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/* $Id: spinlock.h,v 1.3 1998/08/28 15:55:39 ralf Exp $
*/
#ifndef __ASM_MIPS_SPINLOCK_H
#define __ASM_MIPS_SPINLOCK_H
#ifndef __SMP__
/*
* Gcc-2.7.x has a nasty bug with empty initializers.
*/
#if (__GNUC__ > 2) || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8)
typedef struct { } spinlock_t;
#define SPIN_LOCK_UNLOCKED { }
#else
typedef struct { int gcc_is_buggy; } spinlock_t;
#define SPIN_LOCK_UNLOCKED { 0 }
#endif
#define spin_lock_init(lock) do { } while(0)
#define spin_lock(lock) do { } while(0)
#define spin_trylock(lock) (1)
#define spin_unlock_wait(lock) do { } while(0)
#define spin_unlock(lock) do { } while(0)
#define spin_lock_irq(lock) cli()
#define spin_unlock_irq(lock) sti()
#define spin_lock_irqsave(lock, flags) save_and_cli(flags)
#define spin_unlock_irqrestore(lock, flags) restore_flags(flags)
/*
* Read-write spinlocks, allowing multiple readers
* but only one writer.
*
* NOTE! it is quite common to have readers in interrupts
* but no interrupt writers. For those circumstances we
* can "mix" irq-safe locks - any writer needs to get a
* irq-safe write-lock, but readers can get non-irqsafe
* read-locks.
*/
typedef struct { } rwlock_t;
#define RW_LOCK_UNLOCKED { }
#define read_lock(lock) do { } while(0)
#define read_unlock(lock) do { } while(0)
#define write_lock(lock) do { } while(0)
#define write_unlock(lock) do { } while(0)
#define read_lock_irq(lock) cli()
#define read_unlock_irq(lock) sti()
#define write_lock_irq(lock) cli()
#define write_unlock_irq(lock) sti()
#define read_lock_irqsave(lock, flags) save_and_cli(flags)
#define read_unlock_irqrestore(lock, flags) restore_flags(flags)
#define write_lock_irqsave(lock, flags) save_and_cli(flags)
#define write_unlock_irqrestore(lock, flags) restore_flags(flags)
#else
#error "Nix SMP on MIPS"
#endif /* SMP */
#endif /* __ASM_MIPS_SPINLOCK_H */
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