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cpuset: fix RCU lockdep splat in cpuset_print_task_mems_allowed()

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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>
This commit is contained in:
Li Zefan 2013-03-12 10:28:39 +08:00 committed by Tejun Heo
parent ff794dea52
commit cfb5966bef
1 changed files with 2 additions and 0 deletions
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2
kernel/cpuset.c
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@ -2599,6 +2599,7 @@ void cpuset_print_task_mems_allowed(struct task_struct *tsk)
struct cgroup *cgrp = task_cs(tsk)->css.cgroup;
rcu_read_lock();
spin_lock(&cpuset_buffer_lock);
nodelist_scnprintf(cpuset_nodelist, CPUSET_NODELIST_LEN,
@ -2607,6 +2608,7 @@ void cpuset_print_task_mems_allowed(struct task_struct *tsk)
tsk->comm, cgroup_name(cgrp), cpuset_nodelist);
spin_unlock(&cpuset_buffer_lock);
rcu_read_unlock();
}
/*