mm: __count_immobile_pages(): make sure the node is online
commit656a070629adfe23c12768e35ddf91feab469ff7
authorMichal Hocko <mhocko@suse.cz>
Fri, 20 Jan 2012 22:33:58 +0000 (20 14:33 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Mon, 23 Jan 2012 16:38:47 +0000 (23 08:38 -0800)
tree42c001d079ec926186873b91d7d84bf66c54bcad
parent687875fb7de4a95223af20ee024282fa9099f860
mm: __count_immobile_pages(): make sure the node is online

page_zone() requires an online node otherwise we are accessing NULL
NODE_DATA.  This is not an issue at the moment because node_zones are
located at the structure beginning but this might change in the future
so better be careful about that.

Signed-off-by: Michal Hocko <mhocko@suse.cz>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/page_alloc.c