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Revert "NMI watchdog: fix for lockup detector breakage on resume"

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Revert commit 45226e9 (NMI watchdog: fix for lockup detector breakage
on resume) which breaks resume from system suspend on my SH7372
Mackerel board (by causing a NULL pointer dereference to happen) and
is generally wrong, because it abuses the CPU hotplug functionality
in a shamelessly blatant way.

The original issue should be addressed through appropriate syscore
resume callback instead.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Rafael J. Wysocki 2012-08-07 13:50:22 +02:00
parent 77254950bb
commit 300d3739e8
3 changed files with 2 additions and 30 deletions
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8
include/linux/sched.h
View file

@ -334,14 +334,6 @@ static inline void lockup_detector_init(void)
}
#endif
#if defined(CONFIG_LOCKUP_DETECTOR) && defined(CONFIG_SUSPEND)
void lockup_detector_bootcpu_resume(void);
#else
static inline void lockup_detector_bootcpu_resume(void)
{
}
#endif
#ifdef CONFIG_DETECT_HUNG_TASK
extern unsigned int sysctl_hung_task_panic;
extern unsigned long sysctl_hung_task_check_count;

3
kernel/power/suspend.c
View file

@ -178,9 +178,6 @@ static int suspend_enter(suspend_state_t state, bool *wakeup)
arch_suspend_enable_irqs();
BUG_ON(irqs_disabled());
/* Kick the lockup detector */
lockup_detector_bootcpu_resume();
Enable_cpus:
enable_nonboot_cpus();

21
kernel/watchdog.c
View file

@ -575,7 +575,7 @@ int proc_dowatchdog(struct ctl_table *table, int write,
/*
* Create/destroy watchdog threads as CPUs come and go:
*/
static int
static int __cpuinit
cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
{
int hotcpu = (unsigned long)hcpu;
@ -610,27 +610,10 @@ cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
return NOTIFY_OK;
}
static struct notifier_block cpu_nfb = {
static struct notifier_block __cpuinitdata cpu_nfb = {
.notifier_call = cpu_callback
};
#ifdef CONFIG_SUSPEND
/*
* On exit from suspend we force an offline->online transition on the boot CPU
* so that the PMU state that was lost while in suspended state gets set up
* properly for the boot CPU. This information is required for restarting the
* NMI watchdog.
*/
void lockup_detector_bootcpu_resume(void)
{
void *cpu = (void *)(long)smp_processor_id();
cpu_callback(&cpu_nfb, CPU_DEAD_FROZEN, cpu);
cpu_callback(&cpu_nfb, CPU_UP_PREPARE_FROZEN, cpu);
cpu_callback(&cpu_nfb, CPU_ONLINE_FROZEN, cpu);
}
#endif
void __init lockup_detector_init(void)
{
void *cpu = (void *)(long)smp_processor_id();