cregit-Linux how code gets into the kernel

Release 4.12 include/linux/nmi.h

Directory: include/linux
/*
 *  linux/include/linux/nmi.h
 */
#ifndef LINUX_NMI_H

#define LINUX_NMI_H

#include <linux/sched.h>
#include <asm/irq.h>

#ifdef CONFIG_LOCKUP_DETECTOR
extern void touch_softlockup_watchdog_sched(void);
extern void touch_softlockup_watchdog(void);
extern void touch_softlockup_watchdog_sync(void);
extern void touch_all_softlockup_watchdogs(void);
extern int proc_dowatchdog_thresh(struct ctl_table *table, int write,
				  void __user *buffer,
				  size_t *lenp, loff_t *ppos);
extern unsigned int  softlockup_panic;
extern unsigned int  hardlockup_panic;
void lockup_detector_init(void);
#else

static inline void touch_softlockup_watchdog_sched(void) { }

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static inline void touch_softlockup_watchdog(void) { }

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static inline void touch_softlockup_watchdog_sync(void) { }

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static inline void touch_all_softlockup_watchdogs(void) { }

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static inline void lockup_detector_init(void) { }

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#endif #ifdef CONFIG_DETECT_HUNG_TASK void reset_hung_task_detector(void); #else
static inline void reset_hung_task_detector(void) { }

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#endif /* * The run state of the lockup detectors is controlled by the content of the * 'watchdog_enabled' variable. Each lockup detector has its dedicated bit - * bit 0 for the hard lockup detector and bit 1 for the soft lockup detector. * * 'watchdog_user_enabled', 'nmi_watchdog_enabled' and 'soft_watchdog_enabled' * are variables that are only used as an 'interface' between the parameters * in /proc/sys/kernel and the internal state bits in 'watchdog_enabled'. The * 'watchdog_thresh' variable is handled differently because its value is not * boolean, and the lockup detectors are 'suspended' while 'watchdog_thresh' * is equal zero. */ #define NMI_WATCHDOG_ENABLED_BIT 0 #define SOFT_WATCHDOG_ENABLED_BIT 1 #define NMI_WATCHDOG_ENABLED (1 << NMI_WATCHDOG_ENABLED_BIT) #define SOFT_WATCHDOG_ENABLED (1 << SOFT_WATCHDOG_ENABLED_BIT) /** * touch_nmi_watchdog - restart NMI watchdog timeout. * * If the architecture supports the NMI watchdog, touch_nmi_watchdog() * may be used to reset the timeout - for code which intentionally * disables interrupts for a long time. This call is stateless. */ #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR) #include <asm/nmi.h> extern void touch_nmi_watchdog(void); #else
static inline void touch_nmi_watchdog(void) { touch_softlockup_watchdog(); }

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Linus Torvalds18.33%150.00%
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#endif #if defined(CONFIG_HARDLOCKUP_DETECTOR) extern void hardlockup_detector_disable(void); #else
static inline void hardlockup_detector_disable(void) {}

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Ulrich Obergfell787.50%266.67%
Guenter Roeck112.50%133.33%
Total8100.00%3100.00%

#endif /* * Create trigger_all_cpu_backtrace() out of the arch-provided * base function. Return whether such support was available, * to allow calling code to fall back to some other mechanism: */ #ifdef arch_trigger_cpumask_backtrace
static inline bool trigger_all_cpu_backtrace(void) { arch_trigger_cpumask_backtrace(cpu_online_mask, false); return true; }

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Ingo Molnar736.84%125.00%
Aaron Tomlin736.84%125.00%
Chris Metcalf421.05%125.00%
Andrew Morton15.26%125.00%
Total19100.00%4100.00%


static inline bool trigger_allbutself_cpu_backtrace(void) { arch_trigger_cpumask_backtrace(cpu_online_mask, true); return true; }

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Chris Metcalf1052.63%150.00%
Aaron Tomlin947.37%150.00%
Total19100.00%2100.00%


static inline bool trigger_cpumask_backtrace(struct cpumask *mask) { arch_trigger_cpumask_backtrace(mask, false); return true; }

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static inline bool trigger_single_cpu_backtrace(int cpu) { arch_trigger_cpumask_backtrace(cpumask_of(cpu), false); return true; }

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Chris Metcalf1669.57%133.33%
Ingo Molnar521.74%133.33%
Aaron Tomlin28.70%133.33%
Total23100.00%3100.00%

/* generic implementation */ void nmi_trigger_cpumask_backtrace(const cpumask_t *mask, bool exclude_self, void (*raise)(cpumask_t *mask)); bool nmi_cpu_backtrace(struct pt_regs *regs); #else
static inline bool trigger_all_cpu_backtrace(void) { return false; }

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Ingo Molnar1191.67%150.00%
Andrew Morton18.33%150.00%
Total12100.00%2100.00%


static inline bool trigger_allbutself_cpu_backtrace(void) { return false; }

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Aaron Tomlin12100.00%1100.00%
Total12100.00%1100.00%


static inline bool trigger_cpumask_backtrace(struct cpumask *mask) { return false; }

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Chris Metcalf15100.00%1100.00%
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static inline bool trigger_single_cpu_backtrace(int cpu) { return false; }

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Chris Metcalf13100.00%1100.00%
Total13100.00%1100.00%

#endif #ifdef CONFIG_LOCKUP_DETECTOR u64 hw_nmi_get_sample_period(int watchdog_thresh); extern int nmi_watchdog_enabled; extern int soft_watchdog_enabled; extern int watchdog_user_enabled; extern int watchdog_thresh; extern unsigned long watchdog_enabled; extern unsigned long *watchdog_cpumask_bits; extern atomic_t watchdog_park_in_progress; #ifdef CONFIG_SMP extern int sysctl_softlockup_all_cpu_backtrace; extern int sysctl_hardlockup_all_cpu_backtrace; #else #define sysctl_softlockup_all_cpu_backtrace 0 #define sysctl_hardlockup_all_cpu_backtrace 0 #endif extern bool is_hardlockup(void); struct ctl_table; extern int proc_watchdog(struct ctl_table *, int , void __user *, size_t *, loff_t *); extern int proc_nmi_watchdog(struct ctl_table *, int , void __user *, size_t *, loff_t *); extern int proc_soft_watchdog(struct ctl_table *, int , void __user *, size_t *, loff_t *); extern int proc_watchdog_thresh(struct ctl_table *, int , void __user *, size_t *, loff_t *); extern int proc_watchdog_cpumask(struct ctl_table *, int, void __user *, size_t *, loff_t *); extern int lockup_detector_suspend(void); extern void lockup_detector_resume(void); #else
static inline int lockup_detector_suspend(void) { return 0; }

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static inline void lockup_detector_resume(void) { }

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Ulrich Obergfell8100.00%2100.00%
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#endif #ifdef CONFIG_HAVE_ACPI_APEI_NMI #include <asm/nmi.h> #endif #endif

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Ingo Molnar17727.92%39.38%
Ulrich Obergfell15023.66%721.88%
Chris Metcalf11518.14%26.25%
Babu Moger446.94%13.12%
Don Zickus436.78%618.75%
Aaron Tomlin345.36%26.25%
Russell King264.10%13.12%
Linus Torvalds142.21%13.12%
Tomasz Nowicki81.26%13.12%
Andrew Morton71.10%13.12%
Mandeep Singh Baines60.95%26.25%
Jiri Kosina40.63%13.12%
Michal Schmidt30.47%13.12%
Frédéric Weisbecker10.16%13.12%
Américo Wang10.16%13.12%
Guenter Roeck10.16%13.12%
Total634100.00%32100.00%
Directory: include/linux
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