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cgroup: fix RCU related sparse warnings
kn->priv which is a void * is used as a RCU pointer by cgroup. When dereferencing it, it was passing kn->priv to rcu_derefreence() without casting it into a RCU pointer triggering address space mismatch warning from sparse. Fix them. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: Fengguang Wu <fengguang.wu@intel.com> Acked-by: Acked-by: Zefan Li <lizefan@huawei.com>
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kernel/cgroup
@ -694,7 +694,7 @@ int cgroupstats_build(struct cgroupstats *stats, struct dentry *dentry)
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* @kn->priv is RCU safe. Let's do the RCU dancing.
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*/
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rcu_read_lock();
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cgrp = rcu_dereference(kn->priv);
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cgrp = rcu_dereference(*(void __rcu __force **)&kn->priv);
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if (!cgrp || cgroup_is_dead(cgrp)) {
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rcu_read_unlock();
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mutex_unlock(&cgroup_mutex);
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@ -4932,7 +4932,7 @@ struct cgroup_subsys_state *css_tryget_online_from_dir(struct dentry *dentry,
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* have been or be removed at any point. @kn->priv is RCU
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* protected for this access. See css_release_work_fn() for details.
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*/
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cgrp = rcu_dereference(kn->priv);
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cgrp = rcu_dereference(*(void __rcu __force **)&kn->priv);
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if (cgrp)
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css = cgroup_css(cgrp, ss);
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