/*
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/*
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* linux/kernel/panic.c
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* linux/kernel/panic.c
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*
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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* Copyright (C) 1991, 1992 Linus Torvalds
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*/
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*/
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/*
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/*
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* This function is used through-out the kernel (including mm and fs)
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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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* to indicate a major problem.
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*/
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*/
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#include <linux/config.h>
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#include <linux/config.h>
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#include <linux/sched.h>
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#include <linux/sched.h>
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#include <linux/delay.h>
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#include <linux/delay.h>
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#include <linux/reboot.h>
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#include <linux/reboot.h>
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#include <linux/notifier.h>
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#include <linux/notifier.h>
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#include <linux/init.h>
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#include <linux/init.h>
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#include <linux/sysrq.h>
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#include <linux/sysrq.h>
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#include <linux/interrupt.h>
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#include <linux/interrupt.h>
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#include <linux/console.h>
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#include <linux/console.h>
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asmlinkage void sys_sync(void); /* it's really int */
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asmlinkage void sys_sync(void); /* it's really int */
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int panic_timeout;
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int panic_timeout;
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struct notifier_block *panic_notifier_list;
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struct notifier_block *panic_notifier_list;
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static int __init panic_setup(char *str)
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static int __init panic_setup(char *str)
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{
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{
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panic_timeout = simple_strtoul(str, NULL, 0);
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panic_timeout = simple_strtoul(str, NULL, 0);
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return 1;
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return 1;
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}
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}
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__setup("panic=", panic_setup);
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__setup("panic=", panic_setup);
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int machine_paniced;
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int machine_paniced;
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/**
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/**
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* panic - halt the system
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* panic - halt the system
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* @fmt: The text string to print
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* @fmt: The text string to print
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*
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*
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* Display a message, then perform cleanups. Functions in the panic
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* Display a message, then perform cleanups. Functions in the panic
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* notifier list are called after the filesystem cache is flushed (when possible).
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* notifier list are called after the filesystem cache is flushed (when possible).
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*
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*
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* This function never returns.
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* This function never returns.
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*/
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*/
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NORET_TYPE void panic(const char * fmt, ...)
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NORET_TYPE void panic(const char * fmt, ...)
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{
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{
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static char buf[1024];
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static char buf[1024];
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va_list args;
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va_list args;
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#if defined(CONFIG_ARCH_S390)
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#if defined(CONFIG_ARCH_S390)
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unsigned long caller = (unsigned long) __builtin_return_address(0);
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unsigned long caller = (unsigned long) __builtin_return_address(0);
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#endif
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#endif
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#ifdef CONFIG_VT
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#ifdef CONFIG_VT
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disable_console_blank();
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disable_console_blank();
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#endif
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#endif
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machine_paniced = 1;
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machine_paniced = 1;
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bust_spinlocks(1);
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bust_spinlocks(1);
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va_start(args, fmt);
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va_start(args, fmt);
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vsprintf(buf, fmt, args);
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vsprintf(buf, fmt, args);
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va_end(args);
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va_end(args);
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printk(KERN_EMERG "Kernel panic: %s\n",buf);
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printk(KERN_EMERG "Kernel panic: %s\n",buf);
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if (in_interrupt())
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if (in_interrupt())
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printk(KERN_EMERG "In interrupt handler - not syncing\n");
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printk(KERN_EMERG "In interrupt handler - not syncing\n");
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else if (!current->pid)
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else if (!current->pid)
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printk(KERN_EMERG "In idle task - not syncing\n");
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printk(KERN_EMERG "In idle task - not syncing\n");
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else
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else
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sys_sync();
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sys_sync();
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bust_spinlocks(0);
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bust_spinlocks(0);
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#ifdef CONFIG_SMP
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#ifdef CONFIG_SMP
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smp_send_stop();
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smp_send_stop();
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#endif
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#endif
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notifier_call_chain(&panic_notifier_list, 0, NULL);
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notifier_call_chain(&panic_notifier_list, 0, NULL);
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if (panic_timeout > 0)
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if (panic_timeout > 0)
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{
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{
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/*
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/*
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* Delay timeout seconds before rebooting the machine.
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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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* We can't use the "normal" timers since we just panicked..
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*/
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*/
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printk(KERN_EMERG "Rebooting in %d seconds..",panic_timeout);
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printk(KERN_EMERG "Rebooting in %d seconds..",panic_timeout);
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mdelay(panic_timeout*1000);
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mdelay(panic_timeout*1000);
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/*
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/*
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* Should we run the reboot notifier. For the moment Im
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* Should we run the reboot notifier. For the moment Im
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* choosing not too. It might crash, be corrupt or do
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* choosing not too. It might crash, be corrupt or do
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* more harm than good for other reasons.
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* more harm than good for other reasons.
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*/
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*/
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machine_restart(NULL);
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machine_restart(NULL);
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}
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}
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#ifdef __sparc__
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#ifdef __sparc__
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{
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{
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extern int stop_a_enabled;
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extern int stop_a_enabled;
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/* Make sure the user can actually press L1-A */
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/* Make sure the user can actually press L1-A */
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stop_a_enabled = 1;
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stop_a_enabled = 1;
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printk("Press L1-A to return to the boot prom\n");
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printk("Press L1-A to return to the boot prom\n");
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}
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}
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#endif
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#endif
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#if defined(CONFIG_ARCH_S390)
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#if defined(CONFIG_ARCH_S390)
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disabled_wait(caller);
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disabled_wait(caller);
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#endif
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#endif
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sti();
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sti();
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for(;;) {
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for(;;) {
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#if defined(CONFIG_X86) && defined(CONFIG_VT)
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#if defined(CONFIG_X86) && defined(CONFIG_VT)
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extern void panic_blink(void);
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extern void panic_blink(void);
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panic_blink();
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panic_blink();
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#endif
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#endif
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CHECK_EMERGENCY_SYNC
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CHECK_EMERGENCY_SYNC
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}
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}
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}
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}
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/**
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/**
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* print_tainted - return a string to represent the kernel taint state.
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* print_tainted - return a string to represent the kernel taint state.
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*
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*
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* The string is overwritten by the next call to print_taint().
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* The string is overwritten by the next call to print_taint().
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*/
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*/
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const char *print_tainted()
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const char *print_tainted()
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{
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{
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static char buf[20];
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static char buf[20];
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if (tainted) {
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if (tainted) {
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snprintf(buf, sizeof(buf), "Tainted: %c%c",
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snprintf(buf, sizeof(buf), "Tainted: %c%c",
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tainted & 1 ? 'P' : 'G',
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tainted & 1 ? 'P' : 'G',
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tainted & 2 ? 'F' : ' ');
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tainted & 2 ? 'F' : ' ');
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}
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}
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else
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else
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snprintf(buf, sizeof(buf), "Not tainted");
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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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}
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int tainted = 0;
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int tainted = 0;
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/*
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/*
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* A BUG() call in an inline function in a header should be avoided,
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* A BUG() call in an inline function in a header should be avoided,
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* because it can seriously bloat the kernel. So here we have
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* because it can seriously bloat the kernel. So here we have
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* helper functions.
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* helper functions.
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* We lose the BUG()-time file-and-line info this way, but it's
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* We lose the BUG()-time file-and-line info this way, but it's
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* usually not very useful from an inline anyway. The backtrace
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* usually not very useful from an inline anyway. The backtrace
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* tells us what we want to know.
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* tells us what we want to know.
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*/
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*/
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void __out_of_line_bug(int line)
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void __out_of_line_bug(int line)
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{
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{
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printk("kernel BUG in header file at line %d\n", line);
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printk("kernel BUG in header file at line %d\n", line);
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BUG();
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BUG();
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/* Satisfy __attribute__((noreturn)) */
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/* Satisfy __attribute__((noreturn)) */
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for ( ; ; )
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for ( ; ; )
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;
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;
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}
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}
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