kernel/watchdog.c: control hard lockup detection default
[sfrench/cifs-2.6.git] / include / linux / nmi.h
1 /*
2  *  linux/include/linux/nmi.h
3  */
4 #ifndef LINUX_NMI_H
5 #define LINUX_NMI_H
6
7 #include <linux/sched.h>
8 #include <asm/irq.h>
9
10 /**
11  * touch_nmi_watchdog - restart NMI watchdog timeout.
12  * 
13  * If the architecture supports the NMI watchdog, touch_nmi_watchdog()
14  * may be used to reset the timeout - for code which intentionally
15  * disables interrupts for a long time. This call is stateless.
16  */
17 #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
18 #include <asm/nmi.h>
19 extern void touch_nmi_watchdog(void);
20 #else
21 static inline void touch_nmi_watchdog(void)
22 {
23         touch_softlockup_watchdog();
24 }
25 #endif
26
27 #if defined(CONFIG_HARDLOCKUP_DETECTOR)
28 extern void watchdog_enable_hardlockup_detector(bool val);
29 extern bool watchdog_hardlockup_detector_is_enabled(void);
30 #else
31 static inline void watchdog_enable_hardlockup_detector(bool val)
32 {
33 }
34 static inline bool watchdog_hardlockup_detector_is_enabled(void)
35 {
36         return true;
37 }
38 #endif
39
40 /*
41  * Create trigger_all_cpu_backtrace() out of the arch-provided
42  * base function. Return whether such support was available,
43  * to allow calling code to fall back to some other mechanism:
44  */
45 #ifdef arch_trigger_all_cpu_backtrace
46 static inline bool trigger_all_cpu_backtrace(void)
47 {
48         arch_trigger_all_cpu_backtrace(true);
49
50         return true;
51 }
52 static inline bool trigger_allbutself_cpu_backtrace(void)
53 {
54         arch_trigger_all_cpu_backtrace(false);
55         return true;
56 }
57 #else
58 static inline bool trigger_all_cpu_backtrace(void)
59 {
60         return false;
61 }
62 static inline bool trigger_allbutself_cpu_backtrace(void)
63 {
64         return false;
65 }
66 #endif
67
68 #ifdef CONFIG_LOCKUP_DETECTOR
69 int hw_nmi_is_cpu_stuck(struct pt_regs *);
70 u64 hw_nmi_get_sample_period(int watchdog_thresh);
71 extern int watchdog_user_enabled;
72 extern int watchdog_thresh;
73 extern int sysctl_softlockup_all_cpu_backtrace;
74 struct ctl_table;
75 extern int proc_dowatchdog(struct ctl_table *, int ,
76                            void __user *, size_t *, loff_t *);
77 #endif
78
79 #ifdef CONFIG_HAVE_ACPI_APEI_NMI
80 #include <asm/nmi.h>
81 #endif
82
83 #endif