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cgroup: add comment to cgroup_enable_threaded()

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Explain cgroup_enable_threaded() and note that the function can never
be called on the root cgroup.

Signed-off-by: Tejun Heo <tj@kernel.org>
Suggested-by: Waiman Long <longman@redhat.com>
This commit is contained in:
Tejun Heo 2017-07-25 13:20:18 -04:00
parent 918a8c2c4e
commit c705a00d77
1 changed files with 9 additions and 0 deletions
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kernel/cgroup/cgroup.c
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@ -3129,6 +3129,15 @@ static ssize_t cgroup_subtree_control_write(struct kernfs_open_file *of,
return ret ?: nbytes;
}
/**
* cgroup_enable_threaded - make @cgrp threaded
* @cgrp: the target cgroup
*
* Called when "threaded" is written to the cgroup.type interface file and
* tries to make @cgrp threaded and join the parent's resource domain.
* This function is never called on the root cgroup as cgroup.type doesn't
* exist on it.
*/
static int cgroup_enable_threaded(struct cgroup *cgrp)
{
struct cgroup *parent = cgroup_parent(cgrp);