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  */
set_arch_panic_timeout(int timeout,int arch_default_timeout)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 */
99