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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /kernel/panic.c
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Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'kernel/panic.c')
-rw-r--r--kernel/panic.c157
1 files changed, 157 insertions, 0 deletions
diff --git a/kernel/panic.c b/kernel/panic.c
new file mode 100644
index 00000000000..0fa3f3a66fb
--- /dev/null
+++ b/kernel/panic.c
@@ -0,0 +1,157 @@
+/*
+ * 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/module.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>
+#include <linux/nmi.h>
+
+int panic_timeout;
+int panic_on_oops;
+int tainted;
+
+EXPORT_SYMBOL(panic_timeout);
+
+struct notifier_block *panic_notifier_list;
+
+EXPORT_SYMBOL(panic_notifier_list);
+
+static int __init panic_setup(char *str)
+{
+ panic_timeout = simple_strtoul(str, NULL, 0);
+ return 1;
+}
+__setup("panic=", panic_setup);
+
+static long no_blink(long time)
+{
+ return 0;
+}
+
+/* Returns how long it waited in ms */
+long (*panic_blink)(long time);
+EXPORT_SYMBOL(panic_blink);
+
+/**
+ * panic - halt the system
+ * @fmt: The text string to print
+ *
+ * Display a message, then perform cleanups.
+ *
+ * This function never returns.
+ */
+
+NORET_TYPE void panic(const char * fmt, ...)
+{
+ long i;
+ static char buf[1024];
+ va_list args;
+#if defined(CONFIG_ARCH_S390)
+ unsigned long caller = (unsigned long) __builtin_return_address(0);
+#endif
+
+ bust_spinlocks(1);
+ va_start(args, fmt);
+ vsnprintf(buf, sizeof(buf), fmt, args);
+ va_end(args);
+ printk(KERN_EMERG "Kernel panic - not syncing: %s\n",buf);
+ bust_spinlocks(0);
+
+#ifdef CONFIG_SMP
+ smp_send_stop();
+#endif
+
+ notifier_call_chain(&panic_notifier_list, 0, buf);
+
+ if (!panic_blink)
+ panic_blink = no_blink;
+
+ 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);
+ for (i = 0; i < panic_timeout*1000; ) {
+ touch_nmi_watchdog();
+ i += panic_blink(i);
+ 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.
+ */
+ machine_restart(NULL);
+ }
+#ifdef __sparc__
+ {
+ extern int stop_a_enabled;
+ /* Make sure the user can actually press L1-A */
+ stop_a_enabled = 1;
+ printk(KERN_EMERG "Press L1-A to return to the boot prom\n");
+ }
+#endif
+#if defined(CONFIG_ARCH_S390)
+ disabled_wait(caller);
+#endif
+ local_irq_enable();
+ for (i = 0;;) {
+ i += panic_blink(i);
+ mdelay(1);
+ i++;
+ }
+}
+
+EXPORT_SYMBOL(panic);
+
+/**
+ * print_tainted - return a string to represent the kernel taint state.
+ *
+ * 'P' - Proprietary module has been loaded.
+ * 'F' - Module has been forcibly loaded.
+ * 'S' - SMP with CPUs not designed for SMP.
+ * 'R' - User forced a module unload.
+ * 'M' - Machine had a machine check experience.
+ * 'B' - System has hit bad_page.
+ *
+ * The string is overwritten by the next call to print_taint().
+ */
+
+const char *print_tainted(void)
+{
+ static char buf[20];
+ if (tainted) {
+ snprintf(buf, sizeof(buf), "Tainted: %c%c%c%c%c%c",
+ tainted & TAINT_PROPRIETARY_MODULE ? 'P' : 'G',
+ tainted & TAINT_FORCED_MODULE ? 'F' : ' ',
+ tainted & TAINT_UNSAFE_SMP ? 'S' : ' ',
+ tainted & TAINT_FORCED_RMMOD ? 'R' : ' ',
+ tainted & TAINT_MACHINE_CHECK ? 'M' : ' ',
+ tainted & TAINT_BAD_PAGE ? 'B' : ' ');
+ }
+ else
+ snprintf(buf, sizeof(buf), "Not tainted");
+ return(buf);
+}
+
+void add_taint(unsigned flag)
+{
+ tainted |= flag;
+}
+EXPORT_SYMBOL(add_taint);