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+.. SPDX-License-Identifier: GPL-2.0
+
+.. include:: ../disclaimer-zh_TW.rst
+
+:Translator: 胡皓文 Hu Haowen <src.res@email.cn>
+
+清除 WARN_ONCE
+--------------
+
+WARN_ONCE / WARN_ON_ONCE / printk_once 僅僅列印一次消息.
+
+echo 1 > /sys/kernel/debug/clear_warn_once
+
+可以清除這種狀態並且再次允許列印一次告警信息,這對於運行測試集後重現問題
+很有用。
+