cregit-Linux how code gets into the kernel

Release 4.15 include/linux/nmi.h

Directory: include/linux
/* SPDX-License-Identifier: GPL-2.0 */
/*
 *  linux/include/linux/nmi.h
 */
#ifndef LINUX_NMI_H

#define LINUX_NMI_H

#include <linux/sched.h>
#include <asm/irq.h>
#if defined(CONFIG_HAVE_NMI_WATCHDOG)
#include <asm/nmi.h>
#endif

#ifdef CONFIG_LOCKUP_DETECTOR
void lockup_detector_init(void);
void lockup_detector_soft_poweroff(void);
void lockup_detector_cleanup(void);
bool is_hardlockup(void);

extern int watchdog_user_enabled;
extern int nmi_watchdog_user_enabled;
extern int soft_watchdog_user_enabled;
extern int watchdog_thresh;
extern unsigned long watchdog_enabled;

extern struct cpumask watchdog_cpumask;
extern unsigned long *watchdog_cpumask_bits;
#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 /* !CONFIG_SMP */

#else /* CONFIG_LOCKUP_DETECTOR */

static inline void lockup_detector_init(void) { }

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Nicholas Piggin8100.00%1100.00%
Total8100.00%1100.00%


static inline void lockup_detector_soft_poweroff(void) { }

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Thomas Gleixner8100.00%1100.00%
Total8100.00%1100.00%


static inline void lockup_detector_cleanup(void) { }

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Thomas Gleixner8100.00%1100.00%
Total8100.00%1100.00%

#endif /* !CONFIG_LOCKUP_DETECTOR */ #ifdef CONFIG_SOFTLOCKUP_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 unsigned int softlockup_panic; #else
static inline void touch_softlockup_watchdog_sched(void) { }

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Ingo Molnar8100.00%1100.00%
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static inline void touch_softlockup_watchdog(void) { }

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Ingo Molnar8100.00%1100.00%
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static inline void touch_softlockup_watchdog_sync(void) { }

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Ingo Molnar8100.00%1100.00%
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static inline void touch_all_softlockup_watchdogs(void) { }

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Ingo Molnar8100.00%1100.00%
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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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Ingo Molnar8100.00%1100.00%
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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_user_enabled' and * 'soft_watchdog_user_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) #if defined(CONFIG_HARDLOCKUP_DETECTOR) extern void hardlockup_detector_disable(void); extern unsigned int hardlockup_panic; #else
static inline void hardlockup_detector_disable(void) {}

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Ingo Molnar675.00%150.00%
Nicholas Piggin225.00%150.00%
Total8100.00%2100.00%

#endif #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR) # define NMI_WATCHDOG_SYSCTL_PERM 0644 #else # define NMI_WATCHDOG_SYSCTL_PERM 0444 #endif #if defined(CONFIG_HARDLOCKUP_DETECTOR_PERF) extern void arch_touch_nmi_watchdog(void); extern void hardlockup_detector_perf_stop(void); extern void hardlockup_detector_perf_restart(void); extern void hardlockup_detector_perf_disable(void); extern void hardlockup_detector_perf_enable(void); extern void hardlockup_detector_perf_cleanup(void); extern int hardlockup_detector_perf_init(void); #else
static inline void hardlockup_detector_perf_stop(void) { }

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Peter Zijlstra8100.00%1100.00%
Total8100.00%1100.00%


static inline void hardlockup_detector_perf_restart(void) { }

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Peter Zijlstra8100.00%1100.00%
Total8100.00%1100.00%


static inline void hardlockup_detector_perf_disable(void) { }

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Thomas Gleixner8100.00%1100.00%
Total8100.00%1100.00%


static inline void hardlockup_detector_perf_enable(void) { }

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Thomas Gleixner8100.00%1100.00%
Total8100.00%1100.00%


static inline void hardlockup_detector_perf_cleanup(void) { }

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Thomas Gleixner8100.00%1100.00%
Total8100.00%1100.00%

# if !defined(CONFIG_HAVE_NMI_WATCHDOG)
static inline int hardlockup_detector_perf_init(void) { return -ENODEV; }

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Thomas Gleixner13100.00%1100.00%
Total13100.00%1100.00%


static inline void arch_touch_nmi_watchdog(void) {}

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Ulrich Obergfell675.00%133.33%
Guenter Roeck112.50%133.33%
Nicholas Piggin112.50%133.33%
Total8100.00%3100.00%

# else
static inline int hardlockup_detector_perf_init(void) { return 0; }

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Thomas Gleixner12100.00%1100.00%
Total12100.00%1100.00%

# endif #endif void watchdog_nmi_stop(void); void watchdog_nmi_start(void); int watchdog_nmi_probe(void); /** * 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. */
static inline void touch_nmi_watchdog(void) { arch_touch_nmi_watchdog(); touch_softlockup_watchdog(); }

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Nicholas Piggin15100.00%1100.00%
Total15100.00%1100.00%

/* * 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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Aaron Tomlin736.84%125.00%
Ingo Molnar736.84%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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Chris Metcalf22100.00%1100.00%
Total22100.00%1100.00%


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%
Total15100.00%1100.00%


static inline bool trigger_single_cpu_backtrace(int cpu) { return false; }

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

#endif #ifdef CONFIG_HARDLOCKUP_DETECTOR_PERF u64 hw_nmi_get_sample_period(int watchdog_thresh); #endif #if defined(CONFIG_HARDLOCKUP_CHECK_TIMESTAMP) && \ defined(CONFIG_HARDLOCKUP_DETECTOR) void watchdog_update_hrtimer_threshold(u64 period); #else
static inline void watchdog_update_hrtimer_threshold(u64 period) { }

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Thomas Gleixner9100.00%1100.00%
Total9100.00%1100.00%

#endif 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 *); #ifdef CONFIG_HAVE_ACPI_APEI_NMI #include <asm/nmi.h> #endif #endif

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PersonTokensPropCommitsCommitProp
Thomas Gleixner24630.15%1131.43%
Ingo Molnar12715.56%38.57%
Chris Metcalf10913.36%25.71%
Ulrich Obergfell10212.50%25.71%
Nicholas Piggin718.70%25.71%
Peter Zijlstra303.68%12.86%
Aaron Tomlin303.68%12.86%
Don Zickus283.43%411.43%
Russell King263.19%12.86%
Babu Moger161.96%12.86%
Linus Torvalds121.47%12.86%
Tomasz Nowicki80.98%12.86%
Andrew Morton40.49%12.86%
Michal Schmidt30.37%12.86%
Mandeep Singh Baines20.25%12.86%
Guenter Roeck10.12%12.86%
Greg Kroah-Hartman10.12%12.86%
Total816100.00%35100.00%
Directory: include/linux
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