Messages in this thread Patch in this message | | | From | Ulrich Obergfell <> | Subject | [PATCH 1/4] watchdog: introduce watchdog_park_threads() and watchdog_unpark_threads() | Date | Sat, 1 Aug 2015 14:49:22 +0200 |
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These functions are intended to be used only from inside kernel/watchdog.c to park/unpark all watchdog threads that are specified in watchdog_cpumask.
Signed-off-by: Ulrich Obergfell <uobergfe@redhat.com> --- kernel/watchdog.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+)
diff --git a/kernel/watchdog.c b/kernel/watchdog.c index a6ffa43..5571f20 100644 --- a/kernel/watchdog.c +++ b/kernel/watchdog.c @@ -24,6 +24,7 @@ #include <asm/irq_regs.h> #include <linux/kvm_para.h> #include <linux/perf_event.h> +#include <linux/kthread.h> /* * The run state of the lockup detectors is controlled by the content of the @@ -666,6 +667,41 @@ static struct smp_hotplug_thread watchdog_threads = { .unpark = watchdog_enable, }; +/* + * park all watchdog threads that are specified in 'watchdog_cpumask' + */ +static int watchdog_park_threads(void) +{ + int cpu, ret = 0; + + get_online_cpus(); + for_each_watchdog_cpu(cpu) { + ret = kthread_park(per_cpu(softlockup_watchdog, cpu)); + if (ret) + break; + } + if (ret) { + for_each_watchdog_cpu(cpu) + kthread_unpark(per_cpu(softlockup_watchdog, cpu)); + } + put_online_cpus(); + + return ret; +} + +/* + * unpark all watchdog threads that are specified in 'watchdog_cpumask' + */ +static void watchdog_unpark_threads(void) +{ + int cpu; + + get_online_cpus(); + for_each_watchdog_cpu(cpu) + kthread_unpark(per_cpu(softlockup_watchdog, cpu)); + put_online_cpus(); +} + static void restart_watchdog_hrtimer(void *info) { struct hrtimer *hrtimer = raw_cpu_ptr(&watchdog_hrtimer); -- 1.7.11.7
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