/*
- * linux/arch/i386/nmi.c
- *
* NMI watchdog support on APIC systems
*
* Started by Ingo Molnar <mingo@redhat.com>
#include <asm/smp.h>
#include <asm/nmi.h>
+#include <asm/timer.h>
#include "mach_traps.h"
static int endflag __initdata = 0;
-#ifdef CONFIG_SMP
/* The performance counters used by NMI_LOCAL_APIC don't trigger when
* the CPU is idle. To make sure the NMI watchdog really ticks on all
* CPUs during the test make them busy.
*/
static __init void nmi_cpu_busy(void *data)
{
+#ifdef CONFIG_SMP
local_irq_enable_in_hardirq();
/* Intentionally don't use cpu_relax here. This is
to make sure that the performance counter really ticks,
care if they get somewhat less cycles. */
while (endflag == 0)
mb();
-}
#endif
+}
static int __init check_nmi_watchdog(void)
{
prev_nmi_count = kmalloc(NR_CPUS * sizeof(int), GFP_KERNEL);
if (!prev_nmi_count)
- return -1;
+ goto error;
printk(KERN_INFO "Testing NMI watchdog ... ");
if (!atomic_read(&nmi_active)) {
kfree(prev_nmi_count);
atomic_set(&nmi_active, -1);
- return -1;
+ goto error;
}
printk("OK.\n");
kfree(prev_nmi_count);
return 0;
+error:
+ timer_ack = !cpu_has_tsc;
+
+ return -1;
}
/* This needs to happen later in boot so counters are working */
late_initcall(check_nmi_watchdog);