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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1996bda2 PZ |
2 | #ifndef _ASM_GENERIC_LOCAL64_H |
3 | #define _ASM_GENERIC_LOCAL64_H | |
4 | ||
5 | #include <linux/percpu.h> | |
6 | #include <asm/types.h> | |
7 | ||
8 | /* | |
9 | * A signed long type for operations which are atomic for a single CPU. | |
10 | * Usually used in combination with per-cpu variables. | |
11 | * | |
12 | * This is the default implementation, which uses atomic64_t. Which is | |
13 | * rather pointless. The whole point behind local64_t is that some processors | |
14 | * can perform atomic adds and subtracts in a manner which is atomic wrt IRQs | |
15 | * running on this CPU. local64_t allows exploitation of such capabilities. | |
16 | */ | |
17 | ||
18 | /* Implement in terms of atomics. */ | |
19 | ||
20 | #if BITS_PER_LONG == 64 | |
21 | ||
22 | #include <asm/local.h> | |
23 | ||
24 | typedef struct { | |
25 | local_t a; | |
26 | } local64_t; | |
27 | ||
28 | #define LOCAL64_INIT(i) { LOCAL_INIT(i) } | |
29 | ||
30 | #define local64_read(l) local_read(&(l)->a) | |
31 | #define local64_set(l,i) local_set((&(l)->a),(i)) | |
32 | #define local64_inc(l) local_inc(&(l)->a) | |
33 | #define local64_dec(l) local_dec(&(l)->a) | |
34 | #define local64_add(i,l) local_add((i),(&(l)->a)) | |
35 | #define local64_sub(i,l) local_sub((i),(&(l)->a)) | |
36 | ||
37 | #define local64_sub_and_test(i, l) local_sub_and_test((i), (&(l)->a)) | |
38 | #define local64_dec_and_test(l) local_dec_and_test(&(l)->a) | |
39 | #define local64_inc_and_test(l) local_inc_and_test(&(l)->a) | |
40 | #define local64_add_negative(i, l) local_add_negative((i), (&(l)->a)) | |
41 | #define local64_add_return(i, l) local_add_return((i), (&(l)->a)) | |
42 | #define local64_sub_return(i, l) local_sub_return((i), (&(l)->a)) | |
43 | #define local64_inc_return(l) local_inc_return(&(l)->a) | |
44 | ||
45 | #define local64_cmpxchg(l, o, n) local_cmpxchg((&(l)->a), (o), (n)) | |
46 | #define local64_xchg(l, n) local_xchg((&(l)->a), (n)) | |
47 | #define local64_add_unless(l, _a, u) local_add_unless((&(l)->a), (_a), (u)) | |
48 | #define local64_inc_not_zero(l) local_inc_not_zero(&(l)->a) | |
49 | ||
50 | /* Non-atomic variants, ie. preemption disabled and won't be touched | |
51 | * in interrupt, etc. Some archs can optimize this case well. */ | |
52 | #define __local64_inc(l) local64_set((l), local64_read(l) + 1) | |
53 | #define __local64_dec(l) local64_set((l), local64_read(l) - 1) | |
54 | #define __local64_add(i,l) local64_set((l), local64_read(l) + (i)) | |
55 | #define __local64_sub(i,l) local64_set((l), local64_read(l) - (i)) | |
56 | ||
57 | #else /* BITS_PER_LONG != 64 */ | |
58 | ||
60063497 | 59 | #include <linux/atomic.h> |
1996bda2 PZ |
60 | |
61 | /* Don't use typedef: don't want them to be mixed with atomic_t's. */ | |
62 | typedef struct { | |
63 | atomic64_t a; | |
64 | } local64_t; | |
65 | ||
66 | #define LOCAL64_INIT(i) { ATOMIC_LONG_INIT(i) } | |
67 | ||
68 | #define local64_read(l) atomic64_read(&(l)->a) | |
69 | #define local64_set(l,i) atomic64_set((&(l)->a),(i)) | |
70 | #define local64_inc(l) atomic64_inc(&(l)->a) | |
71 | #define local64_dec(l) atomic64_dec(&(l)->a) | |
72 | #define local64_add(i,l) atomic64_add((i),(&(l)->a)) | |
73 | #define local64_sub(i,l) atomic64_sub((i),(&(l)->a)) | |
74 | ||
75 | #define local64_sub_and_test(i, l) atomic64_sub_and_test((i), (&(l)->a)) | |
76 | #define local64_dec_and_test(l) atomic64_dec_and_test(&(l)->a) | |
77 | #define local64_inc_and_test(l) atomic64_inc_and_test(&(l)->a) | |
78 | #define local64_add_negative(i, l) atomic64_add_negative((i), (&(l)->a)) | |
79 | #define local64_add_return(i, l) atomic64_add_return((i), (&(l)->a)) | |
80 | #define local64_sub_return(i, l) atomic64_sub_return((i), (&(l)->a)) | |
81 | #define local64_inc_return(l) atomic64_inc_return(&(l)->a) | |
82 | ||
83 | #define local64_cmpxchg(l, o, n) atomic64_cmpxchg((&(l)->a), (o), (n)) | |
84 | #define local64_xchg(l, n) atomic64_xchg((&(l)->a), (n)) | |
85 | #define local64_add_unless(l, _a, u) atomic64_add_unless((&(l)->a), (_a), (u)) | |
86 | #define local64_inc_not_zero(l) atomic64_inc_not_zero(&(l)->a) | |
87 | ||
88 | /* Non-atomic variants, ie. preemption disabled and won't be touched | |
89 | * in interrupt, etc. Some archs can optimize this case well. */ | |
90 | #define __local64_inc(l) local64_set((l), local64_read(l) + 1) | |
91 | #define __local64_dec(l) local64_set((l), local64_read(l) - 1) | |
92 | #define __local64_add(i,l) local64_set((l), local64_read(l) + (i)) | |
93 | #define __local64_sub(i,l) local64_set((l), local64_read(l) - (i)) | |
94 | ||
95 | #endif /* BITS_PER_LONG != 64 */ | |
96 | ||
97 | #endif /* _ASM_GENERIC_LOCAL64_H */ |