On Sun, Apr 14, 2013 at 08:46:13PM -0700, Tejun Heo wrote:
> On Mon, Apr 15, 2013 at 11:43:15AM +0800, Li Zefan wrote:
> > > +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.
>
> @hierarchy_id may come from userland, so we probably should update
> task_cgroup_from_root() to return NULL if the id is invalid. Will add
> a patch.
For some reason, I thought you were talking about hierarchy lookup.
Yeap, task_cgroup_from_root() can't be NULL for a valid hierarchy.
Will drop the if.
--
tejun
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