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-rw-r--r--include/asm-arm26/atomic.h29
1 files changed, 29 insertions, 0 deletions
diff --git a/include/asm-arm26/atomic.h b/include/asm-arm26/atomic.h
index 4a88235c0e7..a47cadc5968 100644
--- a/include/asm-arm26/atomic.h
+++ b/include/asm-arm26/atomic.h
@@ -62,6 +62,35 @@ static inline int atomic_sub_return(int i, atomic_t *v)
return val;
}
+static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
+{
+ int ret;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ ret = v->counter;
+ if (likely(ret == old))
+ v->counter = new;
+ local_irq_restore(flags);
+
+ return ret;
+}
+
+static inline int atomic_add_unless(atomic_t *v, int a, int u)
+{
+ int ret;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ ret = v->counter;
+ if (ret != u)
+ v->counter += a;
+ local_irq_restore(flags);
+
+ return ret != u;
+}
+#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
+
static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
{
unsigned long flags;