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由 Yihao Wu 提交于
to #29558346 rcu variable can be NULL inside rcu lock region, if rcu_read_lock is called in grace period. So check if (!variable) before dereference it. Signed-off-by: NYihao Wu <wuyihao@linux.alibaba.com> Acked-by: NShanpei Chen <shanpeic@linux.alibaba.com>
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