[RFC][for -mm] memory controller enhancements for reclaiming take2 [2/8] add BUG_ON() in mem_cgroup_zoneinfo

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>]

This should be BUG_ON(). I misunderstood initialization path.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>

 mm/memcontrol.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

Index: linux-2.6.24-rc3-mm2/mm/memcontrol.c
===================================================================
--- linux-2.6.24-rc3-mm2.orig/mm/memcontrol.c
+++ linux-2.6.24-rc3-mm2/mm/memcontrol.c
@@ -206,8 +206,7 @@ static void mem_cgroup_charge_statistics
 static inline struct mem_cgroup_per_zone *
 mem_cgroup_zoneinfo(struct mem_cgroup *mem, int nid, int zid)
 {
-	if (!mem->info.nodeinfo[nid])
-		return NULL;
+	BUG_ON(!mem->info.nodeinfo[nid]);
 	return &mem->info.nodeinfo[nid]->zoneinfo[zid];
 }
 

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