diff options
Diffstat (limited to 'arch/sparc/lib/atomic32.c')
| -rw-r--r-- | arch/sparc/lib/atomic32.c | 33 |
1 files changed, 29 insertions, 4 deletions
diff --git a/arch/sparc/lib/atomic32.c b/arch/sparc/lib/atomic32.c index 2e64e8c3e8e..de84f8534ba 100644 --- a/arch/sparc/lib/atomic32.c +++ b/arch/sparc/lib/atomic32.c @@ -37,17 +37,42 @@ int __atomic_add_return(int i, atomic_t *v) 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; + 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); + 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); |