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da0d12ff2b
The change adds panic watchdog pretimeout governor, on watchdog pretimeout event the kernel shall panic. In general watchdog pretimeout event means that something essentially bad is going on the system, for example a process scheduler stalls or watchdog feeder is killed due to OOM, so printing out information attendant to panic and before likely unavoidable reboot caused by a watchdog may help to determine a root cause of the issue. Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
48 lines
1.2 KiB
C
48 lines
1.2 KiB
C
/*
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* Copyright (C) 2015-2016 Mentor Graphics
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/watchdog.h>
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#include "watchdog_pretimeout.h"
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/**
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* pretimeout_panic - Panic on watchdog pretimeout event
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* @wdd - watchdog_device
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*
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* Panic, watchdog has not been fed till pretimeout event.
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*/
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static void pretimeout_panic(struct watchdog_device *wdd)
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{
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panic("watchdog pretimeout event\n");
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}
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static struct watchdog_governor watchdog_gov_panic = {
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.name = "panic",
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.pretimeout = pretimeout_panic,
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};
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static int __init watchdog_gov_panic_register(void)
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{
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return watchdog_register_governor(&watchdog_gov_panic);
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}
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static void __exit watchdog_gov_panic_unregister(void)
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{
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watchdog_unregister_governor(&watchdog_gov_panic);
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}
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module_init(watchdog_gov_panic_register);
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module_exit(watchdog_gov_panic_unregister);
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MODULE_AUTHOR("Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>");
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MODULE_DESCRIPTION("Panic watchdog pretimeout governor");
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MODULE_LICENSE("GPL");
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