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#ifndef __LINUX_SPINLOCK_H
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#ifndef __LINUX_SPINLOCK_H
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# error "please don't include this file directly"
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# error "please don't include this file directly"
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#endif
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#endif
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#include 	/* for cpu_relax() */
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/*
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/*
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 * include/linux/spinlock_up.h - UP-debug version of spinlocks.
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 * include/linux/spinlock_up.h - UP-debug version of spinlocks.
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 *
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 *
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 * move potentially faulting instructions (notably user accesses)
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 * move potentially faulting instructions (notably user accesses)
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 * into the locked sequence, resulting in non-atomic execution.
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 * into the locked sequence, resulting in non-atomic execution.
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 */
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 */
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#ifdef CONFIG_DEBUG_SPINLOCK
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#ifdef CONFIG_DEBUG_SPINLOCK
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#define __raw_spin_is_locked(x)		((x)->slock == 0)
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#define arch_spin_is_locked(x)		((x)->slock == 0)
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static inline void __raw_spin_lock(raw_spinlock_t *lock)
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static inline void arch_spin_lock(arch_spinlock_t *lock)
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{
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{
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	lock->slock = 0;
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	lock->slock = 0;
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	barrier();
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}
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}
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static inline void
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static inline void
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__raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long flags)
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arch_spin_lock_flags(arch_spinlock_t *lock, unsigned long flags)
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{
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{
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	local_irq_save(flags);
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	local_irq_save(flags);
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	lock->slock = 0;
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	lock->slock = 0;
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	barrier();
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}
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}
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static inline int arch_spin_trylock(arch_spinlock_t *lock)
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static inline int __raw_spin_trylock(raw_spinlock_t *lock)
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{
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{
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	char oldval = lock->slock;
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	char oldval = lock->slock;
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	lock->slock = 0;
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	barrier();
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	lock->slock = 0;
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	return oldval > 0;
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	return oldval > 0;
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}
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}
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static inline void arch_spin_unlock(arch_spinlock_t *lock)
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static inline void __raw_spin_unlock(raw_spinlock_t *lock)
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{
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{
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	barrier();
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	lock->slock = 1;
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	lock->slock = 1;
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}
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}
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/*
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/*
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 * Read-write spinlocks. No debug version.
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 * Read-write spinlocks. No debug version.
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 */
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 */
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#define __raw_read_lock(lock)		do { (void)(lock); } while (0)
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#define arch_read_lock(lock)		do { barrier(); (void)(lock); } while (0)
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#define __raw_write_lock(lock)		do { (void)(lock); } while (0)
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#define arch_write_lock(lock)		do { barrier(); (void)(lock); } while (0)
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#define __raw_read_trylock(lock)	({ (void)(lock); 1; })
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#define arch_read_trylock(lock)	({ barrier(); (void)(lock); 1; })
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#define __raw_write_trylock(lock)	({ (void)(lock); 1; })
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#define arch_write_trylock(lock)	({ barrier(); (void)(lock); 1; })
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#define __raw_read_unlock(lock)		do { (void)(lock); } while (0)
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#define arch_read_unlock(lock)		do { barrier(); (void)(lock); } while (0)
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#define __raw_write_unlock(lock)	do { (void)(lock); } while (0)
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#define arch_write_unlock(lock)	do { barrier(); (void)(lock); } while (0)
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#else /* DEBUG_SPINLOCK */
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#else /* DEBUG_SPINLOCK */
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#define __raw_spin_is_locked(lock)	((void)(lock), 0)
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#define arch_spin_is_locked(lock)	((void)(lock), 0)
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/* for sched.c and kernel_lock.c: */
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/* for sched/core.c and kernel_lock.c: */
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# define __raw_spin_lock(lock)		do { (void)(lock); } while (0)
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# define arch_spin_lock(lock)		do { barrier(); (void)(lock); } while (0)
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# define __raw_spin_lock_flags(lock, flags)	do { (void)(lock); } while (0)
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# define arch_spin_lock_flags(lock, flags)	do { barrier(); (void)(lock); } while (0)