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Diffstat (limited to 'arch/x86/kernel/nmi_64.c')
-rw-r--r--arch/x86/kernel/nmi_64.c99
1 files changed, 49 insertions, 50 deletions
diff --git a/arch/x86/kernel/nmi_64.c b/arch/x86/kernel/nmi_64.c
index c3d1476b6a1..fb99484d21c 100644
--- a/arch/x86/kernel/nmi_64.c
+++ b/arch/x86/kernel/nmi_64.c
@@ -39,7 +39,7 @@ static cpumask_t backtrace_mask = CPU_MASK_NONE;
* 0: the lapic NMI watchdog is disabled, but can be enabled
*/
atomic_t nmi_active = ATOMIC_INIT(0); /* oprofile uses this */
-int panic_on_timeout;
+static int panic_on_timeout;
unsigned int nmi_watchdog = NMI_DEFAULT;
static unsigned int nmi_hz = HZ;
@@ -78,22 +78,22 @@ static __init void nmi_cpu_busy(void *data)
}
#endif
-int __init check_nmi_watchdog (void)
+int __init check_nmi_watchdog(void)
{
- int *counts;
+ int *prev_nmi_count;
int cpu;
- if ((nmi_watchdog == NMI_NONE) || (nmi_watchdog == NMI_DISABLED))
+ if ((nmi_watchdog == NMI_NONE) || (nmi_watchdog == NMI_DISABLED))
return 0;
if (!atomic_read(&nmi_active))
return 0;
- counts = kmalloc(NR_CPUS * sizeof(int), GFP_KERNEL);
- if (!counts)
+ prev_nmi_count = kmalloc(NR_CPUS * sizeof(int), GFP_KERNEL);
+ if (!prev_nmi_count)
return -1;
- printk(KERN_INFO "testing NMI watchdog ... ");
+ printk(KERN_INFO "Testing NMI watchdog ... ");
#ifdef CONFIG_SMP
if (nmi_watchdog == NMI_LOCAL_APIC)
@@ -101,30 +101,29 @@ int __init check_nmi_watchdog (void)
#endif
for (cpu = 0; cpu < NR_CPUS; cpu++)
- counts[cpu] = cpu_pda(cpu)->__nmi_count;
+ prev_nmi_count[cpu] = cpu_pda(cpu)->__nmi_count;
local_irq_enable();
mdelay((20*1000)/nmi_hz); // wait 20 ticks
for_each_online_cpu(cpu) {
if (!per_cpu(wd_enabled, cpu))
continue;
- if (cpu_pda(cpu)->__nmi_count - counts[cpu] <= 5) {
+ if (cpu_pda(cpu)->__nmi_count - prev_nmi_count[cpu] <= 5) {
printk(KERN_WARNING "WARNING: CPU#%d: NMI "
"appears to be stuck (%d->%d)!\n",
- cpu,
- counts[cpu],
- cpu_pda(cpu)->__nmi_count);
+ cpu,
+ prev_nmi_count[cpu],
+ cpu_pda(cpu)->__nmi_count);
per_cpu(wd_enabled, cpu) = 0;
atomic_dec(&nmi_active);
}
}
+ endflag = 1;
if (!atomic_read(&nmi_active)) {
- kfree(counts);
+ kfree(prev_nmi_count);
atomic_set(&nmi_active, -1);
- endflag = 1;
return -1;
}
- endflag = 1;
printk("OK.\n");
/* now that we know it works we can reduce NMI frequency to
@@ -132,11 +131,11 @@ int __init check_nmi_watchdog (void)
if (nmi_watchdog == NMI_LOCAL_APIC)
nmi_hz = lapic_adjust_nmi_hz(1);
- kfree(counts);
+ kfree(prev_nmi_count);
return 0;
}
-int __init setup_nmi_watchdog(char *str)
+static int __init setup_nmi_watchdog(char *str)
{
int nmi;
@@ -159,34 +158,6 @@ int __init setup_nmi_watchdog(char *str)
__setup("nmi_watchdog=", setup_nmi_watchdog);
-
-static void __acpi_nmi_disable(void *__unused)
-{
- apic_write(APIC_LVT0, APIC_DM_NMI | APIC_LVT_MASKED);
-}
-
-/*
- * Disable timer based NMIs on all CPUs:
- */
-void acpi_nmi_disable(void)
-{
- if (atomic_read(&nmi_active) && nmi_watchdog == NMI_IO_APIC)
- on_each_cpu(__acpi_nmi_disable, NULL, 0, 1);
-}
-
-static void __acpi_nmi_enable(void *__unused)
-{
- apic_write(APIC_LVT0, APIC_DM_NMI);
-}
-
-/*
- * Enable timer based NMIs on all CPUs:
- */
-void acpi_nmi_enable(void)
-{
- if (atomic_read(&nmi_active) && nmi_watchdog == NMI_IO_APIC)
- on_each_cpu(__acpi_nmi_enable, NULL, 0, 1);
-}
#ifdef CONFIG_PM
static int nmi_pm_active; /* nmi_active before suspend */
@@ -217,7 +188,7 @@ static struct sysdev_class nmi_sysclass = {
};
static struct sys_device device_lapic_nmi = {
- .id = 0,
+ .id = 0,
.cls = &nmi_sysclass,
};
@@ -231,7 +202,7 @@ static int __init init_lapic_nmi_sysfs(void)
if (nmi_watchdog != NMI_LOCAL_APIC)
return 0;
- if ( atomic_read(&nmi_active) < 0 )
+ if (atomic_read(&nmi_active) < 0)
return 0;
error = sysdev_class_register(&nmi_sysclass);
@@ -244,9 +215,37 @@ late_initcall(init_lapic_nmi_sysfs);
#endif /* CONFIG_PM */
+static void __acpi_nmi_enable(void *__unused)
+{
+ apic_write(APIC_LVT0, APIC_DM_NMI);
+}
+
+/*
+ * Enable timer based NMIs on all CPUs:
+ */
+void acpi_nmi_enable(void)
+{
+ if (atomic_read(&nmi_active) && nmi_watchdog == NMI_IO_APIC)
+ on_each_cpu(__acpi_nmi_enable, NULL, 0, 1);
+}
+
+static void __acpi_nmi_disable(void *__unused)
+{
+ apic_write(APIC_LVT0, APIC_DM_NMI | APIC_LVT_MASKED);
+}
+
+/*
+ * Disable timer based NMIs on all CPUs:
+ */
+void acpi_nmi_disable(void)
+{
+ if (atomic_read(&nmi_active) && nmi_watchdog == NMI_IO_APIC)
+ on_each_cpu(__acpi_nmi_disable, NULL, 0, 1);
+}
+
void setup_apic_nmi_watchdog(void *unused)
{
- if (__get_cpu_var(wd_enabled) == 1)
+ if (__get_cpu_var(wd_enabled))
return;
/* cheap hack to support suspend/resume */
@@ -311,8 +310,9 @@ void touch_nmi_watchdog(void)
}
}
- touch_softlockup_watchdog();
+ touch_softlockup_watchdog();
}
+EXPORT_SYMBOL(touch_nmi_watchdog);
int __kprobes nmi_watchdog_tick(struct pt_regs * regs, unsigned reason)
{
@@ -479,4 +479,3 @@ void __trigger_all_cpu_backtrace(void)
EXPORT_SYMBOL(nmi_active);
EXPORT_SYMBOL(nmi_watchdog);
-EXPORT_SYMBOL(touch_nmi_watchdog);