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tracing: Fix user stack trace "??" output
[sfrench/cifs-2.6.git]
/
Documentation
/
clearing-warn-once.txt
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Clearing WARN_ONCE
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------------------
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WARN_ONCE / WARN_ON_ONCE / printk_once only emit a message once.
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echo 1 > /sys/kernel/debug/clear_warn_once
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clears the state and allows the warnings to print once again.
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This can be useful after test suite runs to reproduce problems.