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cgroup: always use cgroup_next_child() to walk the children list

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There are several places where the children list is accessed directly.
This patch converts those places to use cgroup_next_child().  This
will help updating the hierarchy iterators to use @css instead of
@cgrp.

While cgroup_next_child() can be heavy in pathological cases - e.g. a
lot of dead children, this shouldn't cause any noticeable behavior
differences.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
This commit is contained in:
Tejun Heo 2013-08-08 20:11:24 -04:00
commit f48e3924dc
2 changed files with 5 additions and 7 deletions
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5
include/linux/cgroup.h
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@ -800,9 +800,8 @@ struct cgroup *cgroup_next_child(struct cgroup *pos, struct cgroup *cgrp);
* the start of the next iteration by, for example, bumping the css refcnt.
*/
#define cgroup_for_each_child(pos, cgrp) \
for ((pos) = list_first_or_null_rcu(&(cgrp)->children, \
struct cgroup, sibling); \
(pos); (pos) = cgroup_next_child((pos), (cgrp)))
for ((pos) = cgroup_next_child(NULL, (cgrp)); (pos); \
(pos) = cgroup_next_child((pos), (cgrp)))
struct cgroup *cgroup_next_descendant_pre(struct cgroup *pos,
struct cgroup *cgroup);