forked from Minki/linux
60063497a9
This allows us to move duplicated code in <asm/atomic.h> (atomic_inc_not_zero() for now) to <linux/atomic.h> Signed-off-by: Arun Sharma <asharma@fb.com> Reviewed-by: Eric Dumazet <eric.dumazet@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: David Miller <davem@davemloft.net> Cc: Eric Dumazet <eric.dumazet@gmail.com> Acked-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
106 lines
2.5 KiB
C
106 lines
2.5 KiB
C
/*
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* Copyright 2004-2009 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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#ifndef __BFIN_SPINLOCK_H
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#define __BFIN_SPINLOCK_H
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#ifndef CONFIG_SMP
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# include <asm-generic/spinlock.h>
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#else
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#include <linux/atomic.h>
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asmlinkage int __raw_spin_is_locked_asm(volatile int *ptr);
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asmlinkage void __raw_spin_lock_asm(volatile int *ptr);
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asmlinkage int __raw_spin_trylock_asm(volatile int *ptr);
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asmlinkage void __raw_spin_unlock_asm(volatile int *ptr);
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asmlinkage void __raw_read_lock_asm(volatile int *ptr);
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asmlinkage int __raw_read_trylock_asm(volatile int *ptr);
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asmlinkage void __raw_read_unlock_asm(volatile int *ptr);
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asmlinkage void __raw_write_lock_asm(volatile int *ptr);
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asmlinkage int __raw_write_trylock_asm(volatile int *ptr);
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asmlinkage void __raw_write_unlock_asm(volatile int *ptr);
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static inline int arch_spin_is_locked(arch_spinlock_t *lock)
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{
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return __raw_spin_is_locked_asm(&lock->lock);
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}
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static inline void arch_spin_lock(arch_spinlock_t *lock)
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{
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__raw_spin_lock_asm(&lock->lock);
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}
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#define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock)
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static inline int arch_spin_trylock(arch_spinlock_t *lock)
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{
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return __raw_spin_trylock_asm(&lock->lock);
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}
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static inline void arch_spin_unlock(arch_spinlock_t *lock)
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{
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__raw_spin_unlock_asm(&lock->lock);
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}
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static inline void arch_spin_unlock_wait(arch_spinlock_t *lock)
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{
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while (arch_spin_is_locked(lock))
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cpu_relax();
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}
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static inline int arch_read_can_lock(arch_rwlock_t *rw)
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{
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return __raw_uncached_fetch_asm(&rw->lock) > 0;
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}
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static inline int arch_write_can_lock(arch_rwlock_t *rw)
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{
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return __raw_uncached_fetch_asm(&rw->lock) == RW_LOCK_BIAS;
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}
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static inline void arch_read_lock(arch_rwlock_t *rw)
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{
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__raw_read_lock_asm(&rw->lock);
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}
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#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
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static inline int arch_read_trylock(arch_rwlock_t *rw)
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{
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return __raw_read_trylock_asm(&rw->lock);
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}
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static inline void arch_read_unlock(arch_rwlock_t *rw)
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{
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__raw_read_unlock_asm(&rw->lock);
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}
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static inline void arch_write_lock(arch_rwlock_t *rw)
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{
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__raw_write_lock_asm(&rw->lock);
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}
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#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
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static inline int arch_write_trylock(arch_rwlock_t *rw)
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{
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return __raw_write_trylock_asm(&rw->lock);
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}
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static inline void arch_write_unlock(arch_rwlock_t *rw)
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{
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__raw_write_unlock_asm(&rw->lock);
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}
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#define arch_spin_relax(lock) cpu_relax()
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#define arch_read_relax(lock) cpu_relax()
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#define arch_write_relax(lock) cpu_relax()
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#endif
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#endif /* !__BFIN_SPINLOCK_H */
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