Re: [PATCH 4/4] cgroup: implement task_cgroup_path_from_hierarchy()

[Tejun Heo]

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.

Thanks.

-- 
tejun
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/