include/linux/panic.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef _LINUX_PANIC_H
0003 #define _LINUX_PANIC_H
0004
0005 #include <linux/compiler_attributes.h>
0006 #include <linux/types.h>
0007
0008 struct pt_regs;
0009
0010 extern long (*panic_blink)(int state);
0011 __printf(1, 2)
0012 void panic(const char *fmt, ...) __noreturn __cold;
0013 void nmi_panic(struct pt_regs *regs, const char *msg);
0014 extern void oops_enter(void);
0015 extern void oops_exit(void);
0016 extern bool oops_may_print(void);
0017
0018 extern int panic_timeout;
0019 extern unsigned long panic_print;
0020 extern int panic_on_oops;
0021 extern int panic_on_unrecovered_nmi;
0022 extern int panic_on_io_nmi;
0023 extern int panic_on_warn;
0024
0025 extern unsigned long panic_on_taint;
0026 extern bool panic_on_taint_nousertaint;
0027
0028 extern int sysctl_panic_on_rcu_stall;
0029 extern int sysctl_max_rcu_stall_to_panic;
0030 extern int sysctl_panic_on_stackoverflow;
0031
0032 extern bool crash_kexec_post_notifiers;
0033
0034 /*
0035  * panic_cpu is used for synchronizing panic() and crash_kexec() execution. It
0036  * holds a CPU number which is executing panic() currently. A value of
0037  * PANIC_CPU_INVALID means no CPU has entered panic() or crash_kexec().
0038  */
0039 extern atomic_t panic_cpu;
0040 #define PANIC_CPU_INVALID   -1
0041
0042 /*
0043  * Only to be used by arch init code. If the user over-wrote the default
0044  * CONFIG_PANIC_TIMEOUT, honor it.
0045  */
0046 static inline void set_arch_panic_timeout(int timeout, int arch_default_timeout)
0047 {
0048     if (panic_timeout == arch_default_timeout)
0049         panic_timeout = timeout;
0050 }
0051
0052 /* This cannot be an enum because some may be used in assembly source. */
0053 #define TAINT_PROPRIETARY_MODULE    0
0054 #define TAINT_FORCED_MODULE     1
0055 #define TAINT_CPU_OUT_OF_SPEC       2
0056 #define TAINT_FORCED_RMMOD      3
0057 #define TAINT_MACHINE_CHECK     4
0058 #define TAINT_BAD_PAGE          5
0059 #define TAINT_USER          6
0060 #define TAINT_DIE           7
0061 #define TAINT_OVERRIDDEN_ACPI_TABLE 8
0062 #define TAINT_WARN          9
0063 #define TAINT_CRAP          10
0064 #define TAINT_FIRMWARE_WORKAROUND   11
0065 #define TAINT_OOT_MODULE        12
0066 #define TAINT_UNSIGNED_MODULE       13
0067 #define TAINT_SOFTLOCKUP        14
0068 #define TAINT_LIVEPATCH         15
0069 #define TAINT_AUX           16
0070 #define TAINT_RANDSTRUCT        17
0071 #define TAINT_TEST          18
0072 #define TAINT_FLAGS_COUNT       19
0073 #define TAINT_FLAGS_MAX         ((1UL << TAINT_FLAGS_COUNT) - 1)
0074
0075 struct taint_flag {
0076     char c_true;    /* character printed when tainted */
0077     char c_false;   /* character printed when not tainted */
0078     bool module;    /* also show as a per-module taint flag */
0079 };
0080
0081 extern const struct taint_flag taint_flags[TAINT_FLAGS_COUNT];
0082
0083 enum lockdep_ok {
0084     LOCKDEP_STILL_OK,
0085     LOCKDEP_NOW_UNRELIABLE,
0086 };
0087
0088 extern const char *print_tainted(void);
0089 extern void add_taint(unsigned flag, enum lockdep_ok);
0090 extern int test_taint(unsigned flag);
0091 extern unsigned long get_taint(void);
0092
0093 #endif  /* _LINUX_PANIC_H */