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Initial revision
[linux-2.6.git]
/
arch
/
sparc
/
lib
/
atomic32.c
diff --git
a/arch/sparc/lib/atomic32.c
b/arch/sparc/lib/atomic32.c
index
e28a6af
..
de84f85
100644
(file)
--- a/
arch/sparc/lib/atomic32.c
+++ b/
arch/sparc/lib/atomic32.c
@@
-20,8
+20,9
@@
spinlock_t __atomic_hash[ATOMIC_HASH_SIZE] = {
#else /* SMP */
#else /* SMP */
+static DEFINE_SPINLOCK(dummy);
#define ATOMIC_HASH_SIZE 1
#define ATOMIC_HASH_SIZE 1
-#define ATOMIC_HASH(a)
0
+#define ATOMIC_HASH(a)
(&dummy)
#endif /* SMP */
#endif /* SMP */
@@
-36,17
+37,42
@@
int __atomic_add_return(int i, atomic_t *v)
spin_unlock_irqrestore(ATOMIC_HASH(v), flags);
return ret;
}
spin_unlock_irqrestore(ATOMIC_HASH(v), flags);
return ret;
}
+EXPORT_SYMBOL(__atomic_add_return);
-
void atomic_set(atomic_t *v, int i
)
+
int atomic_cmpxchg(atomic_t *v, int old, int new
)
{
{
+ int ret;
unsigned long flags;
unsigned long flags;
+
spin_lock_irqsave(ATOMIC_HASH(v), flags);
spin_lock_irqsave(ATOMIC_HASH(v), flags);
+ ret = v->counter;
+ if (likely(ret == old))
+ v->counter = new;
- v->counter = i;
+ spin_unlock_irqrestore(ATOMIC_HASH(v), flags);
+ return ret;
+}
+
+int atomic_add_unless(atomic_t *v, int a, int u)
+{
+ int ret;
+ unsigned long flags;
+ spin_lock_irqsave(ATOMIC_HASH(v), flags);
+ ret = v->counter;
+ if (ret != u)
+ v->counter += a;
spin_unlock_irqrestore(ATOMIC_HASH(v), flags);
spin_unlock_irqrestore(ATOMIC_HASH(v), flags);
+ return ret != u;
}
}
-EXPORT_SYMBOL(__atomic_add_return);
-EXPORT_SYMBOL(atomic_set);
+/* Atomic operations are already serializing */
+void atomic_set(atomic_t *v, int i)
+{
+ unsigned long flags;
+ spin_lock_irqsave(ATOMIC_HASH(v), flags);
+ v->counter = i;
+ spin_unlock_irqrestore(ATOMIC_HASH(v), flags);
+}
+EXPORT_SYMBOL(atomic_set);