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f77710c4cd
The change adds noop watchdog pretimeout governor, only an informational message is printed to the kernel log buffer when a watchdog triggers a pretimeout event. While introducing the first pretimeout governor the selected design assumes that the default pretimeout governor is selected by its name and it is always built-in, thus the default pretimeout governor can not be unregistered and the correspondent check can be removed from the watchdog_unregister_governor() function. 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/module.h>
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#include <linux/printk.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_noop - No operation on watchdog pretimeout event
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* @wdd - watchdog_device
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*
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* This function prints a message about pretimeout to kernel log.
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*/
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static void pretimeout_noop(struct watchdog_device *wdd)
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{
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pr_alert("watchdog%d: pretimeout event\n", wdd->id);
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}
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static struct watchdog_governor watchdog_gov_noop = {
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.name = "noop",
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.pretimeout = pretimeout_noop,
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};
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static int __init watchdog_gov_noop_register(void)
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{
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return watchdog_register_governor(&watchdog_gov_noop);
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}
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static void __exit watchdog_gov_noop_unregister(void)
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{
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watchdog_unregister_governor(&watchdog_gov_noop);
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}
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module_init(watchdog_gov_noop_register);
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module_exit(watchdog_gov_noop_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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