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1996bda2 PZ |
1 | #ifndef _ASM_GENERIC_LOCAL64_H |
2 | #define _ASM_GENERIC_LOCAL64_H | |
3 | ||
4 | #include <linux/percpu.h> | |
5 | #include <asm/types.h> | |
6 | ||
7 | /* | |
8 | * A signed long type for operations which are atomic for a single CPU. | |
9 | * Usually used in combination with per-cpu variables. | |
10 | * | |
11 | * This is the default implementation, which uses atomic64_t. Which is | |
12 | * rather pointless. The whole point behind local64_t is that some processors | |
13 | * can perform atomic adds and subtracts in a manner which is atomic wrt IRQs | |
14 | * running on this CPU. local64_t allows exploitation of such capabilities. | |
15 | */ | |
16 | ||
17 | /* Implement in terms of atomics. */ | |
18 | ||
19 | #if BITS_PER_LONG == 64 | |
20 | ||
21 | #include <asm/local.h> | |
22 | ||
23 | typedef struct { | |
24 | local_t a; | |
25 | } local64_t; | |
26 | ||
27 | #define LOCAL64_INIT(i) { LOCAL_INIT(i) } | |
28 | ||
29 | #define local64_read(l) local_read(&(l)->a) | |
30 | #define local64_set(l,i) local_set((&(l)->a),(i)) | |
31 | #define local64_inc(l) local_inc(&(l)->a) | |
32 | #define local64_dec(l) local_dec(&(l)->a) | |
33 | #define local64_add(i,l) local_add((i),(&(l)->a)) | |
34 | #define local64_sub(i,l) local_sub((i),(&(l)->a)) | |
35 | ||
36 | #define local64_sub_and_test(i, l) local_sub_and_test((i), (&(l)->a)) | |
37 | #define local64_dec_and_test(l) local_dec_and_test(&(l)->a) | |
38 | #define local64_inc_and_test(l) local_inc_and_test(&(l)->a) | |
39 | #define local64_add_negative(i, l) local_add_negative((i), (&(l)->a)) | |
40 | #define local64_add_return(i, l) local_add_return((i), (&(l)->a)) | |
41 | #define local64_sub_return(i, l) local_sub_return((i), (&(l)->a)) | |
42 | #define local64_inc_return(l) local_inc_return(&(l)->a) | |
43 | ||
44 | #define local64_cmpxchg(l, o, n) local_cmpxchg((&(l)->a), (o), (n)) | |
45 | #define local64_xchg(l, n) local_xchg((&(l)->a), (n)) | |
46 | #define local64_add_unless(l, _a, u) local_add_unless((&(l)->a), (_a), (u)) | |
47 | #define local64_inc_not_zero(l) local_inc_not_zero(&(l)->a) | |
48 | ||
49 | /* Non-atomic variants, ie. preemption disabled and won't be touched | |
50 | * in interrupt, etc. Some archs can optimize this case well. */ | |
51 | #define __local64_inc(l) local64_set((l), local64_read(l) + 1) | |
52 | #define __local64_dec(l) local64_set((l), local64_read(l) - 1) | |
53 | #define __local64_add(i,l) local64_set((l), local64_read(l) + (i)) | |
54 | #define __local64_sub(i,l) local64_set((l), local64_read(l) - (i)) | |
55 | ||
56 | #else /* BITS_PER_LONG != 64 */ | |
57 | ||
60063497 | 58 | #include <linux/atomic.h> |
1996bda2 PZ |
59 | |
60 | /* Don't use typedef: don't want them to be mixed with atomic_t's. */ | |
61 | typedef struct { | |
62 | atomic64_t a; | |
63 | } local64_t; | |
64 | ||
65 | #define LOCAL64_INIT(i) { ATOMIC_LONG_INIT(i) } | |
66 | ||
67 | #define local64_read(l) atomic64_read(&(l)->a) | |
68 | #define local64_set(l,i) atomic64_set((&(l)->a),(i)) | |
69 | #define local64_inc(l) atomic64_inc(&(l)->a) | |
70 | #define local64_dec(l) atomic64_dec(&(l)->a) | |
71 | #define local64_add(i,l) atomic64_add((i),(&(l)->a)) | |
72 | #define local64_sub(i,l) atomic64_sub((i),(&(l)->a)) | |
73 | ||
74 | #define local64_sub_and_test(i, l) atomic64_sub_and_test((i), (&(l)->a)) | |
75 | #define local64_dec_and_test(l) atomic64_dec_and_test(&(l)->a) | |
76 | #define local64_inc_and_test(l) atomic64_inc_and_test(&(l)->a) | |
77 | #define local64_add_negative(i, l) atomic64_add_negative((i), (&(l)->a)) | |
78 | #define local64_add_return(i, l) atomic64_add_return((i), (&(l)->a)) | |
79 | #define local64_sub_return(i, l) atomic64_sub_return((i), (&(l)->a)) | |
80 | #define local64_inc_return(l) atomic64_inc_return(&(l)->a) | |
81 | ||
82 | #define local64_cmpxchg(l, o, n) atomic64_cmpxchg((&(l)->a), (o), (n)) | |
83 | #define local64_xchg(l, n) atomic64_xchg((&(l)->a), (n)) | |
84 | #define local64_add_unless(l, _a, u) atomic64_add_unless((&(l)->a), (_a), (u)) | |
85 | #define local64_inc_not_zero(l) atomic64_inc_not_zero(&(l)->a) | |
86 | ||
87 | /* Non-atomic variants, ie. preemption disabled and won't be touched | |
88 | * in interrupt, etc. Some archs can optimize this case well. */ | |
89 | #define __local64_inc(l) local64_set((l), local64_read(l) + 1) | |
90 | #define __local64_dec(l) local64_set((l), local64_read(l) - 1) | |
91 | #define __local64_add(i,l) local64_set((l), local64_read(l) + (i)) | |
92 | #define __local64_sub(i,l) local64_set((l), local64_read(l) - (i)) | |
93 | ||
94 | #endif /* BITS_PER_LONG != 64 */ | |
95 | ||
96 | #endif /* _ASM_GENERIC_LOCAL64_H */ |