cpuset: fix RCU lockdep splat in cpuset_print_task_mems_allowed()
Sasha reported a lockdep warning when OOM was triggered. The reason is cgroup_name() should be called with rcu_read_lock() held. Reported-by: Sasha Levin <sasha.levin@oracle.com> Signed-off-by: Li Zefan <lizefan@huawei.com> Signed-off-by: Tejun Heo <tj@kernel.org>
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@ -2599,6 +2599,7 @@ void cpuset_print_task_mems_allowed(struct task_struct *tsk)
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struct cgroup *cgrp = task_cs(tsk)->css.cgroup;
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struct cgroup *cgrp = task_cs(tsk)->css.cgroup;
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rcu_read_lock();
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spin_lock(&cpuset_buffer_lock);
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spin_lock(&cpuset_buffer_lock);
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nodelist_scnprintf(cpuset_nodelist, CPUSET_NODELIST_LEN,
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nodelist_scnprintf(cpuset_nodelist, CPUSET_NODELIST_LEN,
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@ -2607,6 +2608,7 @@ void cpuset_print_task_mems_allowed(struct task_struct *tsk)
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tsk->comm, cgroup_name(cgrp), cpuset_nodelist);
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tsk->comm, cgroup_name(cgrp), cpuset_nodelist);
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spin_unlock(&cpuset_buffer_lock);
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spin_unlock(&cpuset_buffer_lock);
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rcu_read_unlock();
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}
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}
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/*
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/*
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