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Merge tag 'writeback-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg...
[mirror_ubuntu-bionic-kernel.git] / include / linux / hardirq.h
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
10 extern void synchronize_irq(unsigned int irq);
11
12 #if defined(CONFIG_TINY_RCU)
13
14 static inline void rcu_nmi_enter(void)
15 {
16 }
17
18 static inline void rcu_nmi_exit(void)
19 {
20 }
21
22 #else
23 extern void rcu_nmi_enter(void);
24 extern 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 add_preempt_count(HARDIRQ_OFFSET); \
37 trace_hardirq_enter(); \
38 } while (0)
39
40 /*
41 * Enter irq context (on NO_HZ, update jiffies):
42 */
43 extern 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 sub_preempt_count(HARDIRQ_OFFSET); \
53 } while (0)
54
55 /*
56 * Exit irq context and process softirqs if needed:
57 */
58 extern void irq_exit(void);
59
60 #define nmi_enter() \
61 do { \
62 lockdep_off(); \
63 ftrace_nmi_enter(); \
64 BUG_ON(in_nmi()); \
65 add_preempt_count(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 sub_preempt_count(NMI_OFFSET + HARDIRQ_OFFSET); \
76 ftrace_nmi_exit(); \
77 lockdep_on(); \
78 } while (0)
79
80 #endif /* LINUX_HARDIRQ_H */