1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* atomic.h: Thankfully the V9 is at least reasonable for this
5 * Copyright (C) 1996, 1997, 2000, 2012 David S. Miller (davem@redhat.com)
8 #ifndef __ARCH_SPARC64_ATOMIC__
9 #define __ARCH_SPARC64_ATOMIC__
11 #include <linux/types.h>
12 #include <asm/cmpxchg.h>
13 #include <asm/barrier.h>
15 #define ATOMIC_INIT(i) { (i) }
16 #define ATOMIC64_INIT(i) { (i) }
18 #define atomic_read(v) READ_ONCE((v)->counter)
19 #define atomic64_read(v) READ_ONCE((v)->counter)
21 #define atomic_set(v, i) WRITE_ONCE(((v)->counter), (i))
22 #define atomic64_set(v, i) WRITE_ONCE(((v)->counter), (i))
24 #define ATOMIC_OP(op) \
25 void atomic_##op(int, atomic_t *); \
26 void atomic64_##op(long, atomic64_t *);
28 #define ATOMIC_OP_RETURN(op) \
29 int atomic_##op##_return(int, atomic_t *); \
30 long atomic64_##op##_return(long, atomic64_t *);
32 #define ATOMIC_FETCH_OP(op) \
33 int atomic_fetch_##op(int, atomic_t *); \
34 long atomic64_fetch_##op(long, atomic64_t *);
36 #define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op) ATOMIC_FETCH_OP(op)
42 #define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_FETCH_OP(op)
49 #undef ATOMIC_FETCH_OP
50 #undef ATOMIC_OP_RETURN
53 #define atomic_dec_return(v) atomic_sub_return(1, v)
54 #define atomic64_dec_return(v) atomic64_sub_return(1, v)
56 #define atomic_inc_return(v) atomic_add_return(1, v)
57 #define atomic64_inc_return(v) atomic64_add_return(1, v)
60 * atomic_inc_and_test - increment and test
61 * @v: pointer of type atomic_t
63 * Atomically increments @v by 1
64 * and returns true if the result is zero, or false for all
67 #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
68 #define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0)
70 #define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0)
71 #define atomic64_sub_and_test(i, v) (atomic64_sub_return(i, v) == 0)
73 #define atomic_dec_and_test(v) (atomic_sub_return(1, v) == 0)
74 #define atomic64_dec_and_test(v) (atomic64_sub_return(1, v) == 0)
76 #define atomic_inc(v) atomic_add(1, v)
77 #define atomic64_inc(v) atomic64_add(1, v)
79 #define atomic_dec(v) atomic_sub(1, v)
80 #define atomic64_dec(v) atomic64_sub(1, v)
82 #define atomic_add_negative(i, v) (atomic_add_return(i, v) < 0)
83 #define atomic64_add_negative(i, v) (atomic64_add_return(i, v) < 0)
85 #define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
87 static inline int atomic_xchg(atomic_t *v, int new)
89 return xchg(&v->counter, new);
92 static inline int __atomic_add_unless(atomic_t *v, int a, int u)
97 if (unlikely(c == (u)))
99 old = atomic_cmpxchg((v), c, c + (a));
100 if (likely(old == c))
107 #define atomic64_cmpxchg(v, o, n) \
108 ((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n)))
109 #define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
111 static inline long atomic64_add_unless(atomic64_t *v, long a, long u)
114 c = atomic64_read(v);
116 if (unlikely(c == (u)))
118 old = atomic64_cmpxchg((v), c, c + (a));
119 if (likely(old == c))
126 #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
128 long atomic64_dec_if_positive(atomic64_t *v);
130 #endif /* !(__ARCH_SPARC64_ATOMIC__) */