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 {
21 	arch_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 } raw_spinlock_t;
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 {
66 		struct raw_spinlock rlock;
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 */
89