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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 authored and Ingo Molnar committed 2015-04-02 17:33:15 +02:00
1 parent c02cdbf60b
commit b3738d2932
2 files changed
+36
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include/linux/watchdog.h
+8
View File
@@ -137,4 +137,12 @@ extern int watchdog_init_timeout(struct watchdog_device *wdd,
extern int watchdog_register_device(struct watchdog_device *);
extern void watchdog_unregister_device(struct watchdog_device *);
#ifdef CONFIG_HARDLOCKUP_DETECTOR
void watchdog_nmi_disable_all(void);
void watchdog_nmi_enable_all(void);
#else
static inline void watchdog_nmi_disable_all(void) {}
static inline void watchdog_nmi_enable_all(void) {}
#endif
#endif /* ifndef _LINUX_WATCHDOG_H */
kernel/watchdog.c
+28
View File
@@ -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 = {