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git.proxmox.com Git - mirror_ubuntu-focal-kernel.git/blob - arch/sparc/include/asm/atomic_64.h
1 /* atomic.h: Thankfully the V9 is at least reasonable for this
4 * Copyright (C) 1996, 1997, 2000, 2012 David S. Miller (davem@redhat.com)
7 #ifndef __ARCH_SPARC64_ATOMIC__
8 #define __ARCH_SPARC64_ATOMIC__
10 #include <linux/types.h>
11 #include <asm/cmpxchg.h>
12 #include <asm/barrier.h>
14 #define ATOMIC_INIT(i) { (i) }
15 #define ATOMIC64_INIT(i) { (i) }
17 #define atomic_read(v) READ_ONCE((v)->counter)
18 #define atomic64_read(v) READ_ONCE((v)->counter)
20 #define atomic_set(v, i) WRITE_ONCE(((v)->counter), (i))
21 #define atomic64_set(v, i) WRITE_ONCE(((v)->counter), (i))
23 #define ATOMIC_OP(op) \
24 void atomic_##op(int, atomic_t *); \
25 void atomic64_##op(long, atomic64_t *);
27 #define ATOMIC_OP_RETURN(op) \
28 int atomic_##op##_return(int, atomic_t *); \
29 long atomic64_##op##_return(long, atomic64_t *);
31 #define ATOMIC_FETCH_OP(op) \
32 int atomic_fetch_##op(int, atomic_t *); \
33 long atomic64_fetch_##op(long, atomic64_t *);
35 #define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op) ATOMIC_FETCH_OP(op)
41 #define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_FETCH_OP(op)
48 #undef ATOMIC_FETCH_OP
49 #undef ATOMIC_OP_RETURN
52 #define atomic_dec_return(v) atomic_sub_return(1, v)
53 #define atomic64_dec_return(v) atomic64_sub_return(1, v)
55 #define atomic_inc_return(v) atomic_add_return(1, v)
56 #define atomic64_inc_return(v) atomic64_add_return(1, v)
59 * atomic_inc_and_test - increment and test
60 * @v: pointer of type atomic_t
62 * Atomically increments @v by 1
63 * and returns true if the result is zero, or false for all
66 #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
67 #define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0)
69 #define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0)
70 #define atomic64_sub_and_test(i, v) (atomic64_sub_return(i, v) == 0)
72 #define atomic_dec_and_test(v) (atomic_sub_return(1, v) == 0)
73 #define atomic64_dec_and_test(v) (atomic64_sub_return(1, v) == 0)
75 #define atomic_inc(v) atomic_add(1, v)
76 #define atomic64_inc(v) atomic64_add(1, v)
78 #define atomic_dec(v) atomic_sub(1, v)
79 #define atomic64_dec(v) atomic64_sub(1, v)
81 #define atomic_add_negative(i, v) (atomic_add_return(i, v) < 0)
82 #define atomic64_add_negative(i, v) (atomic64_add_return(i, v) < 0)
84 #define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
85 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
87 static inline int __atomic_add_unless(atomic_t
*v
, int a
, int u
)
92 if (unlikely(c
== (u
)))
94 old
= atomic_cmpxchg((v
), c
, c
+ (a
));
102 #define atomic64_cmpxchg(v, o, n) \
103 ((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n)))
104 #define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
106 static inline long atomic64_add_unless(atomic64_t
*v
, long a
, long u
)
109 c
= atomic64_read(v
);
111 if (unlikely(c
== (u
)))
113 old
= atomic64_cmpxchg((v
), c
, c
+ (a
));
114 if (likely(old
== c
))
121 #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
123 long atomic64_dec_if_positive(atomic64_t
*v
);
125 #endif /* !(__ARCH_SPARC64_ATOMIC__) */