Messages in this thread | | | Date | Mon, 15 Apr 2013 11:43:15 +0800 | From | Li Zefan <> | Subject | Re: [PATCH 4/4] cgroup: implement task_cgroup_path_from_hierarchy() |
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> +int task_cgroup_path_from_hierarchy(struct task_struct *task, int hierarchy_id, > + char *buf, size_t buflen) > +{ > + struct cgroupfs_root *root; > + struct cgroup *cgrp = NULL; > + int ret = -ENOENT; > + > + mutex_lock(&cgroup_mutex); > + > + root = idr_find(&cgroup_hierarchy_idr, hierarchy_id); > + if (root) { > + cgrp = task_cgroup_from_root(task, root);
task_cgroup_from_root() will never return NULL, and there's a BUG_ON(!res) in it.
> + if (cgrp) > + ret = cgroup_path(cgrp, buf, buflen); > + } > + > + mutex_unlock(&cgroup_mutex); > + > + return ret; > +} > +EXPORT_SYMBOL_GPL(task_cgroup_path_from_hierarchy);
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