aboutsummaryrefslogtreecommitdiffstats
path: root/include/linux/hardirq.h
blob: cba442ec3c66583a7aceefbbc9ff9eca5fee1563 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
#ifndef LINUX_HARDIRQ_H
#define LINUX_HARDIRQ_H

#include <linux/preempt_mask.h>
#include <linux/lockdep.h>
#include <linux/ftrace_irq.h>
#include <linux/vtime.h>
#include <asm/hardirq.h>


extern void synchronize_irq(unsigned int irq);
extern void synchronize_hardirq(unsigned int irq);

#if defined(CONFIG_TINY_RCU)

static inline void rcu_nmi_enter(void)
{
}

static inline void rcu_nmi_exit(void)
{
}

#else
extern void rcu_nmi_enter(void);
extern void rcu_nmi_exit(void);
#endif

/*
 * 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 {						\
		account_irq_enter_time(current);	\
		preempt_count_add(HARDIRQ_OFFSET);	\
		trace_hardirq_enter();			\
	} while (0)

/*
 * Enter irq context (on NO_HZ, update jiffies):
 */
extern void irq_enter(void);

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

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

#define nmi_enter()						\
	do {							\
		lockdep_off();					\
		ftrace_nmi_enter();				\
		BUG_ON(in_nmi());				\
		preempt_count_add(NMI_OFFSET + HARDIRQ_OFFSET);	\
		rcu_nmi_enter();				\
		trace_hardirq_enter();				\
	} while (0)

#define nmi_exit()						\
	do {							\
		trace_hardirq_exit();				\
		rcu_nmi_exit();					\
		BUG_ON(!in_nmi());				\
		preempt_count_sub(NMI_OFFSET + HARDIRQ_OFFSET);	\
		ftrace_nmi_exit();				\
		lockdep_on();					\
	} while (0)

#endif /* LINUX_HARDIRQ_H */