| 1 | #ifndef __LINUX_RWLOCK_H
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| 2 | #define __LINUX_RWLOCK_H
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| 3 |
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| 4 | #ifndef __LINUX_INSIDE_SPINLOCK_H
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| 5 | # error "Please do not include this file directly."
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| 6 | #endif
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| 7 |
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| 8 | |
| 9 | * rwlock related methods
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| 10 | *
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| 11 | * split out from spinlock.h
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| 12 | *
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| 13 | * portions Copyright 2005, Red Hat, Inc., Ingo Molnar
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| 14 | * Released under the General Public License (GPL).
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| 15 |
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| 16 |
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| 17 | #ifdef CONFIG_DEBUG_SPINLOCK
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| 18 | extern void __rwlock_init(rwlock_t *lock, const char *name,
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| 19 | struct lock_class_key *key);
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| 20 | # define rwlock_init(lock) \
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| 21 | do { \
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| 22 | static struct lock_class_key __key; \
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| 23 | \
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| 24 | __rwlock_init((lock), #lock, &__key); \
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| 25 | } while (0)
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| 26 | #else
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| 27 | # define rwlock_init(lock) \
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| 28 | do { *(lock) = __RW_LOCK_UNLOCKED(lock); } while (0)
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| 29 | #endif
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| 30 |
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| 31 | #ifdef CONFIG_DEBUG_SPINLOCK
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| 32 | extern void do_raw_read_lock(rwlock_t *lock) __acquires_shared(lock);
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| 33 | extern int do_raw_read_trylock(rwlock_t *lock) __cond_acquires_shared(true, lock);
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| 34 | extern void do_raw_read_unlock(rwlock_t *lock) __releases_shared(lock);
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| 35 | extern void do_raw_write_lock(rwlock_t *lock) __acquires(lock);
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| 36 | extern int do_raw_write_trylock(rwlock_t *lock) __cond_acquires(true, lock);
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| 37 | extern void do_raw_write_unlock(rwlock_t *lock) __releases(lock);
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| 38 | #else
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| 39 | # define do_raw_read_lock(rwlock) do {__acquire_shared(lock); arch_read_lock(&(rwlock)->raw_lock); } while (0)
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| 40 | static inline int do_raw_read_trylock(rwlock_t *rwlock)
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| 41 | __cond_acquires_shared(true, rwlock)
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| 42 | __no_context_analysis
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| 43 | {
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| 44 | return arch_read_trylock(&(rwlock)->raw_lock);
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| 45 | }
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| 46 | # define do_raw_read_unlock(rwlock) do {arch_read_unlock(&(rwlock)->raw_lock); __release_shared(lock); } while (0)
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| 47 | # define do_raw_write_lock(rwlock) do {__acquire(lock); arch_write_lock(&(rwlock)->raw_lock); } while (0)
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| 48 | static inline int do_raw_write_trylock(rwlock_t *rwlock)
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| 49 | __cond_acquires(true, rwlock)
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| 50 | __no_context_analysis
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| 51 | {
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| 52 | return arch_write_trylock(&(rwlock)->raw_lock);
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| 53 | }
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| 54 | # define do_raw_write_unlock(rwlock) do {arch_write_unlock(&(rwlock)->raw_lock); __release(lock); } while (0)
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| 55 | #endif
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| 56 |
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| 57 | |
| 58 | * Define the various rw_lock methods. Note we define these
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| 59 | * regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The various
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| 60 | * methods are defined as nops in the case they are not required.
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| 61 |
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| 62 | #define read_trylock(lock) _raw_read_trylock(lock)
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| 63 | #define write_trylock(lock) _raw_write_trylock(lock)
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| 64 |
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| 65 | #define write_lock(lock) _raw_write_lock(lock)
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| 66 | #define read_lock(lock) _raw_read_lock(lock)
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| 67 |
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| 68 | #ifdef CONFIG_DEBUG_LOCK_ALLOC
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| 69 | #define write_lock_nested(lock, subclass) _raw_write_lock_nested(lock, subclass)
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| 70 | #else
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| 71 | #define write_lock_nested(lock, subclass) _raw_write_lock(lock)
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| 72 | #endif
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| 73 |
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| 74 | #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
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| 75 |
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| 76 | #define read_lock_irqsave(lock, flags) \
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| 77 | do { \
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| 78 | typecheck(unsigned long, flags); \
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| 79 | flags = _raw_read_lock_irqsave(lock); \
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| 80 | } while (0)
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| 81 | #define write_lock_irqsave(lock, flags) \
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| 82 | do { \
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| 83 | typecheck(unsigned long, flags); \
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| 84 | flags = _raw_write_lock_irqsave(lock); \
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| 85 | } while (0)
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| 86 |
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| 87 | #else
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| 88 |
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| 89 | #define read_lock_irqsave(lock, flags) \
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| 90 | do { \
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| 91 | typecheck(unsigned long, flags); \
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| 92 | _raw_read_lock_irqsave(lock, flags); \
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| 93 | } while (0)
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| 94 | #define write_lock_irqsave(lock, flags) \
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| 95 | do { \
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| 96 | typecheck(unsigned long, flags); \
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| 97 | _raw_write_lock_irqsave(lock, flags); \
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| 98 | } while (0)
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| 99 |
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| 100 | #endif
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| 101 |
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| 102 | #define read_lock_irq(lock) _raw_read_lock_irq(lock)
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| 103 | #define read_lock_bh(lock) _raw_read_lock_bh(lock)
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| 104 | #define write_lock_irq(lock) _raw_write_lock_irq(lock)
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| 105 | #define write_lock_bh(lock) _raw_write_lock_bh(lock)
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| 106 | #define read_unlock(lock) _raw_read_unlock(lock)
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| 107 | #define write_unlock(lock) _raw_write_unlock(lock)
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| 108 | #define read_unlock_irq(lock) _raw_read_unlock_irq(lock)
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| 109 | #define write_unlock_irq(lock) _raw_write_unlock_irq(lock)
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| 110 |
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| 111 | #define read_unlock_irqrestore(lock, flags) \
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| 112 | do { \
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| 113 | typecheck(unsigned long, flags); \
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| 114 | _raw_read_unlock_irqrestore(lock, flags); \
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| 115 | } while (0)
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| 116 | #define read_unlock_bh(lock) _raw_read_unlock_bh(lock)
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| 117 |
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| 118 | #define write_unlock_irqrestore(lock, flags) \
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| 119 | do { \
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| 120 | typecheck(unsigned long, flags); \
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| 121 | _raw_write_unlock_irqrestore(lock, flags); \
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| 122 | } while (0)
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| 123 | #define write_unlock_bh(lock) _raw_write_unlock_bh(lock)
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| 124 |
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| 125 | #define write_trylock_irqsave(lock, flags) _raw_write_trylock_irqsave(lock, &(flags))
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| 126 |
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| 127 | #ifdef arch_rwlock_is_contended
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| 128 | #define rwlock_is_contended(lock) \
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| 129 | arch_rwlock_is_contended(&(lock)->raw_lock)
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| 130 | #else
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| 131 | #define rwlock_is_contended(lock) ((void)(lock), 0)
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| 132 | #endif
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| 133 |
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| 134 | #endif
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