int __init check_nmi_watchdog (void)
{
irq_cpustat_t tmp[NR_CPUS];
int j, cpu;
if (nmi_watchdog == NMI_LOCAL_APIC && !cpu_has_lapic())
return -1;
printk(KERN_INFO "testing NMI watchdog ... ");
memcpy(tmp, irq_stat, sizeof(tmp));
sti();
mdelay((10*1000)/nmi_hz); // wait 10 ticks
for (j = 0; j < smp_num_cpus; j++) {
cpu = cpu_logical_map(j);
if (nmi_count(cpu) - tmp[cpu].__nmi_count <= 5) {
printk("CPU#%d: NMI appears to be stuck!\n", cpu);
return -1;
}
}
printk("OK.\n");
/* now that we know it works we can reduce NMI frequency to
something more reasonable; makes a difference in some configs */
if (nmi_watchdog == NMI_LOCAL_APIC)
nmi_hz = 1;
return 0;
}
static int __init check_nmi_watchdog (void)
{
int counts[NR_CPUS];
int cpu;
if (nmi_watchdog == NMI_NONE)
return 0;
if (nmi_watchdog == NMI_LOCAL_APIC && !cpu_has_lapic()) {
nmi_watchdog = NMI_NONE;
return -1;
}
printk(KERN_INFO "Testing NMI watchdog ... ");
for (cpu = 0; cpu < NR_CPUS; cpu++)
counts[cpu] = cpu_pda[cpu].__nmi_count;
local_irq_enable();
mdelay((10*1000)/nmi_hz); // wait 10 ticks
for (cpu = 0; cpu < NR_CPUS; cpu++) {
#ifdef CONFIG_SMP
/* Check cpu_callin_map here because that is set
after the timer is started. */
if (!cpu_isset(cpu, cpu_callin_map))
continue;
#endif
if (cpu_pda[cpu].__nmi_count - counts[cpu] <= 5) {
printk("CPU#%d: NMI appears to be stuck (%d)!\n",
cpu,
cpu_pda[cpu].__nmi_count);
nmi_active = 0;
lapic_nmi_owner &= ~LAPIC_NMI_WATCHDOG;
return -1;
}
}
printk("OK.\n");
/* now that we know it works we can reduce NMI frequency to
something more reasonable; makes a difference in some configs */
if (nmi_watchdog == NMI_LOCAL_APIC)
nmi_hz = 1;
return 0;
}