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| author | Johannes Weiner <hannes@cmpxchg.org> | 2011-03-23 16:42:24 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-03-23 19:46:25 -0700 |
| commit | af4a662144884a7dbb19acbef70878b3b955f928 (patch) | |
| tree | f16b04ed13de1ad1938af551e406879b90d4b0ca | |
| parent | c14f35c70e068392ccae0b2d6f755baea5eed4d6 (diff) | |
| download | linux-af4a662144884a7dbb19acbef70878b3b955f928.tar.bz2 | |
memcg: remove NULL check from lookup_page_cgroup() result
The page_cgroup array is set up before even fork is initialized. I
seriously doubt that this code executes before the array is alloc'd.
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/memcontrol.c | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index b94cd24c5baa..3a2d54bdf076 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -2369,10 +2369,7 @@ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm, } pc = lookup_page_cgroup(page); - /* can happen at boot */ - if (unlikely(!pc)) - return 0; - prefetchw(pc); + BUG_ON(!pc); /* XXX: remove this and move pc lookup into commit */ ret = __mem_cgroup_try_charge(mm, gfp_mask, &mem, oom, page_size); if (ret || !mem) |