Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | #ifndef LINUX_HARDIRQ_H |
2 | #define LINUX_HARDIRQ_H | |
3 | ||
2d4b8473 | 4 | #include <linux/preempt_mask.h> |
fbb9ce95 | 5 | #include <linux/lockdep.h> |
6a60dd12 | 6 | #include <linux/ftrace_irq.h> |
dcbf832e | 7 | #include <linux/vtime.h> |
1da177e4 | 8 | |
1da177e4 | 9 | |
1da177e4 | 10 | extern void synchronize_irq(unsigned int irq); |
1da177e4 | 11 | |
127781d1 | 12 | #if defined(CONFIG_TINY_RCU) |
9b1d82fa PM |
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 | |
64db4cff PM |
23 | extern void rcu_nmi_enter(void); |
24 | extern void rcu_nmi_exit(void); | |
9b1d82fa | 25 | #endif |
2232c2d8 | 26 | |
de30a2b3 IM |
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 | */ | |
79bf2bb3 TG |
33 | #define __irq_enter() \ |
34 | do { \ | |
6a61671b | 35 | account_irq_enter_time(current); \ |
bdb43806 | 36 | preempt_count_add(HARDIRQ_OFFSET); \ |
79bf2bb3 TG |
37 | trace_hardirq_enter(); \ |
38 | } while (0) | |
39 | ||
40 | /* | |
41 | * Enter irq context (on NO_HZ, update jiffies): | |
42 | */ | |
dde4b2b5 | 43 | extern void irq_enter(void); |
de30a2b3 IM |
44 | |
45 | /* | |
46 | * Exit irq context without processing softirqs: | |
47 | */ | |
48 | #define __irq_exit() \ | |
49 | do { \ | |
50 | trace_hardirq_exit(); \ | |
6a61671b | 51 | account_irq_exit_time(current); \ |
bdb43806 | 52 | preempt_count_sub(HARDIRQ_OFFSET); \ |
1da177e4 LT |
53 | } while (0) |
54 | ||
de30a2b3 IM |
55 | /* |
56 | * Exit irq context and process softirqs if needed: | |
57 | */ | |
1da177e4 LT |
58 | extern void irq_exit(void); |
59 | ||
2a7b8df0 SR |
60 | #define nmi_enter() \ |
61 | do { \ | |
0f1ac8fd | 62 | lockdep_off(); \ |
2a7b8df0 SR |
63 | ftrace_nmi_enter(); \ |
64 | BUG_ON(in_nmi()); \ | |
bdb43806 | 65 | preempt_count_add(NMI_OFFSET + HARDIRQ_OFFSET); \ |
2a7b8df0 SR |
66 | rcu_nmi_enter(); \ |
67 | trace_hardirq_enter(); \ | |
17666f02 | 68 | } while (0) |
5f34fe1c | 69 | |
2a7b8df0 SR |
70 | #define nmi_exit() \ |
71 | do { \ | |
72 | trace_hardirq_exit(); \ | |
73 | rcu_nmi_exit(); \ | |
2a7b8df0 | 74 | BUG_ON(!in_nmi()); \ |
bdb43806 | 75 | preempt_count_sub(NMI_OFFSET + HARDIRQ_OFFSET); \ |
2a7b8df0 | 76 | ftrace_nmi_exit(); \ |
0f1ac8fd | 77 | lockdep_on(); \ |
17666f02 | 78 | } while (0) |
de30a2b3 | 79 | |
1da177e4 | 80 | #endif /* LINUX_HARDIRQ_H */ |