arch/alpha/include/asm/cmpxchg.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ALPHA_CMPXCHG_H
   3 #define _ALPHA_CMPXCHG_H
   4
   5 /*
   6  * Atomic exchange routines.
   7  */
   8
   9 #define ____xchg(type, args...)         __xchg ## type ## _local(args)
  10 #define ____cmpxchg(type, args...)      __cmpxchg ## type ## _local(args)
  11 #include <asm/xchg.h>
  12
  13 #define xchg_local(ptr, x)                                              \
  14 ({                                                                      \
  15         __typeof__(*(ptr)) _x_ = (x);                                   \
  16         (__typeof__(*(ptr))) __xchg_local((ptr), (unsigned long)_x_,    \
  17                                        sizeof(*(ptr)));                 \
  18 })
  19
  20 #define cmpxchg_local(ptr, o, n)                                        \
  21 ({                                                                      \
  22         __typeof__(*(ptr)) _o_ = (o);                                   \
  23         __typeof__(*(ptr)) _n_ = (n);                                   \
  24         (__typeof__(*(ptr))) __cmpxchg_local((ptr), (unsigned long)_o_, \
  25                                           (unsigned long)_n_,           \
  26                                           sizeof(*(ptr)));              \
  27 })
  28
  29 #define cmpxchg64_local(ptr, o, n)                                      \
  30 ({                                                                      \
  31         BUILD_BUG_ON(sizeof(*(ptr)) != 8);                              \
  32         cmpxchg_local((ptr), (o), (n));                                 \
  33 })
  34
  35 #undef ____xchg
  36 #undef ____cmpxchg
  37 #define ____xchg(type, args...)         __xchg ##type(args)
  38 #define ____cmpxchg(type, args...)      __cmpxchg ##type(args)
  39 #include <asm/xchg.h>
  40
  41 /*
  42  * The leading and the trailing memory barriers guarantee that these
  43  * operations are fully ordered.
  44  */
  45 #define xchg(ptr, x)                                                    \
  46 ({                                                                      \
  47         __typeof__(*(ptr)) __ret;                                       \
  48         __typeof__(*(ptr)) _x_ = (x);                                   \
  49         smp_mb();                                                       \
  50         __ret = (__typeof__(*(ptr)))                                    \
  51                 __xchg((ptr), (unsigned long)_x_, sizeof(*(ptr)));      \
  52         smp_mb();                                                       \
  53         __ret;                                                          \
  54 })
  55
  56 #define cmpxchg(ptr, o, n)                                              \
  57 ({                                                                      \
  58         __typeof__(*(ptr)) __ret;                                       \
  59         __typeof__(*(ptr)) _o_ = (o);                                   \
  60         __typeof__(*(ptr)) _n_ = (n);                                   \
  61         smp_mb();                                                       \
  62         __ret = (__typeof__(*(ptr))) __cmpxchg((ptr),                   \
  63                 (unsigned long)_o_, (unsigned long)_n_, sizeof(*(ptr)));\
  64         smp_mb();                                                       \
  65         __ret;                                                          \
  66 })
  67
  68 #define cmpxchg64(ptr, o, n)                                            \
  69 ({                                                                      \
  70         BUILD_BUG_ON(sizeof(*(ptr)) != 8);                              \
  71         cmpxchg((ptr), (o), (n));                                       \
  72 })
  73
  74 #undef ____cmpxchg
  75
  76 #endif /* _ALPHA_CMPXCHG_H */