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-rw-r--r--kernel/panic.c32
1 files changed, 25 insertions, 7 deletions
diff --git a/kernel/panic.c b/kernel/panic.c
index 081f7465fc8..aabc5f86fa3 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -18,6 +18,7 @@
#include <linux/sysrq.h>
#include <linux/interrupt.h>
#include <linux/nmi.h>
+#include <linux/kexec.h>
int panic_timeout;
int panic_on_oops;
@@ -63,6 +64,13 @@ NORET_TYPE void panic(const char * fmt, ...)
unsigned long caller = (unsigned long) __builtin_return_address(0);
#endif
+ /*
+ * It's possible to come here directly from a panic-assertion and not
+ * have preempt disabled. Some functions called from here want
+ * preempt to be disabled. No point enabling it later though...
+ */
+ preempt_disable();
+
bust_spinlocks(1);
va_start(args, fmt);
vsnprintf(buf, sizeof(buf), fmt, args);
@@ -70,7 +78,19 @@ NORET_TYPE void panic(const char * fmt, ...)
printk(KERN_EMERG "Kernel panic - not syncing: %s\n",buf);
bust_spinlocks(0);
+ /*
+ * If we have crashed and we have a crash kernel loaded let it handle
+ * everything else.
+ * Do we want to call this before we try to display a message?
+ */
+ crash_kexec(NULL);
+
#ifdef CONFIG_SMP
+ /*
+ * Note smp_send_stop is the usual smp shutdown function, which
+ * unfortunately means it may not be hardened to work in a panic
+ * situation.
+ */
smp_send_stop();
#endif
@@ -79,8 +99,7 @@ NORET_TYPE void panic(const char * fmt, ...)
if (!panic_blink)
panic_blink = no_blink;
- if (panic_timeout > 0)
- {
+ if (panic_timeout > 0) {
/*
* Delay timeout seconds before rebooting the machine.
* We can't use the "normal" timers since we just panicked..
@@ -92,12 +111,11 @@ NORET_TYPE void panic(const char * fmt, ...)
mdelay(1);
i++;
}
- /*
- * Should we run the reboot notifier. For the moment Im
- * choosing not too. It might crash, be corrupt or do
- * more harm than good for other reasons.
+ /* This will not be a clean reboot, with everything
+ * shutting down. But if there is a chance of
+ * rebooting the system it will be rebooted.
*/
- machine_restart(NULL);
+ emergency_restart();
}
#ifdef __sparc__
{