include/asm-generic/atomic.h

   1 #ifndef _ASM_GENERIC_ATOMIC_H
   2 #define _ASM_GENERIC_ATOMIC_H
   3 /*
   4  * Copyright (C) 2005 Silicon Graphics, Inc.
   5  *      Christoph Lameter <clameter@sgi.com>
   6  *
   7  * Allows to provide arch independent atomic definitions without the need to
   8  * edit all arch specific atomic.h files.
   9  */
  10
  11 #include <asm/types.h>
  12
  13 /*
  14  * Suppport for atomic_long_t
  15  *
  16  * Casts for parameters are avoided for existing atomic functions in order to
  17  * avoid issues with cast-as-lval under gcc 4.x and other limitations that the
  18  * macros of a platform may have.
  19  */
  20
  21 #if BITS_PER_LONG == 64
  22
  23 typedef atomic64_t atomic_long_t;
  24
  25 #define ATOMIC_LONG_INIT(i)     ATOMIC64_INIT(i)
  26
  27 static inline long atomic_long_read(atomic_long_t *l)
  28 {
  29         atomic64_t *v = (atomic64_t *)l;
  30
  31         return (long)atomic64_read(v);
  32 }
  33
  34 static inline void atomic_long_set(atomic_long_t *l, long i)
  35 {
  36         atomic64_t *v = (atomic64_t *)l;
  37
  38         atomic64_set(v, i);
  39 }
  40
  41 static inline void atomic_long_inc(atomic_long_t *l)
  42 {
  43         atomic64_t *v = (atomic64_t *)l;
  44
  45         atomic64_inc(v);
  46 }
  47
  48 static inline void atomic_long_dec(atomic_long_t *l)
  49 {
  50         atomic64_t *v = (atomic64_t *)l;
  51
  52         atomic64_dec(v);
  53 }
  54
  55 static inline void atomic_long_add(long i, atomic_long_t *l)
  56 {
  57         atomic64_t *v = (atomic64_t *)l;
  58
  59         atomic64_add(i, v);
  60 }
  61
  62 static inline void atomic_long_sub(long i, atomic_long_t *l)
  63 {
  64         atomic64_t *v = (atomic64_t *)l;
  65
  66         atomic64_sub(i, v);
  67 }
  68
  69 #else  /*  BITS_PER_LONG == 64  */
  70
  71 typedef atomic_t atomic_long_t;
  72
  73 #define ATOMIC_LONG_INIT(i)     ATOMIC_INIT(i)
  74 static inline long atomic_long_read(atomic_long_t *l)
  75 {
  76         atomic_t *v = (atomic_t *)l;
  77
  78         return (long)atomic_read(v);
  79 }
  80
  81 static inline void atomic_long_set(atomic_long_t *l, long i)
  82 {
  83         atomic_t *v = (atomic_t *)l;
  84
  85         atomic_set(v, i);
  86 }
  87
  88 static inline void atomic_long_inc(atomic_long_t *l)
  89 {
  90         atomic_t *v = (atomic_t *)l;
  91
  92         atomic_inc(v);
  93 }
  94
  95 static inline void atomic_long_dec(atomic_long_t *l)
  96 {
  97         atomic_t *v = (atomic_t *)l;
  98
  99         atomic_dec(v);
 100 }
 101
 102 static inline void atomic_long_add(long i, atomic_long_t *l)
 103 {
 104         atomic_t *v = (atomic_t *)l;
 105
 106         atomic_add(i, v);
 107 }
 108
 109 static inline void atomic_long_sub(long i, atomic_long_t *l)
 110 {
 111         atomic_t *v = (atomic_t *)l;
 112
 113         atomic_sub(i, v);
 114 }
 115
 116 #endif  /*  BITS_PER_LONG == 64  */
 117
 118 #endif  /*  _ASM_GENERIC_ATOMIC_H  */