Import changeset

1 files changed, 103 insertions, 0 deletions

diff --git a/kernel/panic.c b/kernel/panic.c
new file mode 100644
index 000000000000..ac246f74589a
--- /dev/null
+++ b/kernel/panic.c
@@ -0,0 +1,103 @@
+/*
+ *  linux/kernel/panic.c
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ */
+
+/*
+ * This function is used through-out the kernel (including mm and fs)
+ * to indicate a major problem.
+ */
+#include <linux/config.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+#include <linux/reboot.h>
+#include <linux/notifier.h>
+#include <linux/init.h>
+#include <linux/sysrq.h>
+#include <linux/interrupt.h>
+
+asmlinkage void sys_sync(void);	/* it's really int */
+extern void unblank_console(void);
+
+int panic_timeout;
+
+struct notifier_block *panic_notifier_list;
+
+static int __init panic_setup(char *str)
+{
+	panic_timeout = simple_strtoul(str, NULL, 0);
+	return 1;
+}
+
+__setup("panic=", panic_setup);
+
+/**
+ *	panic - halt the system
+ *	@fmt: The text string to print
+ *
+ *	Display a message, then unblank the console and perform
+ *	cleanups. Functions in the panic notifier list are called
+ *	after the filesystem cache is flushed (when possible).
+ *
+ *	This function never returns.
+ */
+ 
+NORET_TYPE void panic(const char * fmt, ...)
+{
+	static char buf[1024];
+	va_list args;
+#if defined(CONFIG_ARCH_S390)
+        unsigned long caller = (unsigned long) __builtin_return_address(0);
+#endif
+
+	va_start(args, fmt);
+	vsprintf(buf, fmt, args);
+	va_end(args);
+	printk(KERN_EMERG "Kernel panic: %s\n",buf);
+	if (in_interrupt())
+		printk(KERN_EMERG "In interrupt handler - not syncing\n");
+	else if (!current->pid)
+		printk(KERN_EMERG "In idle task - not syncing\n");
+	else
+		sys_sync();
+
+	unblank_console();
+
+#ifdef CONFIG_SMP
+	smp_send_stop();
+#endif
+
+	notifier_call_chain(&panic_notifier_list, 0, NULL);
+
+	if (panic_timeout > 0)
+	{
+		/*
+	 	 * Delay timeout seconds before rebooting the machine. 
+		 * We can't use the "normal" timers since we just panicked..
+	 	 */
+		printk(KERN_EMERG "Rebooting in %d seconds..",panic_timeout);
+		mdelay(panic_timeout*1000);
+		/*
+		 *	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.
+		 */
+		machine_restart(NULL);
+	}
+#ifdef __sparc__
+	{
+		extern int stop_a_enabled;
+		/* Make sure the user can actually press L1-A */
+		stop_a_enabled = 1;
+		printk("Press L1-A to return to the boot prom\n");
+	}
+#endif
+#if defined(CONFIG_ARCH_S390)
+        disabled_wait(caller);
+#endif
+	sti();
+	for(;;) {
+		CHECK_EMERGENCY_SYNC
+	}
+}