mirror of https://gitee.com/openkylin/linux.git
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
parent
d1dedb52ac
commit
c95dbf27e2
115
kernel/panic.c
115
kernel/panic.c
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@ -8,19 +8,19 @@
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* This function is used through-out the kernel (including mm and fs)
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* to indicate a major problem.
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*/
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/delay.h>
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#include <linux/reboot.h>
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#include <linux/notifier.h>
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#include <linux/init.h>
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#include <linux/sysrq.h>
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#include <linux/interrupt.h>
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#include <linux/nmi.h>
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#include <linux/kexec.h>
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#include <linux/debug_locks.h>
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#include <linux/random.h>
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#include <linux/interrupt.h>
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#include <linux/kallsyms.h>
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#include <linux/notifier.h>
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#include <linux/module.h>
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#include <linux/random.h>
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#include <linux/reboot.h>
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#include <linux/delay.h>
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#include <linux/kexec.h>
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#include <linux/sched.h>
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#include <linux/sysrq.h>
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#include <linux/init.h>
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#include <linux/nmi.h>
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#include <linux/dmi.h>
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int panic_on_oops;
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@ -52,19 +52,15 @@ EXPORT_SYMBOL(panic_blink);
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*
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* This function never returns.
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*/
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NORET_TYPE void panic(const char * fmt, ...)
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{
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long i;
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static char buf[1024];
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va_list args;
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#if defined(CONFIG_S390)
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unsigned long caller = (unsigned long) __builtin_return_address(0);
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#endif
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long i;
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/*
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* It's possible to come here directly from a panic-assertion and not
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* have preempt disabled. Some functions called from here want
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* It's possible to come here directly from a panic-assertion and
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* not have preempt disabled. Some functions called from here want
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* preempt to be disabled. No point enabling it later though...
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*/
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preempt_disable();
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@ -99,19 +95,21 @@ NORET_TYPE void panic(const char * fmt, ...)
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if (panic_timeout > 0) {
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/*
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* Delay timeout seconds before rebooting the machine.
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* We can't use the "normal" timers since we just panicked..
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*/
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printk(KERN_EMERG "Rebooting in %d seconds..",panic_timeout);
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* Delay timeout seconds before rebooting the machine.
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* We can't use the "normal" timers since we just panicked.
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*/
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printk(KERN_EMERG "Rebooting in %d seconds..", panic_timeout);
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for (i = 0; i < panic_timeout*1000; ) {
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touch_nmi_watchdog();
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i += panic_blink(i);
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mdelay(1);
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i++;
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}
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/* This will not be a clean reboot, with everything
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* shutting down. But if there is a chance of
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* rebooting the system it will be rebooted.
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/*
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* This will not be a clean reboot, with everything
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* shutting down. But if there is a chance of
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* rebooting the system it will be rebooted.
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*/
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emergency_restart();
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}
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@ -124,10 +122,15 @@ NORET_TYPE void panic(const char * fmt, ...)
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}
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#endif
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#if defined(CONFIG_S390)
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disabled_wait(caller);
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{
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unsigned long caller;
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caller = (unsigned long)__builtin_return_address(0);
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disabled_wait(caller);
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}
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#endif
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local_irq_enable();
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for (i = 0;;) {
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for (i = 0; ; ) {
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touch_softlockup_watchdog();
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i += panic_blink(i);
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mdelay(1);
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@ -140,23 +143,23 @@ EXPORT_SYMBOL(panic);
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struct tnt {
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u8 bit;
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char true;
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char false;
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u8 bit;
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char true;
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char false;
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};
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static const struct tnt tnts[] = {
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{ TAINT_PROPRIETARY_MODULE, 'P', 'G' },
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{ TAINT_FORCED_MODULE, 'F', ' ' },
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{ TAINT_UNSAFE_SMP, 'S', ' ' },
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{ TAINT_FORCED_RMMOD, 'R', ' ' },
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{ TAINT_MACHINE_CHECK, 'M', ' ' },
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{ TAINT_BAD_PAGE, 'B', ' ' },
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{ TAINT_USER, 'U', ' ' },
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{ TAINT_DIE, 'D', ' ' },
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{ TAINT_OVERRIDDEN_ACPI_TABLE, 'A', ' ' },
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{ TAINT_WARN, 'W', ' ' },
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{ TAINT_CRAP, 'C', ' ' },
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{ TAINT_PROPRIETARY_MODULE, 'P', 'G' },
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{ TAINT_FORCED_MODULE, 'F', ' ' },
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{ TAINT_UNSAFE_SMP, 'S', ' ' },
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{ TAINT_FORCED_RMMOD, 'R', ' ' },
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{ TAINT_MACHINE_CHECK, 'M', ' ' },
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{ TAINT_BAD_PAGE, 'B', ' ' },
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{ TAINT_USER, 'U', ' ' },
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{ TAINT_DIE, 'D', ' ' },
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{ TAINT_OVERRIDDEN_ACPI_TABLE, 'A', ' ' },
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{ TAINT_WARN, 'W', ' ' },
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{ TAINT_CRAP, 'C', ' ' },
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};
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/**
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@ -193,7 +196,8 @@ const char *print_tainted(void)
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*s = 0;
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} else
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snprintf(buf, sizeof(buf), "Not tainted");
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return(buf);
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return buf;
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}
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int test_taint(unsigned flag)
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@ -209,7 +213,8 @@ unsigned long get_taint(void)
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void add_taint(unsigned flag)
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{
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debug_locks = 0; /* can't trust the integrity of the kernel anymore */
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/* can't trust the integrity of the kernel anymore: */
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debug_locks = 0;
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set_bit(flag, &tainted_mask);
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}
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EXPORT_SYMBOL(add_taint);
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@ -264,8 +269,8 @@ static void do_oops_enter_exit(void)
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}
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/*
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* Return true if the calling CPU is allowed to print oops-related info. This
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* is a bit racy..
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* Return true if the calling CPU is allowed to print oops-related info.
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* This is a bit racy..
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*/
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int oops_may_print(void)
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{
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@ -274,20 +279,22 @@ int oops_may_print(void)
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/*
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* Called when the architecture enters its oops handler, before it prints
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* anything. If this is the first CPU to oops, and it's oopsing the first time
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* then let it proceed.
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* anything. If this is the first CPU to oops, and it's oopsing the first
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* time then let it proceed.
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*
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* This is all enabled by the pause_on_oops kernel boot option. We do all this
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* to ensure that oopses don't scroll off the screen. It has the side-effect
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* of preventing later-oopsing CPUs from mucking up the display, too.
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* This is all enabled by the pause_on_oops kernel boot option. We do all
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* this to ensure that oopses don't scroll off the screen. It has the
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* side-effect of preventing later-oopsing CPUs from mucking up the display,
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* too.
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*
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* It turns out that the CPU which is allowed to print ends up pausing for the
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* right duration, whereas all the other CPUs pause for twice as long: once in
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* oops_enter(), once in oops_exit().
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* It turns out that the CPU which is allowed to print ends up pausing for
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* the right duration, whereas all the other CPUs pause for twice as long:
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* once in oops_enter(), once in oops_exit().
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*/
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void oops_enter(void)
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{
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debug_locks_off(); /* can't trust the integrity of the kernel anymore */
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/* can't trust the integrity of the kernel anymore: */
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debug_locks_off();
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do_oops_enter_exit();
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}
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