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watchdog: Add watchdog enable/disable all functions

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This patch adds two new functions to enable/disable
the watchdog across all CPUs.

This will be used by the HT PMU bug workaround code to
disable/enable the NMI watchdog across quirk enablement.

Signed-off-by: Stephane Eranian <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: Frederic Weisbecker <[email protected]>
Cc: Don Zickus <[email protected]>
Cc: Andrew Morton <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Stephane Eranian 2014-11-17 20:07:03 +01:00 • committed by Ingo Molnar
commit b3738d2932
2 changed files with 36 additions and 0 deletions
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28
kernel/watchdog.c
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@ -567,9 +567,37 @@ static void watchdog_nmi_disable(unsigned int cpu)
cpu0_err = 0;
}
}
void watchdog_nmi_enable_all(void)
{
int cpu;
if (!watchdog_user_enabled)
return;
get_online_cpus();
for_each_online_cpu(cpu)
watchdog_nmi_enable(cpu);
put_online_cpus();
}
void watchdog_nmi_disable_all(void)
{
int cpu;
if (!watchdog_running)
return;
get_online_cpus();
for_each_online_cpu(cpu)
watchdog_nmi_disable(cpu);
put_online_cpus();
}
#else
static int watchdog_nmi_enable(unsigned int cpu) { return 0; }
static void watchdog_nmi_disable(unsigned int cpu) { return; }
void watchdog_nmi_enable_all(void) {}
void watchdog_nmi_disable_all(void) {}
#endif /* CONFIG_HARDLOCKUP_DETECTOR */
static struct smp_hotplug_thread watchdog_threads = {