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| author | Namhyung Kim <namhyung@gmail.com> | 2011-05-26 16:25:30 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-26 17:12:35 -0700 |
| commit | 33278f7f0a9e5a9b29f59e07b7e3182d27769ac2 (patch) | |
| tree | 8de853c293856cc227d703ffaa0e12410efa1fcd /mm/page_cgroup.c | |
| parent | 268433b8e54486b12478e94ba18587bcc7de4d57 (diff) | |
| download | lwn-33278f7f0a9e5a9b29f59e07b7e3182d27769ac2.tar.gz lwn-33278f7f0a9e5a9b29f59e07b7e3182d27769ac2.zip | |
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>
Diffstat (limited to 'mm/page_cgroup.c')
| -rw-r--r-- | mm/page_cgroup.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/page_cgroup.c b/mm/page_cgroup.c index 4eb05302e2e1..5524e8bd7437 100644 --- a/mm/page_cgroup.c +++ b/mm/page_cgroup.c @@ -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); |