/* * Copyright (C) 2015-2016 Mentor Graphics * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * */ #include #include #include #include "watchdog_pretimeout.h" /** * pretimeout_noop - No operation on watchdog pretimeout event * @wdd - watchdog_device * * This function prints a message about pretimeout to kernel log. */ static void pretimeout_noop(struct watchdog_device *wdd) { pr_alert("watchdog%d: pretimeout event\n", wdd->id); } static struct watchdog_governor watchdog_gov_noop = { .name = "noop", .pretimeout = pretimeout_noop, }; static int __init watchdog_gov_noop_register(void) { return watchdog_register_governor(&watchdog_gov_noop); } static void __exit watchdog_gov_noop_unregister(void) { watchdog_unregister_governor(&watchdog_gov_noop); } module_init(watchdog_gov_noop_register); module_exit(watchdog_gov_noop_unregister); MODULE_AUTHOR("Vladimir Zapolskiy "); MODULE_DESCRIPTION("Panic watchdog pretimeout governor"); MODULE_LICENSE("GPL"); '>packet-loop-back net-next plumbingsTobias Klauser
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authorThomas Gleixner <tglx@linutronix.de>2017-01-31 09:37:34 +0100
committerThomas Gleixner <tglx@linutronix.de>2017-01-31 21:47:58 +0100
commit0becc0ae5b42828785b589f686725ff5bc3b9b25 (patch)
treebe6d0e1f37c38ed0a7dd5da2d4b1e93f0fb43101 /net/batman-adv/bitarray.c
parent24c2503255d35c269b67162c397a1a1c1e02f6ce (diff)
x86/mce: Make timer handling more robust
Erik reported that on a preproduction hardware a CMCI storm triggers the BUG_ON in add_timer_on(). The reason is that the per CPU MCE timer is started by the CMCI logic before the MCE CPU hotplug callback starts the timer with add_timer_on(). So the timer is already queued which triggers the BUG. Using add_timer_on() is pretty pointless in this code because the timer is strictlty per CPU, initialized as pinned and all operations which arm the timer happen on the CPU to which the timer belongs. Simplify the whole machinery by using mod_timer() instead of add_timer_on() which avoids the problem because mod_timer() can handle already queued timers. Use __start_timer() everywhere so the earliest armed expiry time is preserved. Reported-by: Erik Veijola <erik.veijola@intel.com> Tested-by: Borislav Petkov <bp@alien8.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Borislav Petkov <bp@alien8.de> Cc: Tony Luck <tony.luck@intel.com> Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1701310936080.3457@nanos Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'net/batman-adv/bitarray.c')