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>
This commit is contained in:
Ingo Molnar 2009-03-13 11:14:06 +01:00
Родитель d1dedb52ac
Коммит c95dbf27e2
1 изменённых файлов: 61 добавлений и 54 удалений

Просмотреть файл

@ -8,19 +8,19 @@
* This function is used through-out the kernel (including mm and fs)
* to indicate a major problem.
*/
#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>
#include <linux/kexec.h>
#include <linux/debug_locks.h>
#include <linux/random.h>
#include <linux/interrupt.h>
#include <linux/kallsyms.h>
#include <linux/notifier.h>
#include <linux/module.h>
#include <linux/random.h>
#include <linux/reboot.h>
#include <linux/delay.h>
#include <linux/kexec.h>
#include <linux/sched.h>
#include <linux/sysrq.h>
#include <linux/init.h>
#include <linux/nmi.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();
}