1 #ifndef __LINUX_RWLOCK_TYPES_H
2 #define __LINUX_RWLOCK_TYPES_H
5 * include/linux/rwlock_types.h - generic rwlock type definitions
8 * portions Copyright 2005, Red Hat, Inc., Ingo Molnar
9 * Released under the General Public License (GPL).
12 arch_rwlock_t raw_lock
;
13 #ifdef CONFIG_GENERIC_LOCKBREAK
14 unsigned int break_lock
;
16 #ifdef CONFIG_DEBUG_SPINLOCK
17 unsigned int magic
, owner_cpu
;
20 #ifdef CONFIG_DEBUG_LOCK_ALLOC
21 struct lockdep_map dep_map
;
25 #define RWLOCK_MAGIC 0xdeaf1eed
27 #ifdef CONFIG_DEBUG_LOCK_ALLOC
28 # define RW_DEP_MAP_INIT(lockname) .dep_map = { .name = #lockname }
30 # define RW_DEP_MAP_INIT(lockname)
33 #ifdef CONFIG_DEBUG_SPINLOCK
34 #define __RW_LOCK_UNLOCKED(lockname) \
35 (rwlock_t) { .raw_lock = __ARCH_RW_LOCK_UNLOCKED, \
36 .magic = RWLOCK_MAGIC, \
37 .owner = SPINLOCK_OWNER_INIT, \
39 RW_DEP_MAP_INIT(lockname) }
41 #define __RW_LOCK_UNLOCKED(lockname) \
42 (rwlock_t) { .raw_lock = __ARCH_RW_LOCK_UNLOCKED, \
43 RW_DEP_MAP_INIT(lockname) }
47 * RW_LOCK_UNLOCKED defeat lockdep state tracking and is hence
50 * Please use DEFINE_RWLOCK() or __RW_LOCK_UNLOCKED() as appropriate.
52 #define RW_LOCK_UNLOCKED __RW_LOCK_UNLOCKED(old_style_rw_init)
54 #define DEFINE_RWLOCK(x) rwlock_t x = __RW_LOCK_UNLOCKED(x)
56 #endif /* __LINUX_RWLOCK_TYPES_H */
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