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- #ifndef __M68K_SPINLOCK_H
- #define __M68K_SPINLOCK_H
-
- /*
- * We don't do SMP on the m68k .... at least not yet.
- */
-
- /*
- * 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 (spinlock_t) { }
- #else
- typedef struct { int gcc_is_buggy; } spinlock_t;
- #define SPIN_LOCK_UNLOCKED (spinlock_t) { 0 }
- #endif
-
- #define spin_lock_init(lock) do { } while(0)
- #define spin_lock(lock) do { } while(0)
- #define spin_trylock(lock) do { } while(0)
- #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) \
- do { save_flags(flags); cli(); } while (0)
- #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.
- *
- * Gcc-2.7.x has a nasty bug with empty initializers.
- */
- #if (__GNUC__ > 2) || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8)
- typedef struct { } rwlock_t;
- #define RW_LOCK_UNLOCKED (rwlock_t) { }
- #else
- typedef struct { int gcc_is_buggy; } rwlock_t;
- #define RW_LOCK_UNLOCKED (rwlock_t) { 0 }
- #endif
-
- #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)
-
- #endif
-