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cgroup: make cgroup_task_iter remember the cgroup being iterated

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Currently all cgroup_task_iter functions require @cgrp to be passed
in, which is superflous and increases chance of usage error.  Make
cgroup_task_iter remember the cgroup being iterated and drop @cgrp
argument from next and end functions.

This patch doesn't introduce any behavior differences.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Matt Helsley <matthltc@us.ibm.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Balbir Singh <bsingharora@gmail.com>
This commit is contained in:
Tejun Heo
2013-08-08 20:11:26 -04:00
parent 0942eeeef6
commit c59cd3d840
4 changed files with 27 additions and 29 deletions
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6
include/linux/cgroup.h
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@@ -891,14 +891,14 @@ css_next_descendant_post(struct cgroup_subsys_state *pos,
/* A cgroup_task_iter should be treated as an opaque object */
struct cgroup_task_iter {
struct cgroup *origin_cgrp;
struct list_head *cset_link;
struct list_head *task;
};
void cgroup_task_iter_start(struct cgroup *cgrp, struct cgroup_task_iter *it);
struct task_struct *cgroup_task_iter_next(struct cgroup *cgrp,
struct cgroup_task_iter *it);
void cgroup_task_iter_end(struct cgroup *cgrp, struct cgroup_task_iter *it);
struct task_struct *cgroup_task_iter_next(struct cgroup_task_iter *it);
void cgroup_task_iter_end(struct cgroup_task_iter *it);
int cgroup_scan_tasks(struct cgroup_scanner *scan);
int cgroup_attach_task_all(struct task_struct *from, struct task_struct *);
int cgroup_transfer_tasks(struct cgroup *to, struct cgroup *from);