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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - include/asm-sparc64/atomic.h
1 /* atomic.h: Thankfully the V9 is at least reasonable for this
4 * Copyright (C) 1996, 1997, 2000 David S. Miller (davem@redhat.com)
7 #ifndef __ARCH_SPARC64_ATOMIC__
8 #define __ARCH_SPARC64_ATOMIC__
10 #include <linux/types.h>
11 #include <asm/system.h>
13 typedef struct { volatile int counter
; } atomic_t
;
14 typedef struct { volatile __s64 counter
; } atomic64_t
;
16 #define ATOMIC_INIT(i) { (i) }
17 #define ATOMIC64_INIT(i) { (i) }
19 #define atomic_read(v) ((v)->counter)
20 #define atomic64_read(v) ((v)->counter)
22 #define atomic_set(v, i) (((v)->counter) = i)
23 #define atomic64_set(v, i) (((v)->counter) = i)
25 extern void atomic_add(int, atomic_t
*);
26 extern void atomic64_add(int, atomic64_t
*);
27 extern void atomic_sub(int, atomic_t
*);
28 extern void atomic64_sub(int, atomic64_t
*);
30 extern int atomic_add_ret(int, atomic_t
*);
31 extern int atomic64_add_ret(int, atomic64_t
*);
32 extern int atomic_sub_ret(int, atomic_t
*);
33 extern int atomic64_sub_ret(int, atomic64_t
*);
35 #define atomic_dec_return(v) atomic_sub_ret(1, v)
36 #define atomic64_dec_return(v) atomic64_sub_ret(1, v)
38 #define atomic_inc_return(v) atomic_add_ret(1, v)
39 #define atomic64_inc_return(v) atomic64_add_ret(1, v)
41 #define atomic_sub_return(i, v) atomic_sub_ret(i, v)
42 #define atomic64_sub_return(i, v) atomic64_sub_ret(i, v)
44 #define atomic_add_return(i, v) atomic_add_ret(i, v)
45 #define atomic64_add_return(i, v) atomic64_add_ret(i, v)
48 * atomic_inc_and_test - increment and test
49 * @v: pointer of type atomic_t
51 * Atomically increments @v by 1
52 * and returns true if the result is zero, or false for all
55 #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
56 #define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0)
58 #define atomic_sub_and_test(i, v) (atomic_sub_ret(i, v) == 0)
59 #define atomic64_sub_and_test(i, v) (atomic64_sub_ret(i, v) == 0)
61 #define atomic_dec_and_test(v) (atomic_sub_ret(1, v) == 0)
62 #define atomic64_dec_and_test(v) (atomic64_sub_ret(1, v) == 0)
64 #define atomic_inc(v) atomic_add(1, v)
65 #define atomic64_inc(v) atomic64_add(1, v)
67 #define atomic_dec(v) atomic_sub(1, v)
68 #define atomic64_dec(v) atomic64_sub(1, v)
70 #define atomic_add_negative(i, v) (atomic_add_ret(i, v) < 0)
71 #define atomic64_add_negative(i, v) (atomic64_add_ret(i, v) < 0)
73 #define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
74 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
76 static inline int atomic_add_unless(atomic_t
*v
, int a
, int u
)
81 if (unlikely(c
== (u
)))
83 old
= atomic_cmpxchg((v
), c
, c
+ (a
));
91 #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
93 #define atomic64_cmpxchg(v, o, n) \
94 ((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n)))
95 #define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
97 static inline int atomic64_add_unless(atomic64_t
*v
, long a
, long u
)
100 c
= atomic64_read(v
);
102 if (unlikely(c
== (u
)))
104 old
= atomic64_cmpxchg((v
), c
, c
+ (a
));
105 if (likely(old
== c
))
112 #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
114 /* Atomic operations are already serializing */
116 #define smp_mb__before_atomic_dec() membar_storeload_loadload();
117 #define smp_mb__after_atomic_dec() membar_storeload_storestore();
118 #define smp_mb__before_atomic_inc() membar_storeload_loadload();
119 #define smp_mb__after_atomic_inc() membar_storeload_storestore();
121 #define smp_mb__before_atomic_dec() barrier()
122 #define smp_mb__after_atomic_dec() barrier()
123 #define smp_mb__before_atomic_inc() barrier()
124 #define smp_mb__after_atomic_inc() barrier()
127 #include <asm-generic/atomic.h>
128 #endif /* !(__ARCH_SPARC64_ATOMIC__) */