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Viewing changes to arch/powerpc/include/asm/rwsem.h

  • Committer: Bazaar Package Importer
  • Author(s): Paolo Pisati
  • Date: 2011-06-29 15:23:51 UTC
  • mfrom: (26.1.1 natty-proposed)
  • Revision ID: james.westby@ubuntu.com-20110629152351-xs96tm303d95rpbk
Tags: 3.0.0-1200.2
* Rebased against 3.0.0-6.7
* BSP from TI based on 3.0.0

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arch/powerpc/include/asm/rwsem.h
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 * by Paul Mackerras <paulus@samba.org>.
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 */
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#include <linux/list.h>
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#include <linux/spinlock.h>
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#include <asm/atomic.h>
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#include <asm/system.h>
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/*
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 * the semaphore definition
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 */
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#define RWSEM_ACTIVE_READ_BIAS          RWSEM_ACTIVE_BIAS
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#define RWSEM_ACTIVE_WRITE_BIAS         (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS)
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struct rw_semaphore {
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        long                    count;
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        spinlock_t              wait_lock;
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        struct list_head        wait_list;
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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        struct lockdep_map      dep_map;
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#endif
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};
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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# define __RWSEM_DEP_MAP_INIT(lockname) , .dep_map = { .name = #lockname }
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#else
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# define __RWSEM_DEP_MAP_INIT(lockname)
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#endif
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#define __RWSEM_INITIALIZER(name)                               \
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{                                                               \
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        RWSEM_UNLOCKED_VALUE,                                   \
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        __SPIN_LOCK_UNLOCKED((name).wait_lock),                 \
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        LIST_HEAD_INIT((name).wait_list)                        \
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        __RWSEM_DEP_MAP_INIT(name)                              \
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}
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#define DECLARE_RWSEM(name)             \
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        struct rw_semaphore name = __RWSEM_INITIALIZER(name)
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extern struct rw_semaphore *rwsem_down_read_failed(struct rw_semaphore *sem);
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extern struct rw_semaphore *rwsem_down_write_failed(struct rw_semaphore *sem);
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extern struct rw_semaphore *rwsem_wake(struct rw_semaphore *sem);
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extern struct rw_semaphore *rwsem_downgrade_wake(struct rw_semaphore *sem);
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extern void __init_rwsem(struct rw_semaphore *sem, const char *name,
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                         struct lock_class_key *key);
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#define init_rwsem(sem)                                 \
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        do {                                            \
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                static struct lock_class_key __key;     \
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                                                        \
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                __init_rwsem((sem), #sem, &__key);      \
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        } while (0)
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/*
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 * lock for reading
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 */
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        return atomic_long_add_return(delta, (atomic_long_t *)&sem->count);
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}
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static inline int rwsem_is_locked(struct rw_semaphore *sem)
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{
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        return sem->count != 0;
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}
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#endif  /* __KERNEL__ */
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#endif  /* _ASM_POWERPC_RWSEM_H */