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| author | KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> | 2010-05-11 14:06:59 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-05-11 17:33:42 -0700 |
| commit | 747388d78a0ae768fd82b55c4ed38aa646a72364 (patch) | |
| tree | 03efabf9761209cffef4e8da9b6989887f76428e /drivers/video/bfin-t350mcqb-fb.c | |
| parent | 7f0f15464185a92f9d8791ad231bcd7bf6df54e4 (diff) | |
| download | lwn-747388d78a0ae768fd82b55c4ed38aa646a72364.tar.gz lwn-747388d78a0ae768fd82b55c4ed38aa646a72364.zip | |
memcg: fix css_is_ancestor() RCU locking
Some callers (in memcontrol.c) calls css_is_ancestor() without
rcu_read_lock. Because css_is_ancestor() has to access RCU protected
data, it should be under rcu_read_lock().
This makes css_is_ancestor() itself does safe access to RCU protected
area. (At least, "root" can have refcnt==0 if it's not an ancestor of
"child". So, we need rcu_read_lock().)
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/video/bfin-t350mcqb-fb.c')
0 files changed, 0 insertions, 0 deletions