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authorJohannes Weiner <hannes@cmpxchg.org>2011-03-23 16:42:24 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-03-23 19:46:25 -0700
commitaf4a662144884a7dbb19acbef70878b3b955f928 (patch)
treef16b04ed13de1ad1938af551e406879b90d4b0ca
parentc14f35c70e068392ccae0b2d6f755baea5eed4d6 (diff)
downloadop-kernel-dev-af4a662144884a7dbb19acbef70878b3b955f928.zip
op-kernel-dev-af4a662144884a7dbb19acbef70878b3b955f928.tar.gz
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.c5
1 files changed, 1 insertions, 4 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index b94cd24..3a2d54b 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)
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