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cgroup: remove cgroup->count and use

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cgroup->count tracks the number of css_sets associated with the cgroup
and used only to verify that no css_set is associated when the cgroup
is being destroyed.  It's superflous as the destruction path can
simply check whether cgroup->cset_links is empty instead.

Drop cgroup->count and check ->cset_links directly from
cgroup_destroy_locked().

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
This commit is contained in:
Tejun Heo 2013-06-12 21:04:55 -07:00
parent ddd69148bd
commit 6f3d828f0f
2 changed files with 5 additions and 22 deletions
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6
include/linux/cgroup.h
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@ -169,12 +169,6 @@ struct cgroup_name {
struct cgroup {
unsigned long flags; /* "unsigned long" so bitops work */
/*
* count users of this cgroup. >0 means busy, but doesn't
* necessarily indicate the number of tasks in the cgroup
*/
atomic_t count;
int id; /* ida allocated in-hierarchy ID */
/*