[PATCH] memcg remove warning at DEBUG_VM=off

[KAMEZAWA Hiroyuki]

From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
This is against 2.6.30-rc1. (maybe no problem against mmotm.)

==
Fix warning as

  CC      mm/memcontrol.o
mm/memcontrol.c:318: warning: ‘mem_cgroup_is_obsolete’ defined but not used

This is called only from VM_BUG_ON().

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
---
Index: linux-2.6.30-rc1/mm/memcontrol.c
===================================================================
--- linux-2.6.30-rc1.orig/mm/memcontrol.c
+++ linux-2.6.30-rc1/mm/memcontrol.c
@@ -314,13 +314,14 @@ static struct mem_cgroup *try_get_mem_cg
 	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
 
 /*
  * Call callback function against all cgroup under hierarchy tree.

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