| Date | Wed, 3 Dec 2008 13:58:42 +0900 | From | KAMEZAWA Hiroyuki <> | Subject | [PATCH 10/21] memcg-add-null-check-to-page_cgroup_zoneinfo.patch |
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if CONFIG_CGROUP_MEM_RES_CTLR_SWAP=y, page_cgroup::mem_cgroup can be NULL. Therefore null checking is better.
latter patch use this function.
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Rik van Riel <riel@redhat.com> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> mm/memcontrol.c | 3 +++ 1 file changed, 3 insertions(+)
Index: mmotm-2.6.28-Dec02/mm/memcontrol.c =================================================================== --- mmotm-2.6.28-Dec02.orig/mm/memcontrol.c +++ mmotm-2.6.28-Dec02/mm/memcontrol.c @@ -231,6 +231,9 @@ page_cgroup_zoneinfo(struct page_cgroup int nid = page_cgroup_nid(pc); int zid = page_cgroup_zid(pc); + if (!mem) + return NULL; + return mem_cgroup_zoneinfo(mem, nid, zid); }
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