]> git.proxmox.com Git - mirror_ubuntu-disco-kernel.git/commit
kernel: cgroup: push rcu read locking from css_is_ancestor() to callsite
authorJohannes Weiner <hannes@cmpxchg.org>
Tue, 29 May 2012 22:06:24 +0000 (15:06 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 29 May 2012 23:22:20 +0000 (16:22 -0700)
commit91c63734f6908425903aed69c04035592f18d398
tree6790827ab915b17c63d5c39d8c72c47f3764f868
parent0ce72d4f7333248efbef1f3309770c7edb1b2625
kernel: cgroup: push rcu read locking from css_is_ancestor() to callsite

Library functions should not grab locks when the callsites can do it,
even if the lock nests like the rcu read-side lock does.

Push the rcu_read_lock() from css_is_ancestor() to its single user,
mem_cgroup_same_or_subtree() in preparation for another user that may
already hold the rcu read-side lock.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Konstantin Khlebnikov <khlebnikov@openvz.org>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Acked-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
kernel/cgroup.c
mm/memcontrol.c