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spinlock_types.h
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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 raw_spinlock {
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
33 
34 #define SPINLOCK_MAGIC 0xdead4ead
35 
36 #define SPINLOCK_OWNER_INIT ((void *)-1L)
37 
38 #ifdef CONFIG_DEBUG_LOCK_ALLOC
39 # define SPIN_DEP_MAP_INIT(lockname) .dep_map = { .name = #lockname }
40 #else
41 # define SPIN_DEP_MAP_INIT(lockname)
42 #endif
43 
44 #ifdef CONFIG_DEBUG_SPINLOCK
45 # define SPIN_DEBUG_INIT(lockname) \
46  .magic = SPINLOCK_MAGIC, \
47  .owner_cpu = -1, \
48  .owner = SPINLOCK_OWNER_INIT,
49 #else
50 # define SPIN_DEBUG_INIT(lockname)
51 #endif
52 
53 #define __RAW_SPIN_LOCK_INITIALIZER(lockname) \
54  { \
55  .raw_lock = __ARCH_SPIN_LOCK_UNLOCKED, \
56  SPIN_DEBUG_INIT(lockname) \
57  SPIN_DEP_MAP_INIT(lockname) }
58 
59 #define __RAW_SPIN_LOCK_UNLOCKED(lockname) \
60  (raw_spinlock_t) __RAW_SPIN_LOCK_INITIALIZER(lockname)
61 
62 #define DEFINE_RAW_SPINLOCK(x) raw_spinlock_t x = __RAW_SPIN_LOCK_UNLOCKED(x)
63 
64 typedef struct spinlock {
65  union {
67 
68 #ifdef CONFIG_DEBUG_LOCK_ALLOC
69 # define LOCK_PADSIZE (offsetof(struct raw_spinlock, dep_map))
70  struct {
71  u8 __padding[LOCK_PADSIZE];
72  struct lockdep_map dep_map;
73  };
74 #endif
75  };
76 } spinlock_t;
77 
78 #define __SPIN_LOCK_INITIALIZER(lockname) \
79  { { .rlock = __RAW_SPIN_LOCK_INITIALIZER(lockname) } }
80 
81 #define __SPIN_LOCK_UNLOCKED(lockname) \
82  (spinlock_t ) __SPIN_LOCK_INITIALIZER(lockname)
83 
84 #define DEFINE_SPINLOCK(x) spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
85 
86 #include <linux/rwlock_types.h>
87 
88 #endif /* __LINUX_SPINLOCK_TYPES_H */