Commit 33278f7f authored May 26, 2011 by Namhyung Kim Committed by Linus Torvalds May 26, 2011

memcg: fix off-by-one when calculating swap cgroup map length



It allocated one more page than necessary if @max_pages was a multiple of
SC_PER_PAGE.

Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 268433b8

mm/page_cgroup.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -475,7 +475,7 @@ int swap_cgroup_swapon(int type, unsigned long max_pages)
		if (!do_swap_account)
		return 0;

		length = ((max_pages/SC_PER_PAGE) + 1);
		length = DIV_ROUND_UP(max_pages, SC_PER_PAGE);
		array_size = length * sizeof(void *);

		array = vmalloc(array_size);