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
|
#ifndef _ARCH_I386_LOCAL_H
#define _ARCH_I386_LOCAL_H
#include <linux/percpu.h>
typedef struct
{
volatile unsigned long counter;
} local_t;
#define LOCAL_INIT(i) { (i) }
#define local_read(v) ((v)->counter)
#define local_set(v,i) (((v)->counter) = (i))
static __inline__ void local_inc(local_t *v)
{
__asm__ __volatile__(
"incl %0"
:"=m" (v->counter)
:"m" (v->counter));
}
static __inline__ void local_dec(local_t *v)
{
__asm__ __volatile__(
"decl %0"
:"=m" (v->counter)
:"m" (v->counter));
}
static __inline__ void local_add(unsigned long i, local_t *v)
{
__asm__ __volatile__(
"addl %1,%0"
:"=m" (v->counter)
:"ir" (i), "m" (v->counter));
}
static __inline__ void local_sub(unsigned long i, local_t *v)
{
__asm__ __volatile__(
"subl %1,%0"
:"=m" (v->counter)
:"ir" (i), "m" (v->counter));
}
/* On x86, these are no better than the atomic variants. */
#define __local_inc(l) local_inc(l)
#define __local_dec(l) local_dec(l)
#define __local_add(i,l) local_add((i),(l))
#define __local_sub(i,l) local_sub((i),(l))
/* 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 cpu_local_read(v) local_read(&__get_cpu_var(v))
#define cpu_local_set(v, i) local_set(&__get_cpu_var(v), (i))
#define cpu_local_inc(v) local_inc(&__get_cpu_var(v))
#define cpu_local_dec(v) local_dec(&__get_cpu_var(v))
#define cpu_local_add(i, v) local_add((i), &__get_cpu_var(v))
#define cpu_local_sub(i, v) local_sub((i), &__get_cpu_var(v))
#define __cpu_local_inc(v) cpu_local_inc(v)
#define __cpu_local_dec(v) cpu_local_dec(v)
#define __cpu_local_add(i, v) cpu_local_add((i), (v))
#define __cpu_local_sub(i, v) cpu_local_sub((i), (v))
#endif /* _ARCH_I386_LOCAL_H */
|
