include/linux/tick.h

Source file repositories/reference/linux-study-clean/include/linux/tick.h

File Facts

System
Linux kernel
Corpus path
include/linux/tick.h
Extension
.h
Size
9724 bytes
Lines
313
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

static inline void tick_init(void) { }
static inline void tick_suspend_local(void) { }
static inline void tick_resume_local(void) { }
#endif /* !CONFIG_GENERIC_CLOCKEVENTS */

#if defined(CONFIG_GENERIC_CLOCKEVENTS) && defined(CONFIG_HOTPLUG_CPU)
extern int tick_cpu_dying(unsigned int cpu);
extern void tick_assert_timekeeping_handover(void);
#else
#define tick_cpu_dying	NULL
static inline void tick_assert_timekeeping_handover(void) { }
#endif

#if defined(CONFIG_GENERIC_CLOCKEVENTS) && defined(CONFIG_SUSPEND)
extern void tick_freeze(void);
extern void tick_unfreeze(void);
#else
static inline void tick_freeze(void) { }
static inline void tick_unfreeze(void) { }
#endif

#ifdef CONFIG_TICK_ONESHOT
extern void tick_irq_enter(void);
#  ifndef arch_needs_cpu
#   define arch_needs_cpu() (0)
#  endif
# else
static inline void tick_irq_enter(void) { }
#endif

#if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
extern void hotplug_cpu__broadcast_tick_pull(int dead_cpu);
#else
static inline void hotplug_cpu__broadcast_tick_pull(int dead_cpu) { }
#endif

enum tick_broadcast_mode {
	TICK_BROADCAST_OFF,
	TICK_BROADCAST_ON,
	TICK_BROADCAST_FORCE,
};

enum tick_broadcast_state {
	TICK_BROADCAST_EXIT,
	TICK_BROADCAST_ENTER,
};

extern struct static_key_false arch_needs_tick_broadcast;

#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
extern void tick_broadcast_control(enum tick_broadcast_mode mode);
#else
static inline void tick_broadcast_control(enum tick_broadcast_mode mode) { }
#endif /* BROADCAST */

#ifdef CONFIG_GENERIC_CLOCKEVENTS
extern int tick_broadcast_oneshot_control(enum tick_broadcast_state state);
#else
static inline int tick_broadcast_oneshot_control(enum tick_broadcast_state state)
{
	return 0;
}
#endif

static inline void tick_broadcast_enable(void)
{
	tick_broadcast_control(TICK_BROADCAST_ON);
}
static inline void tick_broadcast_disable(void)
{
	tick_broadcast_control(TICK_BROADCAST_OFF);
}
static inline void tick_broadcast_force(void)
{
	tick_broadcast_control(TICK_BROADCAST_FORCE);
}
static inline int tick_broadcast_enter(void)
{
	return tick_broadcast_oneshot_control(TICK_BROADCAST_ENTER);
}
static inline void tick_broadcast_exit(void)
{
	tick_broadcast_oneshot_control(TICK_BROADCAST_EXIT);
}

enum tick_dep_bits {
	TICK_DEP_BIT_POSIX_TIMER	= 0,
	TICK_DEP_BIT_PERF_EVENTS	= 1,
	TICK_DEP_BIT_SCHED		= 2,
	TICK_DEP_BIT_CLOCK_UNSTABLE	= 3,

Annotation

Implementation Notes