Viewing file:  spinlock.h (2.47 KB) -rw-r--r--
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/*
* Copyright 2004-2009 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#ifndef __BFIN_SPINLOCK_H
#define __BFIN_SPINLOCK_H
#ifndef CONFIG_SMP
# include <asm-generic/spinlock.h>
#else
#include <linux/atomic.h>
asmlinkage int __raw_spin_is_locked_asm(volatile int *ptr);
asmlinkage void __raw_spin_lock_asm(volatile int *ptr);
asmlinkage int __raw_spin_trylock_asm(volatile int *ptr);
asmlinkage void __raw_spin_unlock_asm(volatile int *ptr);
asmlinkage void __raw_read_lock_asm(volatile int *ptr);
asmlinkage int __raw_read_trylock_asm(volatile int *ptr);
asmlinkage void __raw_read_unlock_asm(volatile int *ptr);
asmlinkage void __raw_write_lock_asm(volatile int *ptr);
asmlinkage int __raw_write_trylock_asm(volatile int *ptr);
asmlinkage void __raw_write_unlock_asm(volatile int *ptr);
static inline int arch_spin_is_locked(arch_spinlock_t *lock)
{
return __raw_spin_is_locked_asm(&lock->lock);
}
static inline void arch_spin_lock(arch_spinlock_t *lock)
{
__raw_spin_lock_asm(&lock->lock);
}
#define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock)
static inline int arch_spin_trylock(arch_spinlock_t *lock)
{
return __raw_spin_trylock_asm(&lock->lock);
}
static inline void arch_spin_unlock(arch_spinlock_t *lock)
{
__raw_spin_unlock_asm(&lock->lock);
}
static inline void arch_spin_unlock_wait(arch_spinlock_t *lock)
{
while (arch_spin_is_locked(lock))
cpu_relax();
}
static inline int arch_read_can_lock(arch_rwlock_t *rw)
{
return __raw_uncached_fetch_asm(&rw->lock) > 0;
}
static inline int arch_write_can_lock(arch_rwlock_t *rw)
{
return __raw_uncached_fetch_asm(&rw->lock) == RW_LOCK_BIAS;
}
static inline void arch_read_lock(arch_rwlock_t *rw)
{
__raw_read_lock_asm(&rw->lock);
}
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
static inline int arch_read_trylock(arch_rwlock_t *rw)
{
return __raw_read_trylock_asm(&rw->lock);
}
static inline void arch_read_unlock(arch_rwlock_t *rw)
{
__raw_read_unlock_asm(&rw->lock);
}
static inline void arch_write_lock(arch_rwlock_t *rw)
{
__raw_write_lock_asm(&rw->lock);
}
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
static inline int arch_write_trylock(arch_rwlock_t *rw)
{
return __raw_write_trylock_asm(&rw->lock);
}
static inline void arch_write_unlock(arch_rwlock_t *rw)
{
__raw_write_unlock_asm(&rw->lock);
}
#define arch_spin_relax(lock) cpu_relax()
#define arch_read_relax(lock) cpu_relax()
#define arch_write_relax(lock) cpu_relax()
#endif
#endif /* !__BFIN_SPINLOCK_H */
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