Merge branch 'cfq-2.6.33' into for-2.6.33
[linux-2.6/next.git] / include / linux / irqflags.h
blobb02a3f1d46a0595788b86220bcbee174171ad78c
1 /*
2 * include/linux/irqflags.h
4 * IRQ flags tracing: follow the state of the hardirq and softirq flags and
5 * provide callbacks for transitions between ON and OFF states.
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.
11 #ifndef _LINUX_TRACE_IRQFLAGS_H
12 #define _LINUX_TRACE_IRQFLAGS_H
14 #include <linux/typecheck.h>
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
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
55 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
57 #include <asm/irqflags.h>
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)
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 */
84 * The local_irq_*() APIs are equal to the raw_local_irq*()
85 * if !TRACE_IRQFLAGS.
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 */
101 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
102 #define safe_halt() \
103 do { \
104 trace_hardirqs_on(); \
105 raw_safe_halt(); \
106 } while (0)
108 #define local_save_flags(flags) \
109 do { \
110 typecheck(unsigned long, flags); \
111 raw_local_save_flags(flags); \
112 } while (0)
114 #define irqs_disabled() \
115 ({ \
116 unsigned long _flags; \
118 raw_local_save_flags(_flags); \
119 raw_irqs_disabled_flags(_flags); \
122 #define irqs_disabled_flags(flags) \
123 ({ \
124 typecheck(unsigned long, flags); \
125 raw_irqs_disabled_flags(flags); \
127 #endif /* CONFIG_X86 */
129 #endif