and changed files

[powerpc.git] / include / asm-powerpc / atomic.h

diff --git a/include/asm-powerpc/atomic.h b/include/asm-powerpc/atomic.h
index bb3c0ab..c44810b 100644 (file)
--- a/include/asm-powerpc/atomic.h
+++ b/include/asm-powerpc/atomic.h
@@ -11,6 +11,7 @@ typedef struct { volatile int counter; } atomic_t;
 #include <linux/compiler.h>
 #include <asm/synch.h>
 #include <asm/asm-compat.h>
+#include <asm/system.h>
 
 #define ATOMIC_INIT(i)         { (i) }
 
@@ -27,8 +28,8 @@ static __inline__ void atomic_add(int a, atomic_t *v)
        PPC405_ERR77(0,%3)
 "      stwcx.  %0,0,%3 \n\
        bne-    1b"
-       : "=&r" (t), "=m" (v->counter)
-       : "r" (a), "r" (&v->counter), "m" (v->counter)
+       : "=&r" (t), "+m" (v->counter)
+       : "r" (a), "r" (&v->counter)
        : "cc");
 }
 
@@ -63,8 +64,8 @@ static __inline__ void atomic_sub(int a, atomic_t *v)
        PPC405_ERR77(0,%3)
 "      stwcx.  %0,0,%3 \n\
        bne-    1b"
-       : "=&r" (t), "=m" (v->counter)
-       : "r" (a), "r" (&v->counter), "m" (v->counter)
+       : "=&r" (t), "+m" (v->counter)
+       : "r" (a), "r" (&v->counter)
        : "cc");
 }
 
@@ -97,8 +98,8 @@ static __inline__ void atomic_inc(atomic_t *v)
        PPC405_ERR77(0,%2)
 "      stwcx.  %0,0,%2 \n\
        bne-    1b"
-       : "=&r" (t), "=m" (v->counter)
-       : "r" (&v->counter), "m" (v->counter)
+       : "=&r" (t), "+m" (v->counter)
+       : "r" (&v->counter)
        : "cc");
 }
 
@@ -141,8 +142,8 @@ static __inline__ void atomic_dec(atomic_t *v)
        PPC405_ERR77(0,%2)\
 "      stwcx.  %0,0,%2\n\
        bne-    1b"
-       : "=&r" (t), "=m" (v->counter)
-       : "r" (&v->counter), "m" (v->counter)
+       : "=&r" (t), "+m" (v->counter)
+       : "r" (&v->counter)
        : "cc");
 }
 
@@ -165,7 +166,7 @@ static __inline__ int atomic_dec_return(atomic_t *v)
        return t;
 }
 
-#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
+#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 
 /**
@@ -207,7 +208,8 @@ static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
 
 /*
  * Atomically test *v and decrement if it is greater than 0.
- * The function returns the old value of *v minus 1.
+ * The function returns the old value of *v minus 1, even if
+ * the atomic variable, v, was not decremented.
  */
 static __inline__ int atomic_dec_if_positive(atomic_t *v)
 {
@@ -216,14 +218,15 @@ static __inline__ int atomic_dec_if_positive(atomic_t *v)
        __asm__ __volatile__(
        LWSYNC_ON_SMP
 "1:    lwarx   %0,0,%1         # atomic_dec_if_positive\n\
-       addic.  %0,%0,-1\n\
+       cmpwi   %0,1\n\
+       addi    %0,%0,-1\n\
        blt-    2f\n"
        PPC405_ERR77(0,%1)
 "      stwcx.  %0,0,%1\n\
        bne-    1b"
        ISYNC_ON_SMP
        "\n\
-2:"    : "=&r" (t)
+2:"    : "=&b" (t)
        : "r" (&v->counter)
        : "cc", "memory");
 
@@ -253,8 +256,8 @@ static __inline__ void atomic64_add(long a, atomic64_t *v)
        add     %0,%2,%0\n\
        stdcx.  %0,0,%3 \n\
        bne-    1b"
-       : "=&r" (t), "=m" (v->counter)
-       : "r" (a), "r" (&v->counter), "m" (v->counter)
+       : "=&r" (t), "+m" (v->counter)
+       : "r" (a), "r" (&v->counter)
        : "cc");
 }
 
@@ -287,8 +290,8 @@ static __inline__ void atomic64_sub(long a, atomic64_t *v)
        subf    %0,%2,%0\n\
        stdcx.  %0,0,%3 \n\
        bne-    1b"
-       : "=&r" (t), "=m" (v->counter)
-       : "r" (a), "r" (&v->counter), "m" (v->counter)
+       : "=&r" (t), "+m" (v->counter)
+       : "r" (a), "r" (&v->counter)
        : "cc");
 }
 
@@ -319,8 +322,8 @@ static __inline__ void atomic64_inc(atomic64_t *v)
        addic   %0,%0,1\n\
        stdcx.  %0,0,%2 \n\
        bne-    1b"
-       : "=&r" (t), "=m" (v->counter)
-       : "r" (&v->counter), "m" (v->counter)
+       : "=&r" (t), "+m" (v->counter)
+       : "r" (&v->counter)
        : "cc");
 }
 
@@ -361,8 +364,8 @@ static __inline__ void atomic64_dec(atomic64_t *v)
        addic   %0,%0,-1\n\
        stdcx.  %0,0,%2\n\
        bne-    1b"
-       : "=&r" (t), "=m" (v->counter)
-       : "r" (&v->counter), "m" (v->counter)
+       : "=&r" (t), "+m" (v->counter)
+       : "r" (&v->counter)
        : "cc");
 }
 
@@ -411,6 +414,42 @@ static __inline__ long atomic64_dec_if_positive(atomic64_t *v)
        return t;
 }
 
+#define atomic64_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
+#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
+
+/**
+ * atomic64_add_unless - add unless the number is a given value
+ * @v: pointer of type atomic64_t
+ * @a: the amount to add to v...
+ * @u: ...unless v is equal to u.
+ *
+ * Atomically adds @a to @v, so long as it was not @u.
+ * Returns non-zero if @v was not @u, and zero otherwise.
+ */
+static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
+{
+       long t;
+
+       __asm__ __volatile__ (
+       LWSYNC_ON_SMP
+"1:    ldarx   %0,0,%1         # atomic_add_unless\n\
+       cmpd    0,%0,%3 \n\
+       beq-    2f \n\
+       add     %0,%2,%0 \n"
+"      stdcx.  %0,0,%1 \n\
+       bne-    1b \n"
+       ISYNC_ON_SMP
+"      subf    %0,%2,%0 \n\
+2:"
+       : "=&r" (t)
+       : "r" (&v->counter), "r" (a), "r" (u)
+       : "cc", "memory");
+
+       return t != u;
+}
+
+#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
+
 #endif /* __powerpc64__ */
 
 #include <asm-generic/atomic.h>