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1#ifndef _ASM_GENERIC_PERCPU_H_
2#define _ASM_GENERIC_PERCPU_H_
3#include <linux/compiler.h>
4#include <linux/threads.h>
5
6#define __GENERIC_PER_CPU
7#ifdef CONFIG_SMP
8
9extern unsigned long __per_cpu_offset[NR_CPUS];
10
11#define per_cpu_offset(x) (__per_cpu_offset[x])
12
13/* Separate out the type, so (int[3], foo) works. */
14#define DEFINE_PER_CPU(type, name) \
15 __attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name
16
17#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
18 __attribute__((__section__(".data.percpu.shared_aligned"))) \
19 __typeof__(type) per_cpu__##name \
20 ____cacheline_aligned_in_smp
21
22/* var is in discarded region: offset to particular copy we want */
23#define per_cpu(var, cpu) (*({ \
24 extern int simple_identifier_##var(void); \
25 RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]); }))
26#define __get_cpu_var(var) per_cpu(var, smp_processor_id())
27#define __raw_get_cpu_var(var) per_cpu(var, raw_smp_processor_id())
28
29/* A macro to avoid #include hell... */
30#define percpu_modcopy(pcpudst, src, size) \
31do { \
32 unsigned int __i; \
33 for_each_possible_cpu(__i) \
34 memcpy((pcpudst)+__per_cpu_offset[__i], \
35 (src), (size)); \
36} while (0)
37#else /* ! SMP */
38
39#define DEFINE_PER_CPU(type, name) \
40 __typeof__(type) per_cpu__##name
41
42#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
43 DEFINE_PER_CPU(type, name)
44
45#define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var))
46#define __get_cpu_var(var) per_cpu__##var
47#define __raw_get_cpu_var(var) per_cpu__##var
48
49#endif /* SMP */
50
51#define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
52
53#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
54#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
55
56#endif /* _ASM_GENERIC_PERCPU_H_ */