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 #include <linux/spinlock_types_raw.h>
13 
14 #ifndef CONFIG_PREEMPT_RT
15 
16 /* Non PREEMPT_RT kernels map spinlock to raw_spinlock */
17 typedef struct spinlock {
18 	union {
19 		struct raw_spinlock rlock;
20 
21 #ifdef CONFIG_DEBUG_LOCK_ALLOC
22 # define LOCK_PADSIZE (offsetof(struct raw_spinlock, dep_map))
23 		struct {
24 			u8 __padding[LOCK_PADSIZE];
25 			struct lockdep_map dep_map;
26 		};
27 #endif
28 	};
29 } spinlock_t;
30 
31 #define ___SPIN_LOCK_INITIALIZER(lockname)	\
32 	{					\
33 	.raw_lock = __ARCH_SPIN_LOCK_UNLOCKED,	\
34 	SPIN_DEBUG_INIT(lockname)		\
35 	SPIN_DEP_MAP_INIT(lockname) }
36 
37 #define __SPIN_LOCK_INITIALIZER(lockname) \
38 	{ { .rlock = ___SPIN_LOCK_INITIALIZER(lockname) } }
39 
40 #define __SPIN_LOCK_UNLOCKED(lockname) \
41 	(spinlock_t) __SPIN_LOCK_INITIALIZER(lockname)
42 
43 #define DEFINE_SPINLOCK(x)	spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
44 
45 #else /* !CONFIG_PREEMPT_RT */
46 
47 /* PREEMPT_RT kernels map spinlock to rt_mutex */
48 #include <linux/rtmutex.h>
49 
50 typedef struct spinlock {
51 	struct rt_mutex_base	lock;
52 #ifdef CONFIG_DEBUG_LOCK_ALLOC
53 	struct lockdep_map	dep_map;
54 #endif
55 } spinlock_t;
56 
57 #define __SPIN_LOCK_UNLOCKED(name)				\
58 	{							\
59 		.lock = __RT_MUTEX_BASE_INITIALIZER(name.lock),	\
60 		SPIN_DEP_MAP_INIT(name)				\
61 	}
62 
63 #define __LOCAL_SPIN_LOCK_UNLOCKED(name)			\
64 	{							\
65 		.lock = __RT_MUTEX_BASE_INITIALIZER(name.lock),	\
66 		LOCAL_SPIN_DEP_MAP_INIT(name)			\
67 	}
68 
69 #define DEFINE_SPINLOCK(name)					\
70 	spinlock_t name = __SPIN_LOCK_UNLOCKED(name)
71 
72 #endif /* CONFIG_PREEMPT_RT */
73 
74 #include <linux/rwlock_types.h>
75 
76 #endif /* __LINUX_SPINLOCK_TYPES_H */
77