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cgroup: Fix an RCU warning in alloc_css_id()
With CONFIG_PROVE_RCU=y, a warning can be triggered: # mount -t cgroup -o memory xxx /mnt # mkdir /mnt/0 ... kernel/cgroup.c:4442 invoked rcu_dereference_check() without protection! ... This is a false-positive. It's safe to directly access parent_css->id. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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1 changed files with 2 additions and 2 deletions
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@ -4561,13 +4561,13 @@ static int alloc_css_id(struct cgroup_subsys *ss, struct cgroup *parent,
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{
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int subsys_id, i, depth = 0;
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struct cgroup_subsys_state *parent_css, *child_css;
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struct css_id *child_id, *parent_id = NULL;
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struct css_id *child_id, *parent_id;
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subsys_id = ss->subsys_id;
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parent_css = parent->subsys[subsys_id];
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child_css = child->subsys[subsys_id];
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depth = css_depth(parent_css) + 1;
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parent_id = parent_css->id;
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depth = parent_id->depth;
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child_id = get_new_cssid(ss, depth);
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if (IS_ERR(child_id))
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