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-rw-r--r--kernel/softlockup.c20
1 files changed, 13 insertions, 7 deletions
diff --git a/kernel/softlockup.c b/kernel/softlockup.c
index e423b3a918f..65839c54abf 100644
--- a/kernel/softlockup.c
+++ b/kernel/softlockup.c
@@ -15,6 +15,8 @@
#include <linux/notifier.h>
#include <linux/module.h>
+#include <asm/irq_regs.h>
+
static DEFINE_SPINLOCK(print_lock);
static DEFINE_PER_CPU(unsigned long, touch_timestamp);
@@ -72,6 +74,7 @@ void softlockup_tick(void)
int this_cpu = smp_processor_id();
unsigned long touch_timestamp = per_cpu(touch_timestamp, this_cpu);
unsigned long print_timestamp;
+ struct pt_regs *regs = get_irq_regs();
unsigned long now;
if (touch_timestamp == 0) {
@@ -101,15 +104,18 @@ void softlockup_tick(void)
wake_up_process(per_cpu(watchdog_task, this_cpu));
/* Warn about unreasonable 10+ seconds delays: */
- if (now > (touch_timestamp + 10)) {
- per_cpu(print_timestamp, this_cpu) = touch_timestamp;
+ if (now <= (touch_timestamp + 10))
+ return;
- spin_lock(&print_lock);
- printk(KERN_ERR "BUG: soft lockup detected on CPU#%d!\n",
- this_cpu);
+ per_cpu(print_timestamp, this_cpu) = touch_timestamp;
+
+ spin_lock(&print_lock);
+ printk(KERN_ERR "BUG: soft lockup detected on CPU#%d!\n", this_cpu);
+ if (regs)
+ show_regs(regs);
+ else
dump_stack();
- spin_unlock(&print_lock);
- }
+ spin_unlock(&print_lock);
}
/*