diff options
| -rw-r--r-- | include/linux/nmi.h | 5 | ||||
| -rw-r--r-- | kernel/watchdog.c | 19 | ||||
| -rw-r--r-- | kernel/watchdog_perf.c | 19 |
3 files changed, 22 insertions, 21 deletions
diff --git a/include/linux/nmi.h b/include/linux/nmi.h index 521bf2ee6eff..56fdc3de6894 100644 --- a/include/linux/nmi.h +++ b/include/linux/nmi.h @@ -88,7 +88,10 @@ static inline void hardlockup_detector_disable(void) {} #endif #if defined(CONFIG_HARDLOCKUP_DETECTOR_PERF) +void arch_touch_nmi_watchdog(void); void watchdog_hardlockup_check(unsigned int cpu, struct pt_regs *regs); +#elif !defined(CONFIG_HAVE_NMI_WATCHDOG) +static inline void arch_touch_nmi_watchdog(void) { } #endif #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR) @@ -98,7 +101,6 @@ void watchdog_hardlockup_check(unsigned int cpu, struct pt_regs *regs); #endif #if defined(CONFIG_HARDLOCKUP_DETECTOR_PERF) -extern void arch_touch_nmi_watchdog(void); extern void hardlockup_detector_perf_stop(void); extern void hardlockup_detector_perf_restart(void); extern void hardlockup_detector_perf_disable(void); @@ -113,7 +115,6 @@ static inline void hardlockup_detector_perf_enable(void) { } static inline void hardlockup_detector_perf_cleanup(void) { } # if !defined(CONFIG_HAVE_NMI_WATCHDOG) static inline int hardlockup_detector_perf_init(void) { return -ENODEV; } -static inline void arch_touch_nmi_watchdog(void) {} # else static inline int hardlockup_detector_perf_init(void) { return 0; } # endif diff --git a/kernel/watchdog.c b/kernel/watchdog.c index 2552e224f76a..64d7d2a0a7df 100644 --- a/kernel/watchdog.c +++ b/kernel/watchdog.c @@ -90,8 +90,22 @@ __setup("nmi_watchdog=", hardlockup_panic_setup); static DEFINE_PER_CPU(atomic_t, hrtimer_interrupts); static DEFINE_PER_CPU(int, hrtimer_interrupts_saved); static DEFINE_PER_CPU(bool, watchdog_hardlockup_warned); +static DEFINE_PER_CPU(bool, watchdog_hardlockup_touched); static unsigned long watchdog_hardlockup_all_cpu_dumped; +notrace void arch_touch_nmi_watchdog(void) +{ + /* + * Using __raw here because some code paths have + * preemption enabled. If preemption is enabled + * then interrupts should be enabled too, in which + * case we shouldn't have to worry about the watchdog + * going off. + */ + raw_cpu_write(watchdog_hardlockup_touched, true); +} +EXPORT_SYMBOL(arch_touch_nmi_watchdog); + static bool is_hardlockup(unsigned int cpu) { int hrint = atomic_read(&per_cpu(hrtimer_interrupts, cpu)); @@ -116,6 +130,11 @@ static void watchdog_hardlockup_kick(void) void watchdog_hardlockup_check(unsigned int cpu, struct pt_regs *regs) { + if (per_cpu(watchdog_hardlockup_touched, cpu)) { + per_cpu(watchdog_hardlockup_touched, cpu) = false; + return; + } + /* * Check for a hardlockup by making sure the CPU's timer * interrupt is incrementing. The timer interrupt should have diff --git a/kernel/watchdog_perf.c b/kernel/watchdog_perf.c index 4e60e8023515..547917ebd5d3 100644 --- a/kernel/watchdog_perf.c +++ b/kernel/watchdog_perf.c @@ -20,26 +20,12 @@ #include <asm/irq_regs.h> #include <linux/perf_event.h> -static DEFINE_PER_CPU(bool, watchdog_nmi_touch); static DEFINE_PER_CPU(struct perf_event *, watchdog_ev); static DEFINE_PER_CPU(struct perf_event *, dead_event); static struct cpumask dead_events_mask; static atomic_t watchdog_cpus = ATOMIC_INIT(0); -notrace void arch_touch_nmi_watchdog(void) -{ - /* - * Using __raw here because some code paths have - * preemption enabled. If preemption is enabled - * then interrupts should be enabled too, in which - * case we shouldn't have to worry about the watchdog - * going off. - */ - raw_cpu_write(watchdog_nmi_touch, true); -} -EXPORT_SYMBOL(arch_touch_nmi_watchdog); - #ifdef CONFIG_HARDLOCKUP_CHECK_TIMESTAMP static DEFINE_PER_CPU(ktime_t, last_timestamp); static DEFINE_PER_CPU(unsigned int, nmi_rearmed); @@ -115,11 +101,6 @@ static void watchdog_overflow_callback(struct perf_event *event, if (!watchdog_check_timestamp()) return; - if (__this_cpu_read(watchdog_nmi_touch) == true) { - __this_cpu_write(watchdog_nmi_touch, false); - return; - } - watchdog_hardlockup_check(smp_processor_id(), regs); } |