Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

[pandora-kernel.git] / arch / sh / include / asm / atomic.h

diff --git a/arch/sh/include/asm/atomic.h b/arch/sh/include/asm/atomic.h
index b16388d..c798312 100644 (file)
--- a/arch/sh/include/asm/atomic.h
+++ b/arch/sh/include/asm/atomic.h
@@ -13,7 +13,7 @@
 
 #define ATOMIC_INIT(i) ( (atomic_t) { (i) } )
 
-#define atomic_read(v)         ((v)->counter)
+#define atomic_read(v)         (*(volatile int *)&(v)->counter)
 #define atomic_set(v,i)                ((v)->counter = (i))
 
 #if defined(CONFIG_GUSA_RB)
@@ -25,58 +25,43 @@
 #endif
 
 #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))
+#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_not_zero(v)         atomic_add_unless((v), 1, 0)
 
-#define atomic_dec_return(v) atomic_sub_return(1,(v))
-#define atomic_inc_return(v) atomic_add_return(1,(v))
+#define atomic_inc(v)                  atomic_add(1, (v))
+#define atomic_dec(v)                  atomic_sub(1, (v))
 
-/*
- * atomic_inc_and_test - increment and test
+#define atomic_xchg(v, new)            (xchg(&((v)->counter), new))
+#define atomic_cmpxchg(v, o, n)                (cmpxchg(&((v)->counter), (o), (n)))
+
+/**
+ * atomic_add_unless - add unless the number is a given value
  * @v: pointer of type atomic_t
+ * @a: the amount to add to v...
+ * @u: ...unless v is equal to u.
  *
- * Atomically increments @v by 1
- * and returns true if the result is zero, or false for all
- * other cases.
+ * Atomically adds @a to @v, so long as it was not @u.
+ * Returns non-zero if @v was not @u, and zero otherwise.
  */
-#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))
-
-#if !defined(CONFIG_GUSA_RB) && !defined(CONFIG_CPU_SH4A)
-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;
+       int c, old;
+       c = atomic_read(v);
+       for (;;) {
+               if (unlikely(c == (u)))
+                       break;
+               old = atomic_cmpxchg((v), c, c + (a));
+               if (likely(old == c))
+                       break;
+               c = old;
+       }
+
+       return c != (u);
 }
-#endif /* !CONFIG_GUSA_RB && !CONFIG_CPU_SH4A */
-
-#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
-#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
 
 #define smp_mb__before_atomic_dec()    smp_mb()
 #define smp_mb__after_atomic_dec()     smp_mb()