root/arch/sparc/include/asm/atomic_64.h

INCLUDED FROM

DEFINITIONS

1. atomic_xchg

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /* atomic.h: Thankfully the V9 is at least reasonable for this
   3  *           stuff.
   4  *
   5  * Copyright (C) 1996, 1997, 2000, 2012 David S. Miller (davem@redhat.com)
   6  */
   7 
   8 #ifndef __ARCH_SPARC64_ATOMIC__
   9 #define __ARCH_SPARC64_ATOMIC__
  10 
  11 #include <linux/types.h>
  12 #include <asm/cmpxchg.h>
  13 #include <asm/barrier.h>
  14 
  15 #define ATOMIC_INIT(i)          { (i) }
  16 #define ATOMIC64_INIT(i)        { (i) }
  17 
  18 #define atomic_read(v)          READ_ONCE((v)->counter)
  19 #define atomic64_read(v)        READ_ONCE((v)->counter)
  20 
  21 #define atomic_set(v, i)        WRITE_ONCE(((v)->counter), (i))
  22 #define atomic64_set(v, i)      WRITE_ONCE(((v)->counter), (i))
  23 
  24 #define ATOMIC_OP(op)                                                   \
  25 void atomic_##op(int, atomic_t *);                                      \
  26 void atomic64_##op(s64, atomic64_t *);
  27 
  28 #define ATOMIC_OP_RETURN(op)                                            \
  29 int atomic_##op##_return(int, atomic_t *);                              \
  30 s64 atomic64_##op##_return(s64, atomic64_t *);
  31 
  32 #define ATOMIC_FETCH_OP(op)                                             \
  33 int atomic_fetch_##op(int, atomic_t *);                                 \
  34 s64 atomic64_fetch_##op(s64, atomic64_t *);
  35 
  36 #define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op) ATOMIC_FETCH_OP(op)
  37 
  38 ATOMIC_OPS(add)
  39 ATOMIC_OPS(sub)
  40 
  41 #undef ATOMIC_OPS
  42 #define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_FETCH_OP(op)
  43 
  44 ATOMIC_OPS(and)
  45 ATOMIC_OPS(or)
  46 ATOMIC_OPS(xor)
  47 
  48 #undef ATOMIC_OPS
  49 #undef ATOMIC_FETCH_OP
  50 #undef ATOMIC_OP_RETURN
  51 #undef ATOMIC_OP
  52 
  53 #define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
  54 
  55 static inline int atomic_xchg(atomic_t *v, int new)
  56 {
  57         return xchg(&v->counter, new);
  58 }
  59 
  60 #define atomic64_cmpxchg(v, o, n) \
  61         ((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n)))
  62 #define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
  63 
  64 s64 atomic64_dec_if_positive(atomic64_t *v);
  65 #define atomic64_dec_if_positive atomic64_dec_if_positive
  66 
  67 #endif /* !(__ARCH_SPARC64_ATOMIC__) */