[PATCH] memcg: use ifdef for mem_cgroup_is_obsolete()

[Pekka J Enberg]

From: Pekka Enberg <penberg@xxxxxxxxxxxxxx>

When CONFIG_DEBUG_VM is disabled, I get the following warning:

    CC      mm/memcontrol.o
  mm/memcontrol.c:318: warning: â??mem_cgroup_is_obsoleteâ?? defined but not
  used

Fix that up by wrapping mem_cgroup_is_obsolete() in an ifdef.

Signed-off-by: Pekka Enberg <penberg@xxxxxxxxxxxxxx>
---
 mm/memcontrol.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 01c2d8f..51f2dbd 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -314,12 +314,14 @@ static struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm)
 	return mem;
 }
 
+#ifdef CONFIG_DEBUG_VM
 static bool mem_cgroup_is_obsolete(struct mem_cgroup *mem)
 {
 	if (!mem)
 		return true;
 	return css_is_removed(&mem->css);
 }
+#endif
 
 
 /*
-- 
1.5.6.3