mmc: core: SDXC speed class support
[linux-2.6.git] / include / linux / rwlock.h
1 #ifndef __LINUX_RWLOCK_H
2 #define __LINUX_RWLOCK_H
3
4 #ifndef __LINUX_SPINLOCK_H
5 # error "please don't include this file directly"
6 #endif
7
8 /*
9  * rwlock related methods
10  *
11  * split out from spinlock.h
12  *
13  * portions Copyright 2005, Red Hat, Inc., Ingo Molnar
14  * Released under the General Public License (GPL).
15  */
16
17 #ifdef CONFIG_DEBUG_SPINLOCK
18   extern void __rwlock_init(rwlock_t *lock, const char *name,
19                             struct lock_class_key *key);
20 # define rwlock_init(lock)                                      \
21 do {                                                            \
22         static struct lock_class_key __key;                     \
23                                                                 \
24         __rwlock_init((lock), #lock, &__key);                   \
25 } while (0)
26 #else
27 # define rwlock_init(lock)                                      \
28         do { *(lock) = __RW_LOCK_UNLOCKED(lock); } while (0)
29 #endif
30
31 #ifdef CONFIG_DEBUG_SPINLOCK
32  extern void do_raw_read_lock(rwlock_t *lock) __acquires(lock);
33 #define do_raw_read_lock_flags(lock, flags) do_raw_read_lock(lock)
34  extern int do_raw_read_trylock(rwlock_t *lock);
35  extern void do_raw_read_unlock(rwlock_t *lock) __releases(lock);
36  extern void do_raw_write_lock(rwlock_t *lock) __acquires(lock);
37 #define do_raw_write_lock_flags(lock, flags) do_raw_write_lock(lock)
38  extern int do_raw_write_trylock(rwlock_t *lock);
39  extern void do_raw_write_unlock(rwlock_t *lock) __releases(lock);
40 #else
41 # define do_raw_read_lock(rwlock)       do {__acquire(lock); arch_read_lock(&(rwlock)->raw_lock); } while (0)
42 # define do_raw_read_lock_flags(lock, flags) \
43                 do {__acquire(lock); arch_read_lock_flags(&(lock)->raw_lock, *(flags)); } while (0)
44 # define do_raw_read_trylock(rwlock)    arch_read_trylock(&(rwlock)->raw_lock)
45 # define do_raw_read_unlock(rwlock)     do {arch_read_unlock(&(rwlock)->raw_lock); __release(lock); } while (0)
46 # define do_raw_write_lock(rwlock)      do {__acquire(lock); arch_write_lock(&(rwlock)->raw_lock); } while (0)
47 # define do_raw_write_lock_flags(lock, flags) \
48                 do {__acquire(lock); arch_write_lock_flags(&(lock)->raw_lock, *(flags)); } while (0)
49 # define do_raw_write_trylock(rwlock)   arch_write_trylock(&(rwlock)->raw_lock)
50 # define do_raw_write_unlock(rwlock)    do {arch_write_unlock(&(rwlock)->raw_lock); __release(lock); } while (0)
51 #endif
52
53 #define read_can_lock(rwlock)           arch_read_can_lock(&(rwlock)->raw_lock)
54 #define write_can_lock(rwlock)          arch_write_can_lock(&(rwlock)->raw_lock)
55
56 /*
57  * Define the various rw_lock methods.  Note we define these
58  * regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The various
59  * methods are defined as nops in the case they are not required.
60  */
61 #define read_trylock(lock)      __cond_lock(lock, _raw_read_trylock(lock))
62 #define write_trylock(lock)     __cond_lock(lock, _raw_write_trylock(lock))
63
64 #define write_lock(lock)        _raw_write_lock(lock)
65 #define read_lock(lock)         _raw_read_lock(lock)
66
67 #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
68
69 #define read_lock_irqsave(lock, flags)                  \
70         do {                                            \
71                 typecheck(unsigned long, flags);        \
72                 flags = _raw_read_lock_irqsave(lock);   \
73         } while (0)
74 #define write_lock_irqsave(lock, flags)                 \
75         do {                                            \
76                 typecheck(unsigned long, flags);        \
77                 flags = _raw_write_lock_irqsave(lock);  \
78         } while (0)
79
80 #else
81
82 #define read_lock_irqsave(lock, flags)                  \
83         do {                                            \
84                 typecheck(unsigned long, flags);        \
85                 _raw_read_lock_irqsave(lock, flags);    \
86         } while (0)
87 #define write_lock_irqsave(lock, flags)                 \
88         do {                                            \
89                 typecheck(unsigned long, flags);        \
90                 _raw_write_lock_irqsave(lock, flags);   \
91         } while (0)
92
93 #endif
94
95 #define read_lock_irq(lock)             _raw_read_lock_irq(lock)
96 #define read_lock_bh(lock)              _raw_read_lock_bh(lock)
97 #define write_lock_irq(lock)            _raw_write_lock_irq(lock)
98 #define write_lock_bh(lock)             _raw_write_lock_bh(lock)
99 #define read_unlock(lock)               _raw_read_unlock(lock)
100 #define write_unlock(lock)              _raw_write_unlock(lock)
101 #define read_unlock_irq(lock)           _raw_read_unlock_irq(lock)
102 #define write_unlock_irq(lock)          _raw_write_unlock_irq(lock)
103
104 #define read_unlock_irqrestore(lock, flags)                     \
105         do {                                                    \
106                 typecheck(unsigned long, flags);                \
107                 _raw_read_unlock_irqrestore(lock, flags);       \
108         } while (0)
109 #define read_unlock_bh(lock)            _raw_read_unlock_bh(lock)
110
111 #define write_unlock_irqrestore(lock, flags)            \
112         do {                                            \
113                 typecheck(unsigned long, flags);        \
114                 _raw_write_unlock_irqrestore(lock, flags);      \
115         } while (0)
116 #define write_unlock_bh(lock)           _raw_write_unlock_bh(lock)
117
118 #define write_trylock_irqsave(lock, flags) \
119 ({ \
120         local_irq_save(flags); \
121         write_trylock(lock) ? \
122         1 : ({ local_irq_restore(flags); 0; }); \
123 })
124
125 #endif /* __LINUX_RWLOCK_H */