1 #ifndef __LINUX_SPINLOCK_TYPES_H
2 #define __LINUX_SPINLOCK_TYPES_H
3
4 /*
5 * include/linux/spinlock_types.h - generic spinlock type definitions
6 * and initializers
7 *
8 * portions Copyright 2005, Red Hat, Inc., Ingo Molnar
9 * Released under the General Public License (GPL).
10 */
11
12 #if defined(CONFIG_SMP)
13 # include <asm/spinlock_types.h>
14 #else
15 # include <linux/spinlock_types_up.h>
16 #endif
17
18 #include <linux/lockdep.h>
19
20 typedef struct {
21 raw_spinlock_t raw_lock;
22 #ifdef CONFIG_GENERIC_LOCKBREAK
23 unsigned int break_lock;
24 #endif
25 #ifdef CONFIG_DEBUG_SPINLOCK
26 unsigned int magic, owner_cpu;
27 void *owner;
28 #endif
29 #ifdef CONFIG_DEBUG_LOCK_ALLOC
30 struct lockdep_map dep_map;
31 #endif
32 } spinlock_t;
33
34 #define SPINLOCK_MAGIC 0xdead4ead
35
36 typedef struct {
37 raw_rwlock_t raw_lock;
38 #ifdef CONFIG_GENERIC_LOCKBREAK
39 unsigned int break_lock;
40 #endif
41 #ifdef CONFIG_DEBUG_SPINLOCK
42 unsigned int magic, owner_cpu;
43 void *owner;
44 #endif
45 #ifdef CONFIG_DEBUG_LOCK_ALLOC
46 struct lockdep_map dep_map;
47 #endif
48 } rwlock_t;
49
50 #define RWLOCK_MAGIC 0xdeaf1eed
51
52 #define SPINLOCK_OWNER_INIT ((void *)-1L)
53
54 #ifdef CONFIG_DEBUG_LOCK_ALLOC
55 # define SPIN_DEP_MAP_INIT(lockname) .dep_map = { .name = #lockname }
56 #else
57 # define SPIN_DEP_MAP_INIT(lockname)
58 #endif
59
60 #ifdef CONFIG_DEBUG_LOCK_ALLOC
61 # define RW_DEP_MAP_INIT(lockname) .dep_map = { .name = #lockname }
62 #else
63 # define RW_DEP_MAP_INIT(lockname)
64 #endif
65
66 #ifdef CONFIG_DEBUG_SPINLOCK
67 # define __SPIN_LOCK_UNLOCKED(lockname) \
68 (spinlock_t) { .raw_lock = __RAW_SPIN_LOCK_UNLOCKED, \
69 .magic = SPINLOCK_MAGIC, \
70 .owner = SPINLOCK_OWNER_INIT, \
71 .owner_cpu = -1, \
72 SPIN_DEP_MAP_INIT(lockname) }
73 #define __RW_LOCK_UNLOCKED(lockname) \
74 (rwlock_t) { .raw_lock = __RAW_RW_LOCK_UNLOCKED, \
75 .magic = RWLOCK_MAGIC, \
76 .owner = SPINLOCK_OWNER_INIT, \
77 .owner_cpu = -1, \
78 RW_DEP_MAP_INIT(lockname) }
79 #else
80 # define __SPIN_LOCK_UNLOCKED(lockname) \
81 (spinlock_t) { .raw_lock = __RAW_SPIN_LOCK_UNLOCKED, \
82 SPIN_DEP_MAP_INIT(lockname) }
83 #define __RW_LOCK_UNLOCKED(lockname) \
84 (rwlock_t) { .raw_lock = __RAW_RW_LOCK_UNLOCKED, \
85 RW_DEP_MAP_INIT(lockname) }
86 #endif
87
88 /*
89 * SPIN_LOCK_UNLOCKED and RW_LOCK_UNLOCKED defeat lockdep state tracking and
90 * are hence deprecated.
91 * Please use DEFINE_SPINLOCK()/DEFINE_RWLOCK() or
92 * __SPIN_LOCK_UNLOCKED()/__RW_LOCK_UNLOCKED() as appropriate.
93 */
94 #define SPIN_LOCK_UNLOCKED __SPIN_LOCK_UNLOCKED(old_style_spin_init)
95 #define RW_LOCK_UNLOCKED __RW_LOCK_UNLOCKED(old_style_rw_init)
96
97 #define DEFINE_SPINLOCK(x) spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
98 #define DEFINE_RWLOCK(x) rwlock_t x = __RW_LOCK_UNLOCKED(x)
99
100 #endif /* __LINUX_SPINLOCK_TYPES_H */
101
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