diff options
| -rw-r--r-- | include/linux/nmi.h | 4 | ||||
| -rw-r--r-- | kernel/cpu.c | 5 | ||||
| -rw-r--r-- | kernel/watchdog.c | 25 | ||||
| -rw-r--r-- | kernel/watchdog_perf.c | 28 |
4 files changed, 1 insertions, 61 deletions
diff --git a/include/linux/nmi.h b/include/linux/nmi.h index a8dfb38c9bb6..e78fa535f61d 100644 --- a/include/linux/nmi.h +++ b/include/linux/nmi.h @@ -17,7 +17,6 @@ void lockup_detector_init(void); void lockup_detector_retry_init(void); void lockup_detector_soft_poweroff(void); -void lockup_detector_cleanup(void); extern int watchdog_user_enabled; extern int watchdog_thresh; @@ -37,7 +36,6 @@ extern int sysctl_hardlockup_all_cpu_backtrace; static inline void lockup_detector_init(void) { } static inline void lockup_detector_retry_init(void) { } static inline void lockup_detector_soft_poweroff(void) { } -static inline void lockup_detector_cleanup(void) { } #endif /* !CONFIG_LOCKUP_DETECTOR */ #ifdef CONFIG_SOFTLOCKUP_DETECTOR @@ -104,12 +102,10 @@ void watchdog_hardlockup_check(unsigned int cpu, struct pt_regs *regs); #if defined(CONFIG_HARDLOCKUP_DETECTOR_PERF) extern void hardlockup_detector_perf_stop(void); extern void hardlockup_detector_perf_restart(void); -extern void hardlockup_detector_perf_cleanup(void); extern void hardlockup_config_perf_event(const char *str); #else static inline void hardlockup_detector_perf_stop(void) { } static inline void hardlockup_detector_perf_restart(void) { } -static inline void hardlockup_detector_perf_cleanup(void) { } static inline void hardlockup_config_perf_event(const char *str) { } #endif diff --git a/kernel/cpu.c b/kernel/cpu.c index 07455d25329c..ad755db29efd 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -1453,11 +1453,6 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen, out: cpus_write_unlock(); - /* - * Do post unplug cleanup. This is still protected against - * concurrent CPU hotplug via cpu_add_remove_lock. - */ - lockup_detector_cleanup(); arch_smt_update(); return ret; } diff --git a/kernel/watchdog.c b/kernel/watchdog.c index b2da7de39d06..18156023e461 100644 --- a/kernel/watchdog.c +++ b/kernel/watchdog.c @@ -347,8 +347,6 @@ static int __init watchdog_thresh_setup(char *str) } __setup("watchdog_thresh=", watchdog_thresh_setup); -static void __lockup_detector_cleanup(void); - #ifdef CONFIG_SOFTLOCKUP_DETECTOR_INTR_STORM enum stats_per_group { STATS_SYSTEM, @@ -886,11 +884,6 @@ static void __lockup_detector_reconfigure(void) watchdog_hardlockup_start(); cpus_read_unlock(); - /* - * Must be called outside the cpus locked section to prevent - * recursive locking in the perf code. - */ - __lockup_detector_cleanup(); } void lockup_detector_reconfigure(void) @@ -940,24 +933,6 @@ static inline void lockup_detector_setup(void) } #endif /* !CONFIG_SOFTLOCKUP_DETECTOR */ -static void __lockup_detector_cleanup(void) -{ - lockdep_assert_held(&watchdog_mutex); - hardlockup_detector_perf_cleanup(); -} - -/** - * lockup_detector_cleanup - Cleanup after cpu hotplug or sysctl changes - * - * Caller must not hold the cpu hotplug rwsem. - */ -void lockup_detector_cleanup(void) -{ - mutex_lock(&watchdog_mutex); - __lockup_detector_cleanup(); - mutex_unlock(&watchdog_mutex); -} - /** * lockup_detector_soft_poweroff - Interface to stop lockup detector(s) * diff --git a/kernel/watchdog_perf.c b/kernel/watchdog_perf.c index 59c1d86a73a2..2fdb96eaf493 100644 --- a/kernel/watchdog_perf.c +++ b/kernel/watchdog_perf.c @@ -21,8 +21,6 @@ #include <linux/perf_event.h> 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); @@ -181,37 +179,13 @@ void watchdog_hardlockup_disable(unsigned int cpu) if (event) { perf_event_disable(event); + perf_event_release_kernel(event); this_cpu_write(watchdog_ev, NULL); - this_cpu_write(dead_event, event); - cpumask_set_cpu(smp_processor_id(), &dead_events_mask); atomic_dec(&watchdog_cpus); } } /** - * hardlockup_detector_perf_cleanup - Cleanup disabled events and destroy them - * - * Called from lockup_detector_cleanup(). Serialized by the caller. - */ -void hardlockup_detector_perf_cleanup(void) -{ - int cpu; - - for_each_cpu(cpu, &dead_events_mask) { - struct perf_event *event = per_cpu(dead_event, cpu); - - /* - * Required because for_each_cpu() reports unconditionally - * CPU0 as set on UP kernels. Sigh. - */ - if (event) - perf_event_release_kernel(event); - per_cpu(dead_event, cpu) = NULL; - } - cpumask_clear(&dead_events_mask); -} - -/** * hardlockup_detector_perf_stop - Globally stop watchdog events * * Special interface for x86 to handle the perf HT bug. |