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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 <eranian@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: bp@alien8.de
Cc: jolsa@redhat.com
Cc: kan.liang@intel.com
Cc: maria.n.dimakopoulou@gmail.com
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/1416251225-17721-12-git-send-email-eranian@google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Stephane Eranian 2014-11-17 20:07:03 +01:00 committed by Ingo Molnar
parent c02cdbf60b
commit b3738d2932
2 changed files with 36 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

8
include/linux/watchdog.h
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 */

28
kernel/watchdog.c
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 = {