1#ifndef __LINUX_RWLOCK_TYPES_H
2#define __LINUX_RWLOCK_TYPES_H
3
4#if !defined(__LINUX_SPINLOCK_TYPES_H)
5# error "Do not include directly, include spinlock_types.h"
6#endif
7
8#ifdef CONFIG_DEBUG_LOCK_ALLOC
9# define RW_DEP_MAP_INIT(lockname)					\
10	.dep_map = {							\
11		.name = #lockname,					\
12		.wait_type_inner = LD_WAIT_CONFIG,			\
13	}
14#else
15# define RW_DEP_MAP_INIT(lockname)
16#endif
17
18#ifndef CONFIG_PREEMPT_RT
19/*
20 * generic rwlock type definitions and initializers
21 *
22 * portions Copyright 2005, Red Hat, Inc., Ingo Molnar
23 * Released under the General Public License (GPL).
24 */
25typedef struct {
26	arch_rwlock_t raw_lock;
27#ifdef CONFIG_DEBUG_SPINLOCK
28	unsigned int magic, owner_cpu;
29	void *owner;
30#endif
31#ifdef CONFIG_DEBUG_LOCK_ALLOC
32	struct lockdep_map dep_map;
33#endif
34} rwlock_t;
35
36#define RWLOCK_MAGIC		0xdeaf1eed
37
38#ifdef CONFIG_DEBUG_SPINLOCK
39#define __RW_LOCK_UNLOCKED(lockname)					\
40	(rwlock_t)	{	.raw_lock = __ARCH_RW_LOCK_UNLOCKED,	\
41				.magic = RWLOCK_MAGIC,			\
42				.owner = SPINLOCK_OWNER_INIT,		\
43				.owner_cpu = -1,			\
44				RW_DEP_MAP_INIT(lockname) }
45#else
46#define __RW_LOCK_UNLOCKED(lockname) \
47	(rwlock_t)	{	.raw_lock = __ARCH_RW_LOCK_UNLOCKED,	\
48				RW_DEP_MAP_INIT(lockname) }
49#endif
50
51#define DEFINE_RWLOCK(x)	rwlock_t x = __RW_LOCK_UNLOCKED(x)
52
53#else /* !CONFIG_PREEMPT_RT */
54
55#include <linux/rwbase_rt.h>
56
57typedef struct {
58	struct rwbase_rt	rwbase;
59	atomic_t		readers;
60#ifdef CONFIG_DEBUG_LOCK_ALLOC
61	struct lockdep_map	dep_map;
62#endif
63} rwlock_t;
64
65#define __RWLOCK_RT_INITIALIZER(name)					\
66{									\
67	.rwbase = __RWBASE_INITIALIZER(name),				\
68	RW_DEP_MAP_INIT(name)						\
69}
70
71#define __RW_LOCK_UNLOCKED(name) __RWLOCK_RT_INITIALIZER(name)
72
73#define DEFINE_RWLOCK(name)						\
74	rwlock_t name = __RW_LOCK_UNLOCKED(name)
75
76#endif /* CONFIG_PREEMPT_RT */
77
78#endif /* __LINUX_RWLOCK_TYPES_H */
79