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2 * atomic32.c: 32-bit atomic_t implementation
4 * Copyright (C) 2004 Keith M Wesolowski
6 * Based on asm-parisc/atomic.h Copyright (C) 2000 Philipp Rumpf
9 #include <asm/atomic.h>
10 #include <linux/spinlock.h>
11 #include <linux/module.h>
14 #define ATOMIC_HASH_SIZE 4
15 #define ATOMIC_HASH(a) (&__atomic_hash[(((unsigned long)a)>>8) & (ATOMIC_HASH_SIZE-1)])
17 spinlock_t __atomic_hash
[ATOMIC_HASH_SIZE
] = {
18 [0 ... (ATOMIC_HASH_SIZE
-1)] = SPIN_LOCK_UNLOCKED
23 static DEFINE_SPINLOCK(dummy
);
24 #define ATOMIC_HASH_SIZE 1
25 #define ATOMIC_HASH(a) (&dummy)
29 int __atomic_add_return(int i
, atomic_t
*v
)
33 spin_lock_irqsave(ATOMIC_HASH(v
), flags
);
35 ret
= (v
->counter
+= i
);
37 spin_unlock_irqrestore(ATOMIC_HASH(v
), flags
);
40 EXPORT_SYMBOL(__atomic_add_return
);
42 int atomic_cmpxchg(atomic_t
*v
, int old
, int new)
47 spin_lock_irqsave(ATOMIC_HASH(v
), flags
);
49 if (likely(ret
== old
))
52 spin_unlock_irqrestore(ATOMIC_HASH(v
), flags
);
56 void atomic_set(atomic_t
*v
, int i
)
60 spin_lock_irqsave(ATOMIC_HASH(v
), flags
);
62 spin_unlock_irqrestore(ATOMIC_HASH(v
), flags
);
64 EXPORT_SYMBOL(atomic_set
);