panic: clean up kernel/panic.c

Impact: cleanup, no code changed

Clean up kernel/panic.c some more and make it more consistent.

LKML-Reference: <49B91A7E.76E4.0078.0@novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/panic.c b/kernel/panic.c
index ca75e819d0ea441d008260cf0671c56fcc7fbdc6..3fd8c5bf8b394dd94fee9ce22fa8c20135c76c4f 100644 (file)
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -8,19 +8,19 @@
  * This function is used through-out the kernel (including mm and fs)
  * to indicate a major problem.
  */
+#include <linux/debug_locks.h>
+#include <linux/interrupt.h>
+#include <linux/kallsyms.h>
+#include <linux/notifier.h>
 #include <linux/module.h>
-#include <linux/sched.h>
-#include <linux/delay.h>
+#include <linux/random.h>
 #include <linux/reboot.h>
-#include <linux/notifier.h>
-#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/kexec.h>
+#include <linux/sched.h>
 #include <linux/sysrq.h>
-#include <linux/interrupt.h>
+#include <linux/init.h>
 #include <linux/nmi.h>
-#include <linux/kexec.h>
-#include <linux/debug_locks.h>
-#include <linux/random.h>
-#include <linux/kallsyms.h>
 #include <linux/dmi.h>
 
 int panic_on_oops;
@@ -52,19 +52,15 @@ EXPORT_SYMBOL(panic_blink);
  *
  *     This function never returns.
  */
-
 NORET_TYPE void panic(const char * fmt, ...)
 {
-       long i;
        static char buf[1024];
        va_list args;
-#if defined(CONFIG_S390)
-       unsigned long caller = (unsigned long) __builtin_return_address(0);
-#endif
+       long i;
 
        /*
-        * It's possible to come here directly from a panic-assertion and not
-        * have preempt disabled. Some functions called from here want
+        * 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();
@@ -99,19 +95,21 @@ NORET_TYPE void panic(const char * fmt, ...)
 
        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);
+                * 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++;
                }
-               /*      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.
+               /*
+                * 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.
                 */
                emergency_restart();
        }
@@ -124,10 +122,15 @@ NORET_TYPE void panic(const char * fmt, ...)
        }
 #endif
 #if defined(CONFIG_S390)
-       disabled_wait(caller);
+       {
+               unsigned long caller;
+
+               caller = (unsigned long)__builtin_return_address(0);
+               disabled_wait(caller);
+       }
 #endif
        local_irq_enable();
-       for (i = 0;;) {
+       for (i = 0; ; ) {
                touch_softlockup_watchdog();
                i += panic_blink(i);
                mdelay(1);
@@ -140,23 +143,23 @@ EXPORT_SYMBOL(panic);
 
 
 struct tnt {
-       u8 bit;
-       char true;
-       char false;
+       u8      bit;
+       char    true;
+       char    false;
 };
 
 static const struct tnt tnts[] = {
-       { TAINT_PROPRIETARY_MODULE, 'P', 'G' },
-       { TAINT_FORCED_MODULE, 'F', ' ' },
-       { TAINT_UNSAFE_SMP, 'S', ' ' },
-       { TAINT_FORCED_RMMOD, 'R', ' ' },
-       { TAINT_MACHINE_CHECK, 'M', ' ' },
-       { TAINT_BAD_PAGE, 'B', ' ' },
-       { TAINT_USER, 'U', ' ' },
-       { TAINT_DIE, 'D', ' ' },
-       { TAINT_OVERRIDDEN_ACPI_TABLE, 'A', ' ' },
-       { TAINT_WARN, 'W', ' ' },
-       { TAINT_CRAP, 'C', ' ' },
+       { TAINT_PROPRIETARY_MODULE,     'P', 'G' },
+       { TAINT_FORCED_MODULE,          'F', ' ' },
+       { TAINT_UNSAFE_SMP,             'S', ' ' },
+       { TAINT_FORCED_RMMOD,           'R', ' ' },
+       { TAINT_MACHINE_CHECK,          'M', ' ' },
+       { TAINT_BAD_PAGE,               'B', ' ' },
+       { TAINT_USER,                   'U', ' ' },
+       { TAINT_DIE,                    'D', ' ' },
+       { TAINT_OVERRIDDEN_ACPI_TABLE,  'A', ' ' },
+       { TAINT_WARN,                   'W', ' ' },
+       { TAINT_CRAP,                   'C', ' ' },
 };
 
 /**
@@ -193,7 +196,8 @@ const char *print_tainted(void)
                *s = 0;
        } else
                snprintf(buf, sizeof(buf), "Not tainted");
-       return(buf);
+
+       return buf;
 }
 
 int test_taint(unsigned flag)
@@ -209,7 +213,8 @@ unsigned long get_taint(void)
 
 void add_taint(unsigned flag)
 {
-       debug_locks = 0; /* can't trust the integrity of the kernel anymore */
+       /* can't trust the integrity of the kernel anymore: */
+       debug_locks = 0;
        set_bit(flag, &tainted_mask);
 }
 EXPORT_SYMBOL(add_taint);
@@ -264,8 +269,8 @@ static void do_oops_enter_exit(void)
 }
 
 /*
- * Return true if the calling CPU is allowed to print oops-related info.  This
- * is a bit racy..
+ * Return true if the calling CPU is allowed to print oops-related info.
+ * This is a bit racy..
  */
 int oops_may_print(void)
 {
@@ -274,20 +279,22 @@ int oops_may_print(void)
 
 /*
  * Called when the architecture enters its oops handler, before it prints
- * anything.  If this is the first CPU to oops, and it's oopsing the first time
- * then let it proceed.
+ * anything.  If this is the first CPU to oops, and it's oopsing the first
+ * time then let it proceed.
  *
- * This is all enabled by the pause_on_oops kernel boot option.  We do all this
- * to ensure that oopses don't scroll off the screen.  It has the side-effect
- * of preventing later-oopsing CPUs from mucking up the display, too.
+ * This is all enabled by the pause_on_oops kernel boot option.  We do all
+ * this to ensure that oopses don't scroll off the screen.  It has the
+ * side-effect of preventing later-oopsing CPUs from mucking up the display,
+ * too.
  *
- * It turns out that the CPU which is allowed to print ends up pausing for the
- * right duration, whereas all the other CPUs pause for twice as long: once in
- * oops_enter(), once in oops_exit().
+ * It turns out that the CPU which is allowed to print ends up pausing for
+ * the right duration, whereas all the other CPUs pause for twice as long:
+ * once in oops_enter(), once in oops_exit().
  */
 void oops_enter(void)
 {
-       debug_locks_off(); /* can't trust the integrity of the kernel anymore */
+       /* can't trust the integrity of the kernel anymore: */
+       debug_locks_off();
        do_oops_enter_exit();
 }