Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
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linux
1#ifndef LINUX_HARDIRQ_H
2#define LINUX_HARDIRQ_H
3
4#include <linux/preempt_mask.h>
5#include <linux/lockdep.h>
6#include <linux/ftrace_irq.h>
7#include <linux/vtime.h>
8
9
10extern void synchronize_irq(unsigned int irq);
11
12#if defined(CONFIG_TINY_RCU)
13
14static inline void rcu_nmi_enter(void)
15{
16}
17
18static inline void rcu_nmi_exit(void)
19{
20}
21
22#else
23extern void rcu_nmi_enter(void);
24extern void rcu_nmi_exit(void);
25#endif
26
27/*
28 * It is safe to do non-atomic ops on ->hardirq_context,
29 * because NMI handlers may not preempt and the ops are
30 * always balanced, so the interrupted value of ->hardirq_context
31 * will always be restored.
32 */
33#define __irq_enter() \
34 do { \
35 account_irq_enter_time(current); \
36 preempt_count_add(HARDIRQ_OFFSET); \
37 trace_hardirq_enter(); \
38 } while (0)
39
40/*
41 * Enter irq context (on NO_HZ, update jiffies):
42 */
43extern void irq_enter(void);
44
45/*
46 * Exit irq context without processing softirqs:
47 */
48#define __irq_exit() \
49 do { \
50 trace_hardirq_exit(); \
51 account_irq_exit_time(current); \
52 preempt_count_sub(HARDIRQ_OFFSET); \
53 } while (0)
54
55/*
56 * Exit irq context and process softirqs if needed:
57 */
58extern void irq_exit(void);
59
60#define nmi_enter() \
61 do { \
62 lockdep_off(); \
63 ftrace_nmi_enter(); \
64 BUG_ON(in_nmi()); \
65 preempt_count_add(NMI_OFFSET + HARDIRQ_OFFSET); \
66 rcu_nmi_enter(); \
67 trace_hardirq_enter(); \
68 } while (0)
69
70#define nmi_exit() \
71 do { \
72 trace_hardirq_exit(); \
73 rcu_nmi_exit(); \
74 BUG_ON(!in_nmi()); \
75 preempt_count_sub(NMI_OFFSET + HARDIRQ_OFFSET); \
76 ftrace_nmi_exit(); \
77 lockdep_on(); \
78 } while (0)
79
80#endif /* LINUX_HARDIRQ_H */