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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 #include <asm/hardirq.h>
9 
10 
11 extern void synchronize_irq(unsigned int irq);
12 extern void synchronize_hardirq(unsigned int irq);
13 
14 #if defined(CONFIG_TINY_RCU)
15 
rcu_nmi_enter(void)16 static inline void rcu_nmi_enter(void)
17 {
18 }
19 
rcu_nmi_exit(void)20 static inline void rcu_nmi_exit(void)
21 {
22 }
23 
24 #else
25 extern void rcu_nmi_enter(void);
26 extern void rcu_nmi_exit(void);
27 #endif
28 
29 /*
30  * It is safe to do non-atomic ops on ->hardirq_context,
31  * because NMI handlers may not preempt and the ops are
32  * always balanced, so the interrupted value of ->hardirq_context
33  * will always be restored.
34  */
35 #define __irq_enter()					\
36 	do {						\
37 		account_irq_enter_time(current);	\
38 		preempt_count_add(HARDIRQ_OFFSET);	\
39 		trace_hardirq_enter();			\
40 	} while (0)
41 
42 /*
43  * Enter irq context (on NO_HZ, update jiffies):
44  */
45 extern void irq_enter(void);
46 
47 /*
48  * Exit irq context without processing softirqs:
49  */
50 #define __irq_exit()					\
51 	do {						\
52 		trace_hardirq_exit();			\
53 		account_irq_exit_time(current);		\
54 		preempt_count_sub(HARDIRQ_OFFSET);	\
55 	} while (0)
56 
57 /*
58  * Exit irq context and process softirqs if needed:
59  */
60 extern void irq_exit(void);
61 
62 #define nmi_enter()						\
63 	do {							\
64 		lockdep_off();					\
65 		ftrace_nmi_enter();				\
66 		BUG_ON(in_nmi());				\
67 		preempt_count_add(NMI_OFFSET + HARDIRQ_OFFSET);	\
68 		rcu_nmi_enter();				\
69 		trace_hardirq_enter();				\
70 	} while (0)
71 
72 #define nmi_exit()						\
73 	do {							\
74 		trace_hardirq_exit();				\
75 		rcu_nmi_exit();					\
76 		BUG_ON(!in_nmi());				\
77 		preempt_count_sub(NMI_OFFSET + HARDIRQ_OFFSET);	\
78 		ftrace_nmi_exit();				\
79 		lockdep_on();					\
80 	} while (0)
81 
82 #endif /* LINUX_HARDIRQ_H */
83