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authorKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>2009-01-07 21:08:18 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-08 11:31:07 -0500
commit549927620b04a8f8073ce2ee2a8977f209af2ee5 (patch)
tree6451507892fb353732fe959b2bf0a171fa3ac20b /mm
parenteeee9a8cd1e93c8b94e7788790fa9e2f8910c779 (diff)
memcg: add null check to page_cgroup_zoneinfo()
If CONFIG_CGROUP_MEM_RES_CTLR_SWAP=y, page_cgroup::mem_cgroup can be NULL. Therefore null checking is better. A later patch uses 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> Cc: Balbir Singh <balbir@in.ibm.com> Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Cc: Hugh Dickins <hugh@veritas.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/memcontrol.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 9b4993ee46b3..457d671029b8 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -231,6 +231,9 @@ page_cgroup_zoneinfo(struct page_cgroup *pc)
231 int nid = page_cgroup_nid(pc); 231 int nid = page_cgroup_nid(pc);
232 int zid = page_cgroup_zid(pc); 232 int zid = page_cgroup_zid(pc);
233 233
234 if (!mem)
235 return NULL;
236
234 return mem_cgroup_zoneinfo(mem, nid, zid); 237 return mem_cgroup_zoneinfo(mem, nid, zid);
235} 238}
236 239