patch-2_6_7-vs1_9_1_12

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

diff --git a/include/asm-arm/atomic.h b/include/asm-arm/atomic.h
index 61227d1..257d32f 100644 (file)
--- a/include/asm-arm/atomic.h
+++ b/include/asm-arm/atomic.h
@@ -59,50 +59,47 @@ static inline void atomic_add(int i, atomic_t *v)
        : "cc");
 }
 
-static inline void atomic_sub(int i, atomic_t *v)
+static inline int atomic_add_return(int i, atomic_t *v)
 {
-       unsigned long tmp, tmp2;
+       unsigned long tmp;
+       int result;
 
-       __asm__ __volatile__("@ atomic_sub\n"
+       __asm__ __volatile__("@ atomic_add_return\n"
 "1:    ldrex   %0, [%2]\n"
-"      sub     %0, %0, %3\n"
+"      add     %0, %0, %3\n"
 "      strex   %1, %0, [%2]\n"
 "      teq     %1, #0\n"
 "      bne     1b"
-       : "=&r" (tmp), "=&r" (tmp2)
+       : "=&r" (result), "=&r" (tmp)
        : "r" (&v->counter), "Ir" (i)
        : "cc");
-}
 
-#define atomic_inc(v)  atomic_add(1, v)
-#define atomic_dec(v)  atomic_sub(1, v)
+       return result;
+}
 
-static inline int atomic_dec_and_test(atomic_t *v)
+static inline void atomic_sub(int i, atomic_t *v)
 {
-       unsigned long tmp;
-       int result;
+       unsigned long tmp, tmp2;
 
-       __asm__ __volatile__("@ atomic_dec_and_test\n"
+       __asm__ __volatile__("@ atomic_sub\n"
 "1:    ldrex   %0, [%2]\n"
-"      sub     %0, %0, #1\n"
+"      sub     %0, %0, %3\n"
 "      strex   %1, %0, [%2]\n"
 "      teq     %1, #0\n"
 "      bne     1b"
-       : "=&r" (result), "=&r" (tmp)
-       : "r" (&v->counter)
+       : "=&r" (tmp), "=&r" (tmp2)
+       : "r" (&v->counter), "Ir" (i)
        : "cc");
-
-       return result == 0;
 }
 
-static inline int atomic_add_negative(int i, atomic_t *v)
+static inline int atomic_sub_return(int i, atomic_t *v)
 {
        unsigned long tmp;
        int result;
 
-       __asm__ __volatile__("@ atomic_add_negative\n"
+       __asm__ __volatile__("@ atomic_sub_return\n"
 "1:    ldrex   %0, [%2]\n"
-"      add     %0, %0, %3\n"
+"      sub     %0, %0, %3\n"
 "      strex   %1, %0, [%2]\n"
 "      teq     %1, #0\n"
 "      bne     1b"
@@ -110,7 +107,7 @@ static inline int atomic_add_negative(int i, atomic_t *v)
        : "r" (&v->counter), "Ir" (i)
        : "cc");
 
-       return result < 0;
+       return result;
 }
 
 static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
@@ -147,57 +144,39 @@ static inline void atomic_add(int i, atomic_t *v)
        local_irq_restore(flags);
 }
 
-static inline void atomic_sub(int i, atomic_t *v)
-{
-       unsigned long flags;
-
-       local_irq_save(flags);
-       v->counter -= i;
-       local_irq_restore(flags);
-}
-
-static inline void atomic_inc(atomic_t *v)
+static inline int atomic_add_return(int i, atomic_t *v)
 {
        unsigned long flags;
+       int val;
 
        local_irq_save(flags);
-       v->counter += 1;
+       val = v->counter;
+       v->counter = val += i;
        local_irq_restore(flags);
-}
 
-static inline void atomic_dec(atomic_t *v)
-{
-       unsigned long flags;
-
-       local_irq_save(flags);
-       v->counter -= 1;
-       local_irq_restore(flags);
+       return val;
 }
 
-static inline int atomic_dec_and_test(atomic_t *v)
+static inline void atomic_sub(int i, atomic_t *v)
 {
        unsigned long flags;
-       int val;
 
        local_irq_save(flags);
-       val = v->counter;
-       v->counter = val -= 1;
+       v->counter -= i;
        local_irq_restore(flags);
-
-       return val == 0;
 }
 
-static inline int atomic_add_negative(int i, atomic_t *v)
+static inline int atomic_sub_return(int i, atomic_t *v)
 {
        unsigned long flags;
        int val;
 
        local_irq_save(flags);
        val = v->counter;
-       v->counter = val += i;
+       v->counter = val -= i;
        local_irq_restore(flags);
 
-       return val < 0;
+       return val;
 }
 
 static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
@@ -211,6 +190,14 @@ static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
 
 #endif /* __LINUX_ARM_ARCH__ */
 
+#define atomic_inc(v)          atomic_add(1, v)
+#define atomic_dec(v)          atomic_sub(1, v)
+
+#define atomic_inc_and_test(v) (atomic_add_return(1, v) == 0)
+#define atomic_dec_and_test(v) (atomic_sub_return(1, v) == 0)
+
+#define atomic_add_negative(i,v) (atomic_add_return(i, v) < 0)
+
 /* Atomic operations are already serializing on ARM */
 #define smp_mb__before_atomic_dec()    barrier()
 #define smp_mb__after_atomic_dec()     barrier()