+	if (!css_tryget_online(&memcg->css))
+		memcg = NULL;
+	rcu_read_unlock();
+	return memcg;
+}
+
 static int memcg_alloc_cache_id(void)
 {
 	int id, size;