rcu: remove all rcu head initializations, except on_stack initializations
[linux-2.6.git] / include / linux / irqflags.h
1 /*
2  * include/linux/irqflags.h
3  *
4  * IRQ flags tracing: follow the state of the hardirq and softirq flags and
5  * provide callbacks for transitions between ON and OFF states.
6  *
7  * This file gets included from lowlevel asm headers too, to provide
8  * wrapped versions of the local_irq_*() APIs, based on the
9  * raw_local_irq_*() macros from the lowlevel headers.
10  */
11 #ifndef _LINUX_TRACE_IRQFLAGS_H
12 #define _LINUX_TRACE_IRQFLAGS_H
13
14 #include <linux/typecheck.h>
15
16 #ifdef CONFIG_TRACE_IRQFLAGS
17   extern void trace_softirqs_on(unsigned long ip);
18   extern void trace_softirqs_off(unsigned long ip);
19   extern void trace_hardirqs_on(void);
20   extern void trace_hardirqs_off(void);
21 # define trace_hardirq_context(p)       ((p)->hardirq_context)
22 # define trace_softirq_context(p)       ((p)->softirq_context)
23 # define trace_hardirqs_enabled(p)      ((p)->hardirqs_enabled)
24 # define trace_softirqs_enabled(p)      ((p)->softirqs_enabled)
25 # define trace_hardirq_enter()  do { current->hardirq_context++; } while (0)
26 # define trace_hardirq_exit()   do { current->hardirq_context--; } while (0)
27 # define lockdep_softirq_enter()        do { current->softirq_context++; } while (0)
28 # define lockdep_softirq_exit() do { current->softirq_context--; } while (0)
29 # define INIT_TRACE_IRQFLAGS    .softirqs_enabled = 1,
30 #else
31 # define trace_hardirqs_on()            do { } while (0)
32 # define trace_hardirqs_off()           do { } while (0)
33 # define trace_softirqs_on(ip)          do { } while (0)
34 # define trace_softirqs_off(ip)         do { } while (0)
35 # define trace_hardirq_context(p)       0
36 # define trace_softirq_context(p)       0
37 # define trace_hardirqs_enabled(p)      0
38 # define trace_softirqs_enabled(p)      0
39 # define trace_hardirq_enter()          do { } while (0)
40 # define trace_hardirq_exit()           do { } while (0)
41 # define lockdep_softirq_enter()        do { } while (0)
42 # define lockdep_softirq_exit()         do { } while (0)
43 # define INIT_TRACE_IRQFLAGS
44 #endif
45
46 #if defined(CONFIG_IRQSOFF_TRACER) || \
47         defined(CONFIG_PREEMPT_TRACER)
48  extern void stop_critical_timings(void);
49  extern void start_critical_timings(void);
50 #else
51 # define stop_critical_timings() do { } while (0)
52 # define start_critical_timings() do { } while (0)
53 #endif
54
55 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
56
57 #include <asm/irqflags.h>
58
59 #define local_irq_enable() \
60         do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
61 #define local_irq_disable() \
62         do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
63 #define local_irq_save(flags)                           \
64         do {                                            \
65                 typecheck(unsigned long, flags);        \
66                 raw_local_irq_save(flags);              \
67                 trace_hardirqs_off();                   \
68         } while (0)
69
70
71 #define local_irq_restore(flags)                        \
72         do {                                            \
73                 typecheck(unsigned long, flags);        \
74                 if (raw_irqs_disabled_flags(flags)) {   \
75                         raw_local_irq_restore(flags);   \
76                         trace_hardirqs_off();           \
77                 } else {                                \
78                         trace_hardirqs_on();            \
79                         raw_local_irq_restore(flags);   \
80                 }                                       \
81         } while (0)
82 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
83 /*
84  * The local_irq_*() APIs are equal to the raw_local_irq*()
85  * if !TRACE_IRQFLAGS.
86  */
87 # define raw_local_irq_disable()        local_irq_disable()
88 # define raw_local_irq_enable()         local_irq_enable()
89 # define raw_local_irq_save(flags)                      \
90         do {                                            \
91                 typecheck(unsigned long, flags);        \
92                 local_irq_save(flags);                  \
93         } while (0)
94 # define raw_local_irq_restore(flags)                   \
95         do {                                            \
96                 typecheck(unsigned long, flags);        \
97                 local_irq_restore(flags);               \
98         } while (0)
99 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
100
101 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
102 #define safe_halt()                                             \
103         do {                                                    \
104                 trace_hardirqs_on();                            \
105                 raw_safe_halt();                                \
106         } while (0)
107
108 #define local_save_flags(flags)                         \
109         do {                                            \
110                 typecheck(unsigned long, flags);        \
111                 raw_local_save_flags(flags);            \
112         } while (0)
113
114 #define irqs_disabled()                                         \
115 ({                                                              \
116         unsigned long _flags;                                   \
117                                                                 \
118         raw_local_save_flags(_flags);                           \
119         raw_irqs_disabled_flags(_flags);                        \
120 })
121
122 #define irqs_disabled_flags(flags)              \
123 ({                                              \
124         typecheck(unsigned long, flags);        \
125         raw_irqs_disabled_flags(flags);         \
126 })
127 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
128
129 #endif