1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#ifndef _ARCH_LOONGARCH_LOCAL_H
#define _ARCH_LOONGARCH_LOCAL_H
#include <linux/percpu.h>
#include <linux/bitops.h>
#include <linux/atomic.h>
#include <asm/cmpxchg.h>
typedef struct {
atomic_long_t a;
} local_t;
#define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) }
#define local_read(l) atomic_long_read(&(l)->a)
#define local_set(l, i) atomic_long_set(&(l)->a, (i))
#define local_add(i, l) atomic_long_add((i), (&(l)->a))
#define local_sub(i, l) atomic_long_sub((i), (&(l)->a))
#define local_inc(l) atomic_long_inc(&(l)->a)
#define local_dec(l) atomic_long_dec(&(l)->a)
/*
* Same as above, but return the result value
*/
static inline long local_add_return(long i, local_t *l)
{
unsigned long result;
__asm__ __volatile__(
" " __AMADD " %1, %2, %0 \n"
: "+ZB" (l->a.counter), "=&r" (result)
: "r" (i)
: "memory");
result = result + i;
return result;
}
static inline long local_sub_return(long i, local_t *l)
{
unsigned long result;
__asm__ __volatile__(
" " __AMADD "%1, %2, %0 \n"
: "+ZB" (l->a.counter), "=&r" (result)
: "r" (-i)
: "memory");
result = result - i;
return result;
}
static inline long local_cmpxchg(local_t *l, long old, long new)
{
return cmpxchg_local(&l->a.counter, old, new);
}
static inline bool local_try_cmpxchg(local_t *l, long *old, long new)
{
typeof(l->a.counter) *__old = (typeof(l->a.counter) *) old;
return try_cmpxchg_local(&l->a.counter, __old, new);
}
#define local_xchg(l, n) (atomic_long_xchg((&(l)->a), (n)))
/**
* local_add_unless - add unless the number is a given value
* @l: pointer of type local_t
* @a: the amount to add to l...
* @u: ...unless l is equal to u.
*
* Atomically adds @a to @l, so long as it was not @u.
* Returns non-zero if @l was not @u, and zero otherwise.
*/
#define local_add_unless(l, a, u) \
({ \
long c, old; \
c = local_read(l); \
while (c != (u) && (old = local_cmpxchg((l), c, c + (a))) != c) \
c = old; \
c != (u); \
})
#define local_inc_not_zero(l) local_add_unless((l), 1, 0)
#define local_dec_return(l) local_sub_return(1, (l))
#define local_inc_return(l) local_add_return(1, (l))
/*
* local_sub_and_test - subtract value from variable and test result
* @i: integer value to subtract
* @l: pointer of type local_t
*
* Atomically subtracts @i from @l and returns
* true if the result is zero, or false for all
* other cases.
*/
#define local_sub_and_test(i, l) (local_sub_return((i), (l)) == 0)
/*
* local_inc_and_test - increment and test
* @l: pointer of type local_t
*
* Atomically increments @l by 1
* and returns true if the result is zero, or false for all
* other cases.
*/
#define local_inc_and_test(l) (local_inc_return(l) == 0)
/*
* local_dec_and_test - decrement by 1 and test
* @l: pointer of type local_t
*
* Atomically decrements @l by 1 and
* returns true if the result is 0, or false for all other
* cases.
*/
#define local_dec_and_test(l) (local_sub_return(1, (l)) == 0)
/*
* local_add_negative - add and test if negative
* @l: pointer of type local_t
* @i: integer value to add
*
* Atomically adds @i to @l and returns true
* if the result is negative, or false when
* result is greater than or equal to zero.
*/
#define local_add_negative(i, l) (local_add_return(i, (l)) < 0)
/* Use these for per-cpu local_t variables: on some archs they are
* much more efficient than these naive implementations. Note they take
* a variable, not an address.
*/
#define __local_inc(l) ((l)->a.counter++)
#define __local_dec(l) ((l)->a.counter++)
#define __local_add(i, l) ((l)->a.counter += (i))
#define __local_sub(i, l) ((l)->a.counter -= (i))
#endif /* _ARCH_LOONGARCH_LOCAL_H */
|
