include/linux/hardirq.h

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

File Facts

System
Linux kernel
Corpus path
include/linux/hardirq.h
Extension
.h
Size
3327 bytes
Lines
144
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 __rcu_irq_enter_check_tick(void) { }
#endif

static __always_inline void rcu_irq_enter_check_tick(void)
{
	if (context_tracking_enabled())
		__rcu_irq_enter_check_tick();
}

/*
 * It is safe to do non-atomic ops on ->hardirq_context,
 * because NMI handlers may not preempt and the ops are
 * always balanced, so the interrupted value of ->hardirq_context
 * will always be restored.
 */
#define __irq_enter()					\
	do {						\
		preempt_count_add(HARDIRQ_OFFSET);	\
		lockdep_hardirq_enter();		\
		account_hardirq_enter(current);		\
	} while (0)

/*
 * Like __irq_enter() without time accounting for fast
 * interrupts, e.g. reschedule IPI where time accounting
 * is more expensive than the actual interrupt.
 */
#define __irq_enter_raw()				\
	do {						\
		preempt_count_add(HARDIRQ_OFFSET);	\
		lockdep_hardirq_enter();		\
	} while (0)

/*
 * Enter irq context (on NO_HZ, update jiffies):
 */
void irq_enter(void);
/*
 * Like irq_enter(), but RCU is already watching.
 */
void irq_enter_rcu(void);

/*
 * Exit irq context without processing softirqs:
 */
#define __irq_exit()					\
	do {						\
		account_hardirq_exit(current);		\
		lockdep_hardirq_exit();			\
		preempt_count_sub(HARDIRQ_OFFSET);	\
	} while (0)

/*
 * Like __irq_exit() without time accounting
 */
#define __irq_exit_raw()				\
	do {						\
		lockdep_hardirq_exit();			\
		preempt_count_sub(HARDIRQ_OFFSET);	\
	} while (0)

/*
 * Exit irq context and process softirqs if needed:
 */
void irq_exit(void);

/*
 * Like irq_exit(), but return with RCU watching.
 */
void irq_exit_rcu(void);

#ifndef arch_nmi_enter
#define arch_nmi_enter()	do { } while (0)
#define arch_nmi_exit()		do { } while (0)
#endif

/*
 * NMI vs Tracing
 * --------------
 *
 * We must not land in a tracer until (or after) we've changed preempt_count
 * such that in_nmi() becomes true. To that effect all NMI C entry points must
 * be marked 'notrace' and call nmi_enter() as soon as possible.
 */

/*
 * nmi_enter() can nest up to 15 times; see NMI_BITS.
 */
#define __nmi_enter()						\
	do {							\

Annotation

Implementation Notes