fedora core 6 1.2949 + vserver 2.2.0

[linux-2.6.git] / include / asm-sh / atomic.h

diff --git a/include/asm-sh/atomic.h b/include/asm-sh/atomic.h
index e95641a..e12570b 100644 (file)
--- a/include/asm-sh/atomic.h
+++ b/include/asm-sh/atomic.h
@@ -14,84 +14,66 @@ typedef struct { volatile int counter; } atomic_t;
 #define atomic_read(v)         ((v)->counter)
 #define atomic_set(v,i)                ((v)->counter = (i))
 
+#include <linux/compiler.h>
 #include <asm/system.h>
 
-/*
- * To get proper branch prediction for the main line, we must branch
- * forward to code at the end of this object's .text section, then
- * branch back to restart the operation.
- */
-
-static __inline__ void atomic_add(int i, atomic_t * v)
-{
-       unsigned long flags;
-
-       local_irq_save(flags);
-       *(long *)v += i;
-       local_irq_restore(flags);
-}
-
-static __inline__ void atomic_sub(int i, atomic_t *v)
-{
-       unsigned long flags;
-
-       local_irq_save(flags);
-       *(long *)v -= i;
-       local_irq_restore(flags);
-}
-
-static __inline__ int atomic_add_return(int i, atomic_t * v)
-{
-       unsigned long temp, flags;
+#ifdef CONFIG_CPU_SH4A
+#include <asm/atomic-llsc.h>
+#else
+#include <asm/atomic-irq.h>
+#endif
 
-       local_irq_save(flags);
-       temp = *(long *)v;
-       temp += i;
-       *(long *)v = temp;
-       local_irq_restore(flags);
-
-       return temp;
-}
-
-static __inline__ int atomic_sub_return(int i, atomic_t * v)
-{
-       unsigned long temp, flags;
-
-       local_irq_save(flags);
-       temp = *(long *)v;
-       temp -= i;
-       *(long *)v = temp;
-       local_irq_restore(flags);
-
-       return temp;
-}
+#define atomic_add_negative(a, v)      (atomic_add_return((a), (v)) < 0)
 
 #define atomic_dec_return(v) atomic_sub_return(1,(v))
 #define atomic_inc_return(v) atomic_add_return(1,(v))
 
+/*
+ * atomic_inc_and_test - increment and test
+ * @v: pointer of type atomic_t
+ *
+ * Atomically increments @v by 1
+ * and returns true if the result is zero, or false for all
+ * other cases.
+ */
+#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
+
 #define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)
 #define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
 
 #define atomic_inc(v) atomic_add(1,(v))
 #define atomic_dec(v) atomic_sub(1,(v))
 
-static __inline__ void atomic_clear_mask(unsigned int mask, atomic_t *v)
+static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
 {
+       int ret;
        unsigned long flags;
 
        local_irq_save(flags);
-       *(long *)v &= ~mask;
+       ret = v->counter;
+       if (likely(ret == old))
+               v->counter = new;
        local_irq_restore(flags);
+
+       return ret;
 }
 
-static __inline__ void atomic_set_mask(unsigned int mask, atomic_t *v)
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
+static inline int atomic_add_unless(atomic_t *v, int a, int u)
 {
+       int ret;
        unsigned long flags;
 
        local_irq_save(flags);
-       *(long *)v |= mask;
+       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)
 
 /* Atomic operations are already serializing on SH */
 #define smp_mb__before_atomic_dec()    barrier()
@@ -99,4 +81,5 @@ static __inline__ void atomic_set_mask(unsigned int mask, atomic_t *v)
 #define smp_mb__before_atomic_inc()    barrier()
 #define smp_mb__after_atomic_inc()     barrier()
 
+#include <asm-generic/atomic.h>
 #endif /* __ASM_SH_ATOMIC_H */