include/linux/panic.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_PANIC_H
   3 #define _LINUX_PANIC_H
   4
   5 #include <linux/compiler_attributes.h>
   6 #include <linux/types.h>
   7
   8 struct pt_regs;
   9
  10 extern long (*panic_blink)(int state);
  11 __printf(1, 2)
  12 void panic(const char *fmt, ...) __noreturn __cold;
  13 void nmi_panic(struct pt_regs *regs, const char *msg);
  14 extern void oops_enter(void);
  15 extern void oops_exit(void);
  16 extern bool oops_may_print(void);
  17
  18 #ifdef CONFIG_SMP
  19 extern unsigned int sysctl_oops_all_cpu_backtrace;
  20 #else
  21 #define sysctl_oops_all_cpu_backtrace 0
  22 #endif /* CONFIG_SMP */
  23
  24 extern int panic_timeout;
  25 extern unsigned long panic_print;
  26 extern int panic_on_oops;
  27 extern int panic_on_unrecovered_nmi;
  28 extern int panic_on_io_nmi;
  29 extern int panic_on_warn;
  30
  31 extern unsigned long panic_on_taint;
  32 extern bool panic_on_taint_nousertaint;
  33
  34 extern int sysctl_panic_on_rcu_stall;
  35 extern int sysctl_max_rcu_stall_to_panic;
  36 extern int sysctl_panic_on_stackoverflow;
  37
  38 extern bool crash_kexec_post_notifiers;
  39
  40 /*
  41  * panic_cpu is used for synchronizing panic() and crash_kexec() execution. It
  42  * holds a CPU number which is executing panic() currently. A value of
  43  * PANIC_CPU_INVALID means no CPU has entered panic() or crash_kexec().
  44  */
  45 extern atomic_t panic_cpu;
  46 #define PANIC_CPU_INVALID       -1
  47
  48 /*
  49  * Only to be used by arch init code. If the user over-wrote the default
  50  * CONFIG_PANIC_TIMEOUT, honor it.
  51  */
  52 static inline void set_arch_panic_timeout(int timeout, int arch_default_timeout)
  53 {
  54         if (panic_timeout == arch_default_timeout)
  55                 panic_timeout = timeout;
  56 }
  57
  58 /* This cannot be an enum because some may be used in assembly source. */
  59 #define TAINT_PROPRIETARY_MODULE        0
  60 #define TAINT_FORCED_MODULE             1
  61 #define TAINT_CPU_OUT_OF_SPEC           2
  62 #define TAINT_FORCED_RMMOD              3
  63 #define TAINT_MACHINE_CHECK             4
  64 #define TAINT_BAD_PAGE                  5
  65 #define TAINT_USER                      6
  66 #define TAINT_DIE                       7
  67 #define TAINT_OVERRIDDEN_ACPI_TABLE     8
  68 #define TAINT_WARN                      9
  69 #define TAINT_CRAP                      10
  70 #define TAINT_FIRMWARE_WORKAROUND       11
  71 #define TAINT_OOT_MODULE                12
  72 #define TAINT_UNSIGNED_MODULE           13
  73 #define TAINT_SOFTLOCKUP                14
  74 #define TAINT_LIVEPATCH                 15
  75 #define TAINT_AUX                       16
  76 #define TAINT_RANDSTRUCT                17
  77 #define TAINT_FLAGS_COUNT               18
  78 #define TAINT_FLAGS_MAX                 ((1UL << TAINT_FLAGS_COUNT) - 1)
  79
  80 struct taint_flag {
  81         char c_true;    /* character printed when tainted */
  82         char c_false;   /* character printed when not tainted */
  83         bool module;    /* also show as a per-module taint flag */
  84 };
  85
  86 extern const struct taint_flag taint_flags[TAINT_FLAGS_COUNT];
  87
  88 enum lockdep_ok {
  89         LOCKDEP_STILL_OK,
  90         LOCKDEP_NOW_UNRELIABLE,
  91 };
  92
  93 extern const char *print_tainted(void);
  94 extern void add_taint(unsigned flag, enum lockdep_ok);
  95 extern int test_taint(unsigned flag);
  96 extern unsigned long get_taint(void);
  97
  98 #endif  /* _LINUX_PANIC_H */